Idiosyncratic responses to climate-driven forest fragmentation and marine incursions in reed frogs from Central Africa and the Gulf of Guinea Islands

Bell, Rayna C., Parra, Juan L., Badjedjea, Gabriel, Barej, Michael F., Blackburn, David C., Burger, Marius, Channing, Alan, Dehling, Maximilian, Greenbaum, Eli, Gvoždík, Václav, Kielgast, Jos, Kusamba, Chifundera, Lötters, Stefan, McLaughlin, Patrick J., Nagy, Zoltán T., Rödel, Mark-Oliver, Portik, Daniel M., Stuart, Bryan L., VanDerWal, Jeremy, Zassi-Boulou, Ange Ghislain, and Zamudio, Kelly R. (2017) Idiosyncratic responses to climate-driven forest fragmentation and marine incursions in reed frogs from Central Africa and the Gulf of Guinea Islands. Molecular Ecology, 26 (19). pp. 5223-5244.

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Organismal traits interact with environmental variation to mediate how species respond to shared landscapes. Thus, differences in traits related to dispersal ability or physiological tolerance may result in phylogeographic discordance among co-distributed taxa, even when they are responding to common barriers. We quantified climatic suitability and stability, and phylogeographic divergence within three reed frog species complexes across the Guineo-Congolian forests and Gulf of Guinea archipelago of Central Africa to investigate how they responded to a shared climatic and geological history. Our species-specific estimates of climatic suitability through time are consistent with temporal and spatial heterogeneity in diversification among the species complexes, indicating that differences in ecological breadth may partly explain these idiosyncratic patterns. Likewise, we demonstrated that fluctuating sea levels periodically exposed a land bridge connecting Bioko Island with the mainland Guineo-Congolian forest and that habitats across the exposed land bridge likely enabled dispersal in some species, but not in others. We did not find evidence that rivers are biogeographic barriers across any of the species complexes. Despite marked differences in the geographic extent of stable climates and temporal estimates of divergence among the species complexes, we recovered a shared pattern of intermittent climatic suitability with recent population connectivity and demographic expansion across the Congo Basin. This pattern supports the hypothesis that genetic exchange across the Congo Basin during humid periods, followed by vicariance during arid periods, has shaped regional diversity. Finally, we identified many distinct lineages among our focal taxa, some of which may reflect incipient or unrecognized species.

Item ID: 51607
Item Type: Article (Research - C1)
ISSN: 1365-294X
Keywords: climatic refugia, ecological niche modelling, Hyperolius, land-bridge island, lineage divergence, riverine barriers
Funders: Explorer's Club, American Philosophical Society, Sigma Xi, Society of Systematic Biologists, Mario Einaudi Center for International Studies, Cornell Graduate School, Andrew W. Mellon Foundation, EEB Paul P. Feeny Fund, EEB Paul Graduate Fellowship, University of California (UC), Museum of Comparative Zoology herpetology Division at Harvard University, Federal Ministry of Education and Research (BMBF), BIOTA Gemany, US National Science Foundation (NSF), National Geographic Society (NGS), California Academy of Sciences, Percy Sladen Memorial Fund Grant, IUCN/SSC Amphibian Specialist Group, Department of Biology at Villanova University, University of Texas at El Paso, Czech Science Foundation (CSF), Ministry of Culture of the Czech Republic (MCCR), National Museum (NM)
Projects and Grants: UC President's Postdoctoral Fellowship, BMBF BIOTA projects, BIOTA Grant number 01LC0017, BIOTA Grant number 01LC0025, NSF Grant/Award number DEB-1309171, NSF Grant/Award number DEB-1145459, NGS Grant/Award number 8556-08, NGS Grant/Award number 8868-10, CSF Grant/Award number 15-13415Y, MCCR Grant/Award number DKRVO2017/15, NM Grant/Award number 00023272
Date Deposited: 22 Nov 2017 07:37
FoR Codes: 31 BIOLOGICAL SCIENCES > 3109 Zoology > 310907 Animal physiological ecology @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970105 Expanding Knowledge in the Environmental Sciences @ 100%
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