Chimpanzee population structure in Cameroon and Nigeria is associated with habitat variation that may be lost under climate change

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• 作者：Paul R Sesink Clee (1) (2)
  Ekwoge E Abwe (3) (4)
  Ruffin D Ambahe (5)
  Nicola M Anthony (6)
  Roger Fotso (5)
  Sabrina Locatelli (2) (7)
  Fiona Maisels (8) (9)
  Matthew W Mitchell (1) (2)
  Bethan J Morgan (3) (4) (8)
  Amy A Pokempner (2) (9)
  Mary Katherine Gonder (1) (2)
  
  1. Department of Biology ; Drexel University ; Philadelphia ; PA ; 19104 ; USA
  2. Department of Biological Sciences ; University at Albany 鈥?State University of New York ; Albany ; NY ; 12222 ; USA
  3. Institute for Conservation Research ; Zoological Society of San Diego ; Escondido ; CA ; 92027 ; USA
  4. Ebo Forest Research Project ; BP 3055 ; Messa ; Yaound茅 ; Cameroon
  5. Wildlife Conservation Society 鈥?Cameroon ; Yaound茅 ; Cameroon
  6. Department of Biological Sciences ; University of New Orleans ; New Orleans ; LA ; 70148 ; USA
  7. Institut de Recherche pour le D茅veloppement (IRD) and Universit茅 Montpellier 1 (UM1) ; Montpellier ; 34394 ; France
  8. School of Natural Sciences ; University of Stirling ; Stirling ; FK9 4LA ; UK
  9. Wildlife Conservation Society ; Bronx ; New York ; 10460 ; USA
  
• 刊名：BMC Evolutionary Biology
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：15
• 期：1
• 全文大小：2,142 KB
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• 刊物主题：Evolutionary Biology; Animal Systematics/Taxonomy/Biogeography; Entomology; Genetics and Population Dynamics; Life Sciences, general;
• 出版者：BioMed Central
• ISSN：1471-2148

文摘

Background The Nigeria-Cameroon chimpanzee (Pan troglodytes ellioti) is found in the Gulf of Guinea biodiversity hotspot located in western equatorial Africa. This subspecies is threatened by habitat fragmentation due to logging and agricultural development, hunting for the bushmeat trade, and possibly climate change. Although P. t. ellioti appears to be geographically separated from the neighboring central chimpanzee (P. t. troglodytes) by the Sanaga River, recent population genetics studies of chimpanzees from across this region suggest that additional factors may also be important in their separation. The main aims of this study were: 1) to model the distribution of suitable habitat for P. t. ellioti across Cameroon and Nigeria, and P. t. troglodytes in southern Cameroon, 2) to determine which environmental factors best predict their optimal habitats, and 3) to compare modeled niches and test for their levels of divergence from one another. A final aim of this study was to examine the ways that climate change might impact suitable chimpanzee habitat across the region under various scenarios. Results Ecological niche models (ENMs) were created using the software package Maxent for the three populations of chimpanzees that have been inferred to exist in Cameroon and eastern Nigeria: (i) P. t. troglodytes in southern Cameroon, (ii) P. t. ellioti in northwestern Cameroon, and (iii) P. t. ellioti in central Cameroon. ENMs for each population were compared using the niche comparison test in ENMtools, which revealed complete niche divergence with very little geographic overlap of suitable habitat between populations. Conclusions These findings suggest that a positive relationship may exist between environmental variation and the partitioning of genetic variation found in chimpanzees across this region. ENMs for each population were also projected under three different climate change scenarios for years 2020, 2050, and 2080. Suitable habitat of P. t. ellioti in northwest Cameroon / eastern Nigeria is expected to remain largely unchanged through 2080 in all considered scenarios. In contrast, P. t. ellioti in central Cameroon, which represents half of the population of this subspecies, is expected to experience drastic reductions in its ecotone habitat over the coming century.