The research being conducted and the media for sharing findings change through time. In the past decade, these changes have been particularly rapid, as the technology available for measuring the world and for publishing papers have each gone through multiple step changes. Thejournal is adapting to these changes in service of our research community. This Journal News section of the blog is intended to communicate these adaptations to maintain a leading quality outlet for your work.
All changes at the Journal of Biogeography will reflect our commitment to continually (1) keep pace with and lead advances in the discipline, (2) deliver a constructive, productive process for publishing your biogeographical studies, (3) enhance value to the community, such as replication and reuse of your work, and (4) add value to you by widely disseminating your research to a global audience.
The Journal of Biogeography aims to support early career researchers by highlighting their recently published journal articles and providing a space where the community can get to know the authors behind the works and learn from their publication experiences. In our featured posts, researchers dive into the motivations, challenges, and highlights behind their recent papers, and give us a sense of the broader scientific interests that drive their biogeographic research. This is where we also get a sneak peek into novel and interesting research that is yet to come!
Based on the information provided when manuscripts are submitted, the editorial team will routinely contact authors each month to invite a contribution from those who are both (1) early career researchers, i.e. up to and including postdocs, and (2) corresponding author on their upcoming publication in Journal of Biogeography. However, we also welcome contributions from other early career researchers who may be first or middle authors on these papers; if the study has multiple authors, we very much welcome a single submission from the cadre of early career co-authors involved.
To keep the process simple for all involved, we invite contributions to follow a standard format (see below). Responses need not be given to all prompts, but there should be a critical mass of responses to be informative; responses to prompts that are answered should be concise; thus the experience is streamlined, personalized, and easy.
We encourage a tone and standard suitable for social media and that conveys the excitement and intrigue of being a biogeographer. Previous submissions can provide a guide for your own individualized entries. The social media editors are happy to provide feedback and assistance in revising content before posting. The senior editorial team approves all posts.
If you have any questions or would like to submit your own contribution, please contact one of our social media editors: Dr. Leanne Phelps and Dr. Joshua Thia using the journal’s gmail address, email@example.com. To help you get started, the questionnaire is provided below. Check out recent contributions for examples and ideas!
Links to social media and/or personal website(s)
Current academic life stage (Honours, Masters, PhD, Postdoc?)
Major research themes and interests
Current study species/system? What makes it interesting (/cool!)? (100 words)
Recent paper in Journal of Biogeography (citation)
Describe the motivation behind this recent paper (100–150 words)
Describe the key methodologies in this recent paper, highlighting anything particularly novel or ingenious and how this provides new insights (100–150 words)
Describe any unexpected outcomes of this research, or any challenges you and your coauthors experienced and overcame along the way (100–150 words)
Describe the major result of this recent paper and its contribution toward the field (100–150 words)
What is the next step in this research? (100 words)
If you could study any organism on Earth, what would it be and why?
Is there anything else you would like to tell us about yourself or your featured research? (Any hidden gems the above questions might have missed?)
If available, please provide three or more visually appealing photos (with captions) that relate to your work, so we can feature you on our social media platforms.
Every month, each new issue of the Journal of Biogeography (JBI) includes at least two highlighted articles—the Editors’ Choice and the paper associated with the cover image—and periodically we highlight a topic with a series of papers as part of a special issue. Our intention on the blog is to communicate additional aspects of these, and other papers published in JBI, from slightly different perspectives.
Every published paper has a story behind it that complements and enriches our understanding of the published science. Very rarely, the parallel narrative might provide as radical a reframing of the entirety of our scientific work as did Thomas Kuhn’s “The Structure of Scientific Revolutions”, Bruno Latour’s study of “Laboratory Life”, and the feminist critique of science by Evelyn Fox Keller, Sandra Harding, Helen Longino, and others. On occasion it may cause us to rethink the history of the discipline and its modern consequences—as in recent works on decolonialization of biogeography—or likewise to consider current approaches and what they may mean for the future. Oftentimes the parallel narrative is simply a personal perspective on how we stumbled upon a particular question, co-opted a tool for a different job, ran into unexpected difficulties or found something easier than anticipated, visited wonderful places, worked with fascinating organisms and systems, became aware of related challenges, saw something on the side that sparked our curiosity for the next study, and so on.
Irrespective of what your story is, these pages are intended to provide a small window onto that complimentary narrative that details the human endeavor of biogeography. The idea is to try to demystify how the polished published biogeographical story emerges from at times complicated studies of a complex world. No matter what our career stage, each study comes with its challenges, the solutions merit acknowledgement (and can potentially help others), and each publication is an achievement to be celebrated. In recognizing these commonalities, we hope the diversity of routes and strategies for publishing become a little more transparent and a little more accessible to all.
The format for highlighting papers is flexible (within a limit of ~750 words [+/- 250]), but we provide a few optional prompts below to get you started and make sure some key information is available.
Format & some optional prompts:
Title for blog post
Author name, title, institutional details
Links to social media and/or personal website(s)
Citation including URL for recent paper in Journal of Biogeography
Describe the motivation behind this recent paper. — What’re the major research themes and interests it addresses? — What makes it interesting/cool/important? — What surprised you / the team while designing, conducting, completing the study? What knotty problem did you have to overcome? — Reflecting on the whole process, beyond the published research, what were other important outcomes from the project? — Where do you / the team go from here? — Is there anything else you would like to tell us (any hidden gems the prompts might have missed)? — Two to three visually appealing photos/images (with captions) that relate to the work and this narrative is possible.
Katie is a postdoc at the University of Kentucky. She combines phylogenetics and phylogeography to understand species diversity and distributions. Katie shares her recent work on patterns of co-distributed genetic structure among 25 small-bodied animals (tenrecs, rodents, and reptiles) from Madagascar’s highland regions.
Institute. University of Kentucky, Department of Biology
Academic life stage. Postdoc
Major research themes. I’m driven by three major questions: how many species exist in a given lineage (species delimitation), how are those species related (phylogenetics), and which landscape features have shaped their evolutionary history (phylogeography)? I think the best avenue for exploring these topics is to blend traditional museum-based systematics with genomic datasets.
Current study system. Most of my research is focused on Madagascar’s mammals. The island of Madagascar is a biodiversity hotspot and 100% of its native terrestrial mammals are found nowhere else on Earth. Even though Madagascar is well known among biologists, many of its species have not been described in the scientific literature, and researchers still don’t fully understand how and why the island’s biodiversity arose. Describing this biodiversity and its evolutionary history is urgently important as Madagascar’s forest habitats are quickly disappearing.
Recent paper in JBI. Everson, KM, Jansa, SA, Goodman, SM, Olson, LE. Montane regions shape patterns of diversification in small mammals and reptiles from Madagascar’s moist evergreen forest. Journal of Biogeography. 2020; 47: 2059– 2072. https://doi.org/10.1111/jbi.13945
Motivation for this work. This paper has been a long time in the making! The original idea came from my PhD advisor Dr. Link Olson (University of Alaska Museum) who studied Madagascar’s tenrecs, and his friend and colleague Dr. Sharon Jansa (University of Minnesota) who studied Madagascar’s native rodents. In the early 2000s, Link and Sharon had each been looking at some mitochondrial data from museum specimens when they realized that many species had very similar phylogeographic patterns. Specifically, when they looked at the eastern humid forest, they saw that many species are co-distributed and have a nearly identical population structure. This made them wonder if the same geological features could be driving population structure across multiple species. They teamed up with Dr. Steve Goodman (Field Museum and Association Vahatra), who brought a wealth of on-the-ground knowledge and experience in the eastern humid forest, and me, who brought the skillset for comparative phylogeographic analyses and a fresh perspective.
