Phylogeography and evolutionary history of the Crocidura olivieri complex (Mammalia, Soricomorpha): from a forest origin to broad ecological expansion across Africa

BMC Evolutionary Biology

Research Article

Julian C Kerbis Peterhans¹  William T Stanley²  Steven M Goodman³  Arnaud Couloux⁴  Violaine Nicolas⁵  Christiane Denys⁵  François Jacquet⁵  Josef Bryja⁶  Erik Verheyen⁷  Marc Colyn⁸  Rainer Hutterer⁹ 

[1] College of Professional Studies, Roosevelt University, 430 S Michigan Avenue, 60605, Chicago, IL, USA;Field Museum of Natural History, 1400 South Lake Shore Drive, 60605, Chicago, IL, USA;Field Museum of Natural History, 1400 South Lake Shore Drive, 60605, Chicago, IL, USA;Field Museum of Natural History, 1400 South Lake Shore Drive, 60605, Chicago, IL, USA;Association Vahatra, BP 3972, 101, Antananarivo, Madagascar;Génoscope, Centre National de Séquençage, 2 rue Gaston Crémieux, CP5706, 91057, Evry Cedex, France;Institut de Systématique, Évolution, Biodiversité, ISYEB UMR 7205 - CNRS, MNHN, UPMC, EPHE, Muséum National d’Histoire Naturelle, Sorbonne Universités, 57 rue Cuvier, CP 51, 75005, Paris, France;Institute of Vertebrate Biology ASCR, Academy of Sciences of the Czech Republic, Květná 8, 603 65, Brno, Czech Republic;Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic;Royal Belgian Institute of Natural Sciences, Operational Direction Taxonomy and Phylogeny, Molecular Laboratory, Vautierstraat 29, 1000, Brussels, Belgium;Biology Department, University of Antwerpen, Evolutionary Ecology Group, Groenenborgerlaan 171, 2020, Antwerpen, Belgium;Université de Rennes 1, CNRS, UMR 6553 Ecobio, Station Biologique, 35380, Paimpont, France;Zoologisches Forschungmuseum Alexander Koenig, Adenauerallee 160, D-53113, Bonn, Germany;

关键词: Crocidura olivieri;    Diversification;    Forest refuge;    Molecular dating;    Phylogeography;    Pleistocene climate changes;    Riverine barrier;    Soricidae;    Systematics;   

DOI  :  10.1186/s12862-015-0344-y

 received in 2014-11-11, accepted in 2015-03-30,  发布年份 2015

来源: Springer

【 摘 要 】

BackgroundThis study aims to reconstruct the evolutionary history of African shrews referred to the Crocidura olivieri complex. We tested the respective role of forest retraction/expansion during the Pleistocene, rivers (allopatric models), ecological gradients (parapatric model) and anthropogenic factors in explaining the distribution and diversification within this species complex. We sequenced three mitochondrial and four nuclear markers from 565 specimens encompassing the known distribution of the complex, i.e. from Morocco to Egypt and south to Mozambique. We used Bayesian phylogenetic inference, genetic structure analyses and divergence time estimates to assess the phylogenetic relationships and evolutionary history of these animals.ResultsThe C. olivieri complex (currently composed of C. olivieri, C. fulvastra, C. viaria and C. goliath) can be segregated into eight principal geographical clades, most exhibiting parapatric distributions. A decrease in genetic diversity was observed between central and western African clades and a marked signal of population expansion was detected for a broadly distributed clade occurring across central and eastern Africa and portions of Egypt (clade IV). The main cladogenesis events occurred within the complex between 1.37 and 0.48 Ma. Crocidura olivieri sensu stricto appears polyphyletic and C. viaria and C. fulvastra were not found to be monophyletic.ConclusionsClimatic oscillations over the Pleistocene probably played a major role in shaping the genetic diversity within this species complex. Different factors can explain their diversification, including Pleistocene forest refuges, riverine barriers and differentiation along environmental gradients. The earliest postulated members of the complex originated in central/eastern Africa