(left) Katie Everson checking pitfall traps in Madagascar’s moist evergreen forest near Betampona Reserve. (Photo credit: Link Olson) (right) Leaf-tailed geckos (genus Uroplatus) are endemic to Madagascar and occur broadly in the moist evergreen forests. (Photo credit: Katie Everson)
Key methodologies. This was a comparative phylogeographic study – we used genetic and geographic data from 25 species (13 tenrecs, 7 rodents, and 5 reptiles) to identify similarities in population structure. This approach assumes that if multiple species share the same phylogeographic break – say, across a river – then that river has probably been an important feature driving diversification. We were surprised to find that 24 out of our 25 species shared phylogeographic breaks between Madagascar’s highland regions, so we concluded that the highlands have played an important role in driving diversification on Madagascar.
Any challenges? We ran into a few roadblocks while working on this paper, but we’re glad that we were ultimately able to overcome them all! One big challenge was dealing with ever-changing taxonomy in this biodiversity hotspot. While we were working on this research, several papers were published suggesting that at least 6 of our focal species should actually be split into multiple species. We debated whether we needed to remove those groups from our study, but in the end we decided to move forward and treat everything as a “species complex.” We also added a new analysis to test whether any of our other 19 species also contained hidden diversity (spoiler alert: they all did!).
Major results. We found that the Madagascan highlands have played an important role in structuring genetic diversity on Madagascar. This finding represents a new phylogeographic model for Madagascar that we hope will be used by future scientists as a jumping point to explore new hypotheses. We also identified 85 deeply divergent lineages that may represent new (i.e., unrecognized or cryptic) species, which corroborates other findings that Madagascar’s species-level biodiversity is vastly underestimated. On the whole, our work shows that Madagascar’s distinctive fauna is continuing to diversify, and it shows that the highlands might be a key to explaining how Madagascar became one of the world’s foremost biodiversity hotspots.
Shrew tenrecs (genus Microgale) are endemic to Madagascar. They featured prominently in this study. (Photo credit: Jonathan Fiely)
Nest steps. It would be interesting to add other species besides small-bodied vertebrates to see whether the Madagascan highlands have played an important role for diversification of other groups like lemurs, plants, or insects. It would also be great to collect a bigger genetic (or maybe even genomic?) dataset. With more data we would have the power to explore divergence times, patterns of gene flow, and other fine-scale aspects of demographic history. Finally, this study illuminated the presence of potential new species and pointed to important, previously unrecognized regions of microendemism. I think it will be important to follow up on these on a case-by-case basis.
If you could study any organism on Earth, what would it be? That’s a hard question! I love studying Madagascar’s mammals, but I know there are a lot of other groups that would be interesting to study too. One that comes to mind are the pangolins. They’re the most trafficked mammals in the world, they carry a coronavirus that is very similar to human COVID-19, and they have a really interesting distribution from Africa to the islands of Southeast Asia. Plus, they look like something from another planet – the way they walk is so funny!
Anything else to add? I want to emphasize that obtaining all of the samples for this research was an enormous collecting effort, both by my coauthors and by numerous Malagasy researchers over the last several decades. I feel very fortunate to have been able to work with these samples!
Local biological diversity, also known as alpha diversity, has three different components: the number of species in a given area (taxonomic diversity), the number of distinct traits that these species have (functional diversity) and their evolutionary distinctiveness (phylogenetic diversity). The relationships among these components of diversity vary across geography reflecting the differences in eco-evolutionary processes among distant regions.
(Above) 3D visualization of the empirical relationships between functional diversity, phylogenetic diversity and taxonomic diversity for amphibians in the Continental Americas based on our theoretical framework.
This study was motivated by the fact that different components of biological diversity have been shown to vary slightly in their geographical distribution: while species richness, phylogenetic diversity and functional diversity are broadly correlated, there are some regions where one measure of diversity is higher or lower than expected based on the others.
FROM THE COVER: Ochoa-Ochoa, LM, Mejía-Domínguez, NR, Velasco, JA, Dimitrov, D, Marske, KA. Dimensions of amphibian alpha diversity in the New World. J Biogeogr. 2020; 47: 2293– 2302. https://doi.org/10.1111/jbi.13948
We discussed extensively the possibilities to integrate these three dimensions of biological diversity in a single framework and developed a set of hypotheses about the potential drivers of variability in the relationships among the diversities. We then mapped the spatial distribution of these diversity measurements and use our theoretical framework to explore the processes that may have generated the spatial patterns of amphibian diversity in the New World as we know it today.
. Quilticohyla zoque is a treefrog species from the family Hylidae from Nahá reserve, Chiapas, Mexico. Photo: LMMO.
We found that although the three aspects of diversity showed similar patterns, the geographical variation in the relationship between diversities suggested that a variety of processes, including ecological opportunity, habitat filtering, competitive interactions, among others have had different impacts on the different components of diversity. We also found regional differences dominant processes shaping diversity patterns.
Finally, we concluded that neither dimension of amphibian alpha diversity is a general predictor for other dimensions. Thus a single explanation about ecological and evolutionary processes underlying geographical variation in amphibian diversity is not possible. Our findings have major implications for conservation because setting conservation priorities may require analyses to determine which is the most important dimension of diversity to be conserved. Thus, the question of whether to give priority to history (e.g., antique lineages, evolutionary uniqueness), to high functional diversity (with rare or unique functions) or to taxonomic diversity (number of species) is critical.
. Rhinophrynus dorsalis, is a Mexican burrowing toad from the family Rhinophrynidae from Nahá reserve, Chiapas, Mexico. Photo: LMMO.
Ideally, if we want to preserve a wider range of the evolutionary spectrum, the aim should be, not only to conserve as many species as possible, but also to conserve a broad selection of different phylogenetic lineages and life history traits (functions). We expect that our findings will stimulate a new generation of local studies aimed at deciphering how diversity in ecological roles, evolutionary heritage and species numbers was assembled by ecological and evolutionary processes at finer spatial scales.
Written by: Leticia Margarita Ochoa-Ochoa, Full Professor, Evolutionary Biology Department, Museum of Zoology, Faculty of Sciences, UNAM. Nancy R. Mejía-Domínguez, Associated Researcher, Unidad de Bioinformática, Bioestadística y Biología Computacional, Red de Apoyo a la Investigación (RAI). Coordinación de la Investigación Científica, UNAM. Julian A. Velasco, Associated Researcher, Centro de Ciencias de la Atmósfera, UNAM. Dimitar Dimitrov, Associate Professor, Department of Natural History, University Museum of Bergen, University of Bergen, Bergen, Norway. Katharine A. Marske, Assistant Professor, Geographical Ecology Group, Department of Biology, University of Oklahoma, Norman, Oklahoma, USA
An increased awareness of systemic bias in institutions requires that we all examine the practices in which we participate. Around the turn of 2020, the Journal of Biogeography (JBI) began considering initiatives to promote opportunities for researchers currently underrepresented in biogeography, a discussion that continued throughout the year, and will go on for some time yet. A key part of this discussion is transparency in the current state of imbalance, inequity, and exclusion and changes in their status through time to hold ourselves accountable and ensure we are making progress. By way of this post, we begin this process of transparency and accountability, with JBI‘s first Annual Report on Equity, Diversity, and Inclusion.
Approach & results for 2020: There are many dimensions to diversity, and currently we are able to access information on only a subset of these, with some degree of accuracy, for a subset of roles within the publishing ecosystem. These data come from recent investments by Wiley to understand aspects of gender diversity of authors (currently, absent instruments for self-identification, we are restricted to estimates of binary gender diversity afforded by tools that assign female-male gender on the basis of statistical associations between first names and countries), from our abilities to retrieve geographic diversity in author submissions and publications in ScholarOne and the analytics behind this blog, as well as from a small number of public documents on the journal website and a diversity questionnaire completed by authors of blog posts. As a result, we report on aspects currently accessible and commit to improving our information systems in the coming years.
Associate Editors: Current board composition: 15 women, 42 men. New members added in 2020: 3 women, 2 men. Total new invitations in 2020: 8 women, 4 men. Geographic diversity by institutional location: 25 countries (Argentina 1, Australia 4, Austria 2, Belgium 2, Brazil 2, Chile 1, China 3, Cyprus 1, Denmark 1, Finland 2, France 2, Germany 2, Greece 1, Italy 1, Japan 1, Mexico 2, Netherlands 4, New Zealand 1, Northern Ireland 1, Norway 1, Poland 1, South Africa 4, Spain 2, UK 5, USA 9)
Deputy Editors-in-Chief: Current board composition: 2 women, 3 men. New members added in 2020: 1 man. Geographic diversity by institutional location: 5 countries (France, Germany, Portugal, UK, USA)
Editor-in-Chief: Current board composition: 1, man. Geographic diversity by institutional location: USA
Social Media Editors: WeChat: 1, man. Blog, Facebook, Instagram, Twitter: 1 woman, 1 man. Geographic diversity by institutional location: 3 countries (Australia, China, Switzerland) Cultural/national identity: American, Chinese, Chinese-European.
Editorial Academy: Current board composition: 3 women, 3 men. New members added in 2020: 3 women, 3 men. Total new invitations in 2020: 3 women, 3 men. Geographic diversity by institutional location: 4 countries (Finland, Germany 2, UK 2, USA) Cultural/national identity: China, Germany, Portugal (2), New Zealand, United Kingdom.
Submitting first authors: 27% women Submitting corresponding authors: 26% women Submitting authors: 25% women
Published first authors: 28% women Published corresponding authors: 24% women Published authors: 26% women
. (Above) The geographic sources, by lead author institute, of papers published in JBI between September 2019-2020 (v.46 issues 9-12 and v.47 issues 1-9).
In 2020, JBI introduced three initiatives to advance principles consistent with the journal’s Equity, Diversity & Inclusion statement (see “Other” below).
Editorial Academy: See above.
Small Grants for Global Colloquia in Biogeography: In progress (to be reported in 2021).
JBI Awards for Innovation: In progress (to be reported in 2021).
Early Career Researcher features (as of 18 Oct 2020): 10 women, 10 men 4 PhD, 15 postdoc, 1 other [postdoc equivalent]
Readership: 153 countries (United States, Brazil, Germany, United Kingdom, India, Australia, Canada, Spain, France, China, Mexico, Netherlands, Italy, Switzerland, New Zealand, Sweden, Norway, Colombia, Japan, South Africa, Portugal, Chile, Austria, Argentina, Denmark, Belgium, Finland, Taiwan, Singapore, South Korea, Poland, Israel, Czech Republic, Nepal, Ireland, Hong Kong SAR China, Greece, Turkey, Peru, Pakistan, Indonesia, Ecuador, Thailand, Costa Rica, Philippines, Romania, Croatia, Nigeria, Russia, Malaysia, Bangladesh, Hungary, Estonia, Saudi Arabia, Benin, Kenya, Uruguay, European Union, Slovenia, Lebanon, Sri Lanka, Guatemala, Venezuela, Algeria, Slovakia, Iceland, Cyprus, Serbia, Egypt, Ghana, Morocco, Panama, Vietnam, Papua New Guinea, Lithuania, Bolivia, Cuba, Bulgaria, Kazakhstan, New Caledonia, Luxembourg, Puerto Rico, Ukraine, Uganda, Mozambique, Paraguay, Sudan, United Arab Emirates, Tanzania, Faroe Islands, Congo – Kinshasa, Gambia, Réunion, Oman, Honduras, Montenegro, Kuwait, Latvia, Bosnia & Herzegovina, Qatar, Namibia, Zimbabwe, American Samoa, Cambodia, Macau SAR China, Myanmar, Tunisia, Côte d’Ivoire, Albania, Madagascar, Zambia, Malta, Iraq, Palestinian Territories, Congo – Brazzaville, Burkina Faso, Burundi, Rwanda, Uzbekistan, El Salvador, Dominican Republic, Nicaragua, Jordan, Mongolia, Curaçao, Belarus, Ethiopia, Syria, Seychelles, Cameroon, Guyana, Monaco, Botswana, Barbados, Azerbaijan, Macedonia, Jamaica, Moldova, Afghanistan, Laos, Martinique, Armenia, Togo, Libya, Bhutan, Bermuda, Senegal, Angola, French Polynesia, Brunei, Maldives, Guam, Equatorial Guinea).
(Left) Number of page views of the JBI blog by country since inception, early January 2020. (Right) Number of page views of the blog by country for the month ending 18 October 2020 shows potential for individual blog posts to reach audiences in usually underrepresented countries, in this case Nepal.
Like other journals, including Oikos, we consider diversifying biogeography to be integral with the future of biogeography, so JBI adopted Equity, Diversity & Inclusion statements at the beginning of July 2020. The statements can be found here and here (Section 5, bottom) and are designed specifically to address the need for inclusion to start with the earliest planning stages of research. A version of this statement also is included in JBI‘s initiatives (see above) that are explicitly intended to promote gender and geographic diversity among early career biogeographers.
Wiley is a signatory of the Joint Commitment for Action on Inclusion and Diversity in Publishing. link
Action items for 2021:
Growing from these initial data and experiences over the past year, we identify several goals on which we aim to work in the coming year. We do not consider this a complete list, nor a list of all that needs to be done. Goals for 2021 include:
To partner with other journals and societies on this matter, particularly sponsoring a discussion / session at an upcoming meeting. Two ideas in this regard are: – “Women in biogeography” – “Island biogeography from the perspective of indigenous islanders”
To increase geographic diversity among all of the journal’s constituencies: authors, editors, readers, reviewers.*
To increase gender diversity in leadership positions while being sensitive to workload.
To achieve gender parity and geographic representation in initiatives.
To increase gender diversity of authors, which in biogeography lags other ‘ecology’ titles (see figure below).
To begin a series of special or virtual issues focusing on diversity in biogeography. The first contribution will be 1 of ≥2 virtual issues on “Women in Biogeography” which we hope to publish later this year.
To implement a framework for better assessing diversity in submission and publication, such as improved analytics of manuscript metadata and post-decision information gathering from all authors.
Likewise, to implement a framework for assessing diversity in invitations to review cf. acceptances and submissions of reviews (see partial data in figure below).
To be responsive to Wiley’s recently formed DE&I advisory board which is creating a framework that could be applied to numerous journals across disciplines.
*In the current report, geographic location of current institution is used as one dimension of geographic diversity in biogeography for which data currently are accessible. Action items for 2021 (above) include developing infrastructure for understanding ethnicity, nationality, cultural identify, country of origin.
. (Above) Proportion of women in various roles in JBI relative to other Wiley ecology journals, 2019. While there is no substantial bias in acceptance rates (middle) relative to submission rates (top) at JBI, the journal has a lower proportion of female authors and reviewers than is average across ecology journals in general.
Raquel is a postdoc at the Museo Nacional de Ciencias Naturales, Spain. She is a biogeographer and macroecologist with an interest in migratory birds. Raquel shares her recent work on historical shifts in the migratory behaviour of bird species that undergo Euro-African migrations.
Institute. Museo Nacional de Ciencias Naturales (CSIC)
Academic life stage. Postdoc.
Major research themes. Macroecology, birds, biogeography, migration, islands.
Current study system. I am interested in all groups of birds. During my PhD, I studied birds that migrate from Africa to Eurasia. The fascinating thing about them is that they not only perform journeys of thousands of kilometres but also face extreme conditions during their journey (like crossing the Sahara desert). There is a great diversity of migratory Euro-African species, making them ideal to understand general behavioural patterns in birds. Currently, I am broadening my interests towards island biogeography and diversification in birds.
Motivation for this paper. Current and past climatic changes have shaped bird distributions and migratory behaviours. Migratory behaviour can shift to sedentary behaviour relatively quickly during the evolutionary history of birds. In this context, some hypotheses suggest that North American birds stopped migrating during glaciations, remaining sedentary in their wintering grounds, and regaining their migratory behaviour in warmer periods. We wanted to test this hypothesis for Euro-African migratory birds, as the geography of both continents are different from the Americas.
A White stork (Ciconia ciconia)during thebreeding season in Lombardia (Italy). Photo: Marco Sannolo
Key methodologies. In this study, we used species distribution models to infer present and past breeding and wintering distribution of every Euro-African migratory bird species. We created maps of probability of occurrence for the present and the Last Glacial Maximum based on the climate that species currently experience in their breeding and wintering distributions. If we know which climatic conditions birds face in the present, we can infer where in Europe or Africa these conditions might have occurred in the past. We evaluated the differences between present and past distributions and measured the distances between both breeding and wintering ranges. We predicted that breeding and wintering distributions would overlap if there had been a change in migratory behaviour to sedentary status during glaciation events. We also reviewed the bird fossil record from the Plio-Pleistocene covering Europe and Africa. This provided us an independent corroboration of our models.
Major results. We found that bird migratory species did not stop migrating during the glacial periods of the Pleistocene. Euro-African migratory birds reduced their migratory distances, as part of the north Hemisphere were covered by ice. However, unlike American migratory birds, Euro-African birds continued migrating, remaining in the Mediterranean basin during the breeding season and crossing the Sahara belt until their wintering areas. This finding indicates that the geography of the continents may play an important role in the evolution of migratory behaviour, and that current migratory routes probably were established during the Pleistocene or before (at least the Eurasian-African flyways).
An Egyptian vulture (Neophron percnopterus) during the breeding in August in the “Hoces del Duratón” Natural Park in Segovia (Spain). Photo: Marco Sannolo
Challenges of this research. Making conclusions with climatic based modelling is challenging because the models offer us a view of how species could distribute if they followed the same climatic conditions as in the present time. However, we cannot be sure how conditions were in the past nor how species were distributed. Therefore, to study historical processes we had to make assumptions and provide a plausible explanation considering the reduced evidence of fossils. In our case, we chose to create a climatic envelop considering only the climate of the months of the breeding and wintering season, but we did not know how long breeding and wintering seasons were in the past. Hence, we created plausible average breeding and wintering seasons for all species, assuming that this season would not substantially differ from the actual ones.
Next steps. This study opens further questions about the lability of migratory behaviour under climatic changes. Given the current climate change scenario, we wonder how birds will respond to an increase of temperatures or intermittent droughts. We are interested in determining if migratory birds will change their migratory behaviour and increase their migratory distance. Furthermore, we also want to study the effect of global change in migratory arctic-bird distributions, such as shorebirds, which breed in very high latitudes and could not further change their breeding distributions to northern areas. The first step to answer these questions could be modelling bird distributions under possible global change scenarios and evaluating the distributional changes compared with the present.
If you could study any organism on Earth, what would it be? I would love to expand my research towards endemic birds from islands and their evolution and adaptation to new environments. In one of my studies, I found that almost all migratory species and subspecies that colonize an island remain sedentary and greatly change their morphological features. This opened me a new world that I would like to develop in the future. Although I mostly study bird species, I am also interested in other groups, like reptiles. If I had the opportunity to develop new research focused on biogeography and macroecology I would not say no to include other groups!
The Journal of Biogeography is pleased to announce the third of three new opportunities for Early Career Researchers: the Journal of Biogeography Innovation Awards.
The Journal of Biogeography invites submissions of manuscript proposals (brief outlines of manuscripts yet to be prepared) by Early Career Researchers for consideration for publication and awards for innovation.
Proposals will be considered in three categories of article: – Perspectives and Syntheses – Original research – Methods
Proposals on any subject in biogeography are welcome. We particularly encourage studies in the following areas: Biodiversity–geodiversity; Comparative phylogeography and geo-genomics; Functional biogeography; Cross-scale biogeography & biodiversity (considering biological, spatial, and/or temporal hierarchies); Marine-terrestrial comparisons and contrasts (also with aerial, freshwater, and subterranean realms); Biogeography in the Anthropocene; New technologies; Interdisciplinary biogeography.
Proposals should be composed of the following and submitted as a single PDF: – Title – Targeted article type (see above) – ≤600 word proposal organized under the following headings: .. The gap in knowledge/understanding to be addressed .. The context (incl. a brief review of the relevant literature) .. Goal or expected outcomes .. Significance – List of authors (indicate the eligible ECR, who must be lead and corresponding author) – Contact information for the eligible ECR – Date the eligible ECR’s degree was conferred
Early Career Researchers are graduate students and postdocs (and equivalent positions) up to 5-years post award of the PhD (exclusive of career breaks).
All proposals will be reviewed by an ad hoc committee of JBI academy, associate and chief editors on the following criteria:
Novelty / originality of the idea (30%)
Accuracy of identified problem and context (30%)
Significance / impact (20%)
Quality of preparation (20%)
Up to a dozen proposals in each category will be invited for submission as full articles, which should be submitted within 3 months of receiving the invitation.
Full articles will enter the standard editorial and review procedure of the journal and will be assessed for receipt of the award on the following criteria:
Novelty / originality of the idea
Accuracy of identified problem and context
Significance / impact of findings
Quality of preparation of the manuscript
Journal of Biogeography will publish all invited articles freely under “full access” (i.e. downloadable from the journal website for one year from the date of publication). In addition, the lead ECR authors of the three papers ranked most highly by the editorial team will receive a monetary award of $750 each.
Timeline: Proposal submission: 13 November 2020 Invite full manuscripts: 04 December 2020 Manuscript submission: 01 March 2021
Address enquiries (Subject line: “Enquiry: ECR Innovation Award”) to the Editor-in-Chief at firstname.lastname@example.org
JBI aims to foster inclusive science that reflects the disciplinary, human, and geographic diversity of biogeography and biogeographers. Submissions are welcomed from applicants of all ethnicities, races, colors, religions, sexes, sexual orientations, gender identities, national origins, disabilities, ages, or other individual status.
Mouse-goats, ‘demons of the forest’, and other insular bovids have short and robust limbs. Why? The ‘low gear’ hypothesis had never been tested until we decided to fill this gap with a quantitative investigation of the causal forces influencing the acquisition of this peculiar type of locomotion.
Above: Skulls of a tamaraw (Bubalus mindorensis), a dwarf buffalo endemic to Mindoro island, highlighting different stages of ontogenetic development (Mammal Collection; Field Museum of Natural History, Chicago).
The Dutch palaeontologist P. Y. Sondaar already noticed in the 1970s that many insular ruminants, and to a lesser degree insular elephants and hippopotamuses, exhibited short and robust limbs. He explained this as an adaptation for a peculiar type of gait, that he described and named ‘low gear’ locomotion. Sondaar and other researchers after him mentioned several examples, including the iconic Balearian mouse-goat (Myotragus balearicus). They believed that this stout structure of the limbs would be advantageous, in the absence of predators, for low-speed walking in mountainous environments.
Bovids are intriguing elements of insular faunas and encompass phyletic dwarfs that occurred or are still living on islands located in different regions, from Southeast Asia to the Mediterranean. I have previously investigated their body size evolution on islands, (https://onlinelibrary.wiley.com/doi/full/10.1111/jbi.13197) and we decided to concentrate on the bovid family again in this study. Some of the best-known cases of ‘low gear’ locomotion include the already mentioned Myotragus as well as the tamaraw, a living dwarf buffalo endemic to Mindoro in the Philippines. We focused on the two main morphological traits associated with this peculiar type of gait, that is short and robust metapodials, and we calculated response variables in 21 extinct and living insular bovids. We assembled data on their life history and ecology and on the physiography of 11 islands. We estimated 10 predictors, including 4 topographic indices, and assessed their contextual importance by combining statistical and machine learning methods.
FROM THE COVER: Rozzi, R, Varela, S, Bover, P, Martin, JM. Causal explanations for the evolution of ‘low gear’ locomotion in insular ruminants. J Biogeogr. 2020; 47: 2274– 2285. https://doi.org/10.1111/jbi.13942
We demonstrated that the evolution of ‘low gear’ locomotion in insular ruminants does not result simply from phyletic dwarfing and from the absence or scantiness of predators in the focal communities. Instead, we showed that release from competitors on species-poor islands plays an essential role in prompting adaptations for this peculiar type of gait. While island topography is not as relevant as interspecific dynamics in influencing the evolution of the focal morphological traits, the amount of mountainous terrain occurring on each island seems to significantly affect the evolution of robust metapodials in insular bovids. All in all, our study supports the idea that the evolution of ‘low gear’ locomotion would be the product of a complex interplay of biotic and abiotic factors, and calls for caution in drawing conclusions on this phenomenon on the basis of single, albeit significant cases.
(Left) Roberto measuring a skull of the iconic mouse-goat, Myotragus balearicus, at IMEDEA – Mediterranean Institute for Advanced Studies, Mallorca. M. balearicus was an endemic caprine that lived on Mallorca and Menorca during the Late Pleistocene and Holocene, before becoming extinct following the arrival of humans around 4300 years ago. (Right) Roberto embraced by the horns of a river buffalo, Bubalus bubalis, in the mammal collections at the Smithsonian National Museum of Natural History, Washington DC.
An unexpected outcome of this study was to find out that, even though the most extreme cases of ‘low gear’ locomotion occurred on islands with no mammalian predators, our models did not show a significant relationship with this predictor. To sum up, the a priori hypothesis that this low-speed gait would simply result from predator release on islands needed to be reconsidered. Discussing the role of ecological and topographic traits in influencing the evolution of ‘low gear’ locomotion was challenging, because of their complex interaction and the variation in morphological responses to those factors within insular bovids. In fact, we observed a variety of trait combinations, with species exhibiting different degrees of robustness and shortening of metapodials, and different responses to many of the focal predictors by species belonging to one or the other subfamily of bovids in the study. Thus, much effort is still needed to verify how robust island syndromes are and to understand their causation. In this vein, I am planning to continue to explore other peculiar traits exhibited by these fascinating animals. In particular, I am looking forward to implementing advanced methodologies in palaeoneurology to investigate patterns of brain size variation and changes in the degree of cortical folding in insular Artiodactyla.
More broadly, my research focuses on the evolution and extinction of mammals on islands. There is some urgency to this. In response to the special characteristics of island environments, these animals often undergo fascinating evolutionary changes, including changes in body size and in the morphology of their skull, brain, teeth and limbs. My collaborators and I are currently focusing on how the evolutionary changes undergone by insular mammals predispose them to heightened extinction risk. I am investigating the relationship between their peculiarity and their fragility, as many of these evolutionary marvels are often threatened or already extinct. In collaboration with other palaeontologists, mammalogists and biogeographers, we are integrating data on fossil and living insular mammals to document their extinctions across large scales of time and to inform conservation strategies.
Mounted skeleton of the extinct (Middle Pleistocene) Sicilian dwarf elephant Palaeoloxodon falconeri at Museo Geologico ‘G. G. Gemmellaro’, Palermo, Sicily.
The application of theories and analytical tools of palaeontology to provide valuable information for conservation planning is one of the key drivers of my research. Many threatened island mammals receive scarce conservation action because they are deemed ‘uncharismatic’ and fail to attract funding. Palaeontological studies have the potential to produce detailed information on the evolutionary history and uniqueness of these species and, thus, draw attention to their conservation value. I did my PhD on insular bovids and I was saddened to read that, in a recent study on the full collection of mammals from the Prague Zoo, the lowland anoa (Bubalus depressicornis) was ranked as one of the least attractive species. Sometimes referred to locally as Sulawesi’s ‘demon of the forest’, anoas never cease to inspire my research and, as a member of the IUCN SSC Asian Wild Cattle Specialist Group (https://www.asianwildcattle.org/), I feel it is important to keep highlighting how beautiful and unique these dwarf buffaloes really are.
The evolutionary anomalies of island life are among the most spectacular phenomena in nature, yet islands contain a disproportionately higher amount of threatened and extinct biota compared to continents. I have always found the ecologically naive and fragile nature of these taxa extremely intriguing. Dwarf elephants and hippos, giant rats and shrew-like insectivores larger than a cat, short-legged bovids with stereoscopic vision, deer with bizarre antlers, etc. Both the fossil record and islands today are home to mesmerizing mammal species.
Postdoc, German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig
(Left) View of Monte Tuttavista, one of the major Sardinian localities yielding Quaternary fossil vertebrates ranging in age from the Early to Late Pleistocene. Bovids of the so-called ‘Nesogoral group’ were also recovered from this site and included in our study. (Centre) Roberto Rozzi at Gásadalur, Vágar, Faroe Islands. (Right) Crystal clear waters of Caló den Rafelino, Mallorca, where remains of the earliest representative of the Myotragus lineage were found (Myotragus palomboi; Early Pliocene).
Jonathan Sandoval-Castillo is a postdoc at Flinders University. He is a phylogeographer that integrates molecular and ecological data to study the evolution of elasmobranchs. Jonathan shares his recent work on the cryptic lineages and speciation of guitarfish.
Jonathan sampling elasmobranch tissue from artisanal fisheries. Jonathan visited over 30 artisanal fishery camps around the Gulf of California and the Baja California Peninsula during his PhD fieldwork.
Major research themes. I am attracted to the biogeography, phylogeny, and evolution of marine organisms, especially the speciation process in elasmobranchs (sharks and rays). I am interested in the integration of molecular and ecological approaches to elucidate evolutionary histories in aquatic ecosystems.
I study guitarfish. These fish show an intermediate body shape between sharks and rays, and are a diverse group of elasmobranchs with several species living in sympatry. They are highly abundant and, being predators, they are an important component of coastal benthic ecosystems. In addition, some species have high value meat and are the main component of several artisanal fisheries in developing countries. However, guitarfish are also one of the vertebrate groups most vulnerable to overexploitation. Two main factors constrain their effective management and conservation: a lack of basic biological information and numerous difficulties surrounding proper identification of the species.
Current study system. I study guitarfish. These fish show an intermediate body shape between sharks and rays, and are a diverse group of elasmobranchs with several species living in sympatry. They are highly abundant and, being predators, they are an important component of coastal benthic ecosystems. In addition, some species have high value meat and are the main component of several artisanal fisheries in developing countries. However, guitarfish are also one of the vertebrate groups most vulnerable to overexploitation. Two main factors constrain their effective management and conservation: a lack of basic biological information and numerous difficulties surrounding proper identification of the species.
Recent paper in JBI. Sandoval-Castillo J, Beheregaray LB (2020) Oceanographic heterogeneity influences an ecological radiation in elasmobranchs. Journal of Biogeography 47:1599–1611.https://rdcu.be/b4fuY
Motivation for this paper. Speciation is one of the most important and least understood processes in nature. Most biologists agree that species are fundamental biological units for several ecological and evolutionary processes. However, contention still exists about the definition, delimitation, and origin of species. This challenges the study of processes and mechanisms that create and maintain biodiversity. This is especially true for elasmobranchs. Despite elasmobranchs being a charismatic and highly diverse group of vertebrates, they are underrepresented in the scientific literature and very little has been done to decipher the main mechanisms by which new species of sharks and rays originate. However, because of elasmobranchs’ relatively moderate to high mobility, we expect that ecological isolation plays a major role in their diversification. To test this hypothesis, we selected the guitarfish from the Gulf of California because the group has high diversity in the area. In addition, the Gulf of California has both an active geological history and high oceanographic variability, enabling us to test the relative effect of vicariance events and ecological isolation on diversification of the marine populations inhabiting the region.
A Pseudobatos guitarfish.
Key methodologies. We assessed the role of oceanographic variation in the diversification of guitarfishes (genus Pseudobatos) in the Gulf of California by integrating genetic and environmental datasets. We first used the genetic data (mtDNA sequences and AFLP genotypes) to determine the number of guitarfish lineages present in the Gulf of California and elucidate their phylogenetic relationships. We then combined distribution models and seascape genetic analyses to establish the relative importance of six oceanographic variables that might have affected genetic differentiation between lineages. Finally, we used coalescence models to separate the role of historical geological events from the role of modern oceanographic variation on the diversification of these lineages.
Major results. Our work evidences five distinct lineages of Pseudobatos, with geographic distributions overlapping ecologically discrete bioregions in the studied area. Moreover, genetic differences between lineages are correlated with sharp dissolved oxygen and nutrient concentration gradients between these bioregions. We propose that the bioregions present heterogenous habitat opportunities and a source of divergent selective pressures. These promote metabolic specializations associated with differences in oxygen concentration and diet that together triggered a recent adaptive radiation of Pseudobatos. Our work showcases the role of isolation by environment in generating and maintaining diversity in this group and suggests that mobility might not hinder speciation in sharks and rays. Our study likely represents the first assessment of a recent ecological radiation in elasmobranchs. It also offers a new perspective about the application of integrative approaches to study the effect of divergent selection on biological diversification in the ocean.
The Gulf of California is an excellent system to study biogeography: it has an recent active geological history and high temporal and geographic oceanographic variability (Photos: Israel Sanchez Alcantara).
Unexpected results. We found five distinct lineages of Pseudobatos in the Gulf of California and the Baja California Pacific Coast, including four cryptic lineages. At first, we thought this large number of lineages was a mistake since the 210 samples were identified as just two described species. However, we re-sequenced several samples that validated the presence of these apparently cryptic lineages. Moreover, using museum specimens, Kelsi Rutledge from the University of California recently described subtle but significant morphological differences that discriminate at least two of these lineages, corroborating some of our results and highlighting the need for more exhaustive taxonomic work in the region.
Next steps. I would like to do several genomic analyses on the samples. First, to study the genes involved in this ecological radiation, and second, to perform demographic analysis on a more recent temporal scale and explore the effects of past and current climatic changes. This will help to determine more specific biological and oceanographic factors that promote rapid speciation in these organisms, and in the ocean in general.
If you could study any organism on Earth, what would it be? I would study deep water sharks from the family Etmopteridae, because they are very diverse, can produce bioluminescence, and are poorly studied. There are ~45 species recognized, of which several are considered to have broad geographic distributions, but most likely represent complexes of cryptic species. Some of these complexes would be ideal for studying the speciation process in different stages. The Etmopteridae sharks show several adaptations to deepwater habitats, including bioluminescence. Understanding the evolution of the biochemistry and physiology of these adaptations could be the first step to produce bioluminescence in an ecologically sustainable way. Unfortunately, they are recognized as a group highly susceptible to over-exploitation and human derived climatic change. However, due to the relative inaccessibility of their environment, and the logistical difficulties linked to their maintenance in laboratory, Etmopteridae sharks are poorly studied in general.
Vitor H. F. Gomes is a postdoc affiliated with the Federal University of Pará, Instituto Tecnológico Vale, and Centro Universitário do Pará. Vitor studies the response of Amazonian tree species to global change, and is particularly interested in the effects of climate change and deforestation on species diversity and distribution. His recent work investigates the diversity and distribution of all known Amazonian tree species — 10,071 in total.
Vitor in Mocambo Forest – Pará Brazil 2017: monitoring and measuring a 60 year old permanent plot in Amazonia.
Institution: Federal University of Pará – UFPA, Instituto Tecnológico Vale – ITV, and Centro Universitário do Pará – CESUPA
Current academic life stage: Postdoc
Research interests: I am interested in understanding how Amazonian tree species respond to global change, focusing on the effects caused by climate change and deforestation on species diversity and distribution.
Current study system: I currently study the diversity and distribution of all known Amazonian tree species, a total of 10,071 according to the most recent list. Half of those species may be threatened with extinction by 2050, since they are continually impacted by global change, especially by deforestation and climate change. Amazonia is the largest single block of rainforest on the planet and holds roughly half of all tree species in tropical areas. Understanding the impacts of global change on Amazonian tree species diversity and distribution is fundamental to predict the future of rainforest under human-induced changes, also to maintain and safeguard Amazonian biodiversity.
(left) Vitor in the National Forest of Caxiuanã – Pará/ Brazil 2016: research trip in Amazonia monitoring 11 ha of permanent plots and collecting samples for DNA Barcoding of over 400 species. Speedboat displacement to the permanent monitoring plots, (right) National Forest of Caxiuanã – Pará/ Brazil 2017.
Recent paper in Journal of Biogeography: Gomes, V. H. F., Mayle, F. E., Gosling, W. D., Vieira, I. C., Salomão, R. P., & ter Steege, H. (2020). Modelling the distribution of Amazonian tree species in response to long‐term climate change during the Mid‐Late Holocene. Journal of Biogeography, 47(7): 1530-1540. https://doi.org/10.1111/jbi.13833
Motivation for the paper: Previously published pollen records of rainforest tree species extracted from lake sediments in the southern margin of Amazonia showed that eastern Bolivia rainforests expanded southward over Cerrado savannas between the Mid and Late Holocene (past 3000 years). The concentration of rainforest tree pollen increased in two lakes (sites), Laguna Bella Vista (northern) and Laguna Chaplin (southern), which are 100 km away from each other. The rainforest communities surrounding Laguna Chaplin are younger than those around Laguna Bella Vista, indicating that species have expanded their distribution southward between those lakes in very recent times. This expansion is attributed to the increased seasonal latitudinal migration of the Inter Tropical Convergence Zone. Based on that, we wondered if species’ climate-based environmental suitability also increased during the Mid-Late Holocene in Amazonia, especially in the southern part, contributing to the rainforest expansion. We also wanted to confirm how pollen records from the topmost sediments (surface) correlate to the relative abundance of current plant species. We can use this information in our future research to simulate the abundance distribution of tree species in the past based on fossil pollen data.
Key methodologies: We used models based on machine learning and inverse distance weighting interpolation to produce maps of environmental suitability and relative abundance for tree species of Moraceae and Urticaceae, based on natural history collections and a large plot dataset. We used environmental suitability to test the response of the Amazonian rainforest to long-term climate change. Then, we quantified the increase in suitable areas for tree species in the past 6,000 years. We also used species relative abundance maps to test the correlation between species abundance in the current vegetation versus modern pollen assemblages. Our methods demonstrate how Amazonian rainforest responds to long-term climate change, and addresses questions about tree species distribution under past climate conditions. Also, our methods clarify the relationship between pollen and plant species abundance, connecting evidence of past rainforests from pollen records to species abundance plot data in the present.
(left) Vitor in the National Forest of Saracá-Taquera – Pará/Brazil 2009: research trip in Amazonia monitoring a permanent plot close to the edge of a 200 meter plateau, (right) National Forest of Saracá-Taquera – Pará/Brazil 2009: research trip in Amazonia monitoring and measuring permanent plots on a reforested area. Rest time. Left to right: Mario Rosa (Goeldi Museum), Mr. Bieco (Coopertec), Nelson Rosa (Goeldi Museum), Vitor Gomes.
Unexpected challenges: We found that the suitable areas and species richness for the species studied were higher in a narrow band in the Guiana Shield. Despite that, the abundance of species was very low in this area. Our understanding was that other factors besides environmental conditions might drive species distribution, such as biotic interactions, dissociating potential species distribution from observed species distribution. This outcome may lead the way to new questions and propositions regarding contrasting north-south patterns between species abundance (lower-north/higher-south) and environmental suitability (higher-north/lower-south). Perhaps we can expect lower plant abundance in areas with higher environmental suitability, since competition between species increases with optimal environmental conditions.
Mocambo Forest – Pará Brazil 2017: Research trip in Amazonia monitoring and measuring a 60 year old permanent plot. Collecting leaves. Vitor Gomes and Nelson Rosa (Goeldi Museum).
Major result and contribution to the field: We found that the mean environmental suitability of Moraceae and Urticaceae increased over the past 6,000 years, with southern ecotonal Amazonia showing the highest increase. The accompanied modelled mean species richness increased by as much as 120% throughout Amazonia. However, we found that under a future warmer and drier Amazonia, it is likely that the Holocene range expansion will be reversed over the 21st century. We predict that increased moisture stress will lead to forest and diversity losses, especially in ecotonal areas of Amazonia. Furthermore, we found that the current mean relative abundance of Moraceae and Urticaceae correlated significantly with the modern pollen assemblages for these families. This correlation implies that pollen records can be used to reconstruct the relative abundance of the species in the past.
What are the next steps? The crossover between pollen records, abundance data and environmental suitability models looks promising. The first step is modelling all Amazonian tree species distributions in the past, and looking deeper into the past, reaching the Last Glacial Maximum (~21 kyr before present) and the Last Interglacial (~100 ky before present). Second, I’ll expand our pollen analysis to all tree species with available records. These analyses may connect many pieces of the Amazonian rainforest history. I’m starting a postdoc focusing on the future of Amazonia based on the Paris Agreement goals, which aim to understand how past changes may help us to figure out the possible outcomes of current and future human-induced changes.
If you could study any organism on Earth, what would it be and why? I would like to understand the relationship between tree species and their pollinators and dispersers. That would help to understand processes related to tree species distribution. Bees would be a good start, since many tree species in Amazonia are pollinated by them, and bees are as threatened as tree species due to human-induced changes.
Any other little gems you would like to share? Researching is pretty far from easiness; it is about passion, which makes us surpass distance, cultural differences, economic crises, budget issues and many other challenges present in the daily life of researchers. I should say a big thanks to the coauthors Hans ter Steege, Willian Gosling, Frank Mayle, Ima Vieira and Rafael Salomão, who are all passionate about Amazonia and supported this project.
National Forest of Caxiuanã – Pará/ Brazil 2016: monitoring 11 ha of permanent plots and collecting samples for DNA Barcoding of over 400 species. Rest time and lunch. Left to right: Vitor Gomes, Arua ter Steege, Hans ter Steege (Naturalist), Mr. Joca (Ferreira Pena Station), Nelson Rosa (Museum Goeldi).
The new Editorial Academy at Journal of Biogeography is aimed to help early career biogeographers who are interested to learn more about the publishing process to gain experience with the guidance and support of an experienced mentor.
We are delighted to announce the six inaugural members — Drs. Ricardo Correia, Qin Li, Tom Matthews, Filipa Palmeirim, Amanda Taylor, and Alex Zizka — who begin their tenures today and who will be with the journal for the next two years, after which they may be appointed to the full editorial board.
These early career researchers span a diversity of disciplines, career stages and appointments, and beckon from six different countries. All share a deep interest in biogeography, to which they bring new skills and perspectives that will enrich our perspectives at the journal.
Each of the Editorial Academy members will be partnered one-to-one with a chief editor of the journal and will have the same role as a regular member of the Editorial Board, but a reduced load. The editorial academy brings considerable expertise and a new vantage point to the journal, and we all very much look forward to working together.
If this is an opportunity that may interest you in the future, watch out mid-2021 for the next opportunity to join the editorial academy and board at the Journal of Biogeography.
. Ricardo A. Correia – Helsinki Lab for Interdisciplinary Conservation Science (HELICS), University of Helsinki. Research interests: Species distributions in space and time for conservation applications; using novel data sources to understand how humans are shaping the natural world and using that knowledge to inform conservation.
. Qin Li – Field Museum of Natural History, Chicago, USA. Research interests: Patterns of plant diversity, biogeography of species interactions, and processes of diversification in a changing environment. Especially, floristic structure & environmental, species assembly and co-existence, speciation and adaptation, and ecological niche dynamics in mountainous areas; comparative methods, genetics, and field studies.
. Tom Matthews – University of Birmingham, UK.Research interests: Assessing issues in global environmental change using macroecological, macroevolutionary and biogeographical approaches. Using a mixture of theoretical and empirical methods to investigate various macroecological topics, including species–area relationships and species abundance distributions; any place and taxon, but especially islands and birds.
. Ana Filipa Palmeirim – University of East Anglia, UK. Research interests: Complex biodiversity responses to habitat loss and fragmentation, and how they affect foodweb structure and overall ecosystem functioning. Her research is focused on both terrestrial and insular forest fragments (reservoir islands) across tropical forests, combining different dimensions of diversity at multiple spatial scales.
. Amanda Taylor – University of Göttingen, Germany. Research interests: Disentangling complex diversity patterns on islands using plants as model organisms. Particularly constraints on the assembly of island floras such as species interactions (e.g. plant-pollinator) or the environment (e.g. climate).
. Alexander Zizka – German Centre for Integrative Biodiversity Research (iDiv). Research interests: Evolution and distribution of tropical plants (especially the pineapple family, Bromeliaceae), and the use of “big data” for biogeography and conservation. Integrating large-scale data sets of species distribution with molecular phylogenies and traits, to understand biodiversity in time and space.
Shalik is a postdoc at the Institute of Tibetan Plateau Research. He an ecologist working in the Himalayas to understand how climate change might cause shifts in alpine treelines. Shalik shares his recent work on the combined influence of climate and intraspecific interactions on these treelines.
Shalik collecting treeline data in the Manang valley, central Nepal. (Photo credit: Samresh Rai, 2 November 2015)
Institute. Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing China
Academic life stage. Postdoc.
Major research themes. My research focuses on understanding alpine treeline responses to changing climate at multiple spatial scales using dendroecological tools, particularly in the Himalayas. I have a keen interest in the use of spatio-temporal data for understanding how treeline responds to changing climate.
Current study system. Currently, I am working on the treeline ecotone in the central Himalayas. The Himalayas host one of the longest natural treeline ranges, extending from Pakistan to southeast China crossing different climatic zones (westerly- and monsoon-dominated areas). As this area is experiencing a faster warming rate than other areas, the alpine treeline is considered as a potential indicator to track influence of climate warming on alpine ecosystem. In response to climate warming, the treeline is expected to move upslope. However, our early study showed a non-linear relationship between rates of treeline shift and warming climate, raising some questions about the mechanisms affecting the treeline shift.
A natural Himalayan birch (Betula utilis) treeline located at ablout 4100 m. a.s.l. in the Langtang valley, central Nepal. (Photo credit: Shalik Ram Sigdel, 17 April 2014)
Recent publication in JBI. Sigdel, S. R., Liang, E., Wang, Y., Dawadi, B., Camarero, J. J. (2020). Tree-to-tree interactions slow down Himalayan treeline shifts as inferred from tree spatial patterns. Journal of Biogeography, 47(8):1816–1826. https://doi.org/10.1111/jbi.13840
Major motivation for this paper. The major motive of this research was to investigate the role of intra-species interactions (spatial patterns) on responsiveness of treelines to climate warming. Mountainous regions across the globe (including the Himalayas) have been experiencing increased recruitment as a result of climatic warming. However, in the Himalayas, the rate of treeline shift has been slower, relative to other parts of the world. Heterogeneous response of Himalayan treeline to a warming climate indicates that rates of treeline shifts may be affected by local-scale interactions (particularly intra-species interactions). However, it is unknown whether Himalayan treeline dynamics show lagged or weak responses to climate warming due to treeline densification and clustering intensity of trees (tree-to-tree-interactions) or not. We expected to discern if tree-to-tree-interactions regulate the pace of treeline shifts, and to determine if those interactions are more important drivers of changes at treelines than climate. We hope this study will help to better understand how local interactions drive large scale pattern formation at treeline and their response to changing climate.
Key methodologies. We established a network of treeline plots across the central Himalayas, encompassing a wide longitudinal gradient characterized by increasing precipitation eastwards. The location of each individual tree within the plot was measured, and their ages were estimated by applying a dendrochronological approach. We used the locations and age of the trees to calculate the changes in tree density, treeline elevation changes, distance between neighbouring trees, and the spatial patterns (clustering intensity) for 50-year age-classes (1-50, 51-100, 101-150 years) of two main tree species at the treeline (Himalayan birch and Himalayan fir). The relationships between these parameters were used to understand the driving mechanism of Himalayan treeline shift.
Taking tree-ring sample from Himalayan fir (Abies spectabilis) to get the germination date and age of the trees (Photo credit: Samresh Rai, 31 October 2015)
Major challenges. Our treeline sites were located in remote mountain region of the Himalayas and can be reached after 3-4 days continuous trekking. The Himalayan mountains are characterized by a complex regional climate system. Hostile climatic conditions and the remoteness of treeline sites are big challenges to surveying a large-scale network of treeline plots, which took several months. Even though we had only a very short time window suitable for conducting field surveys, we were able to collect data along the east-west precipitation gradient (more than 800 km) across the central Himalayas after 3 years continuous effort.
Major results. Based on the network of treeline plots across an east-west precipitation gradient in the central Himalayas, our study revealed that treeline shift rates were not only limited by climate but also affected by intra-species relationships. Higher clustering of young trees increased with increasing moisture stress from the eastern to western sites but treeline shifts rates were higher at wet eastern treelines where clustering intensity is lower than at dry western sites. The higher distance between neighboring trees, the faster the shifting rate, and vice-versa. This is an important empirical advance in the study of driving mechanism of alpine treeline shift, showing how climatic and non-climatic factors interact at the local scale to drive treeline patterns. Furthermore, it explains the spatial differences in treeline shifts from the perspective of intraspecific relationships, and quantifies the role of biological factors on treeline shifts. It also underscores the lag effect of treeline shifts in response to climate warming.
Next steps? In this study, we considered the treeline sites dominated by single species (either Betula utilis or Abies spectabilis). But we found some treelines with both species together. Currently, we are working on such mixed species treelines to determine if species specific spatial patterns shape treeline structure and to examine if those patterns drive the shift rate of particular species.
If you could study any organism on Earth, what wold it be? I am fascinated by alpine grassland ecosystems, which are highly sensitive to global change. Alpine plants are the most interesting organisms to me and I would love to study the impact of climate change on their establishment, survival, reproduction and distribution, particularly in the central Himalayas (which is a global biodiversity hotspot). As one of the most affected terrestrial ecosystems, alpine plant communities in the Himalayas are ideal systems to monitor the impacts of climate warming. Additionally, I feel relaxed while working in the beautiful Himalayan mountains, and enjoy the pristine environment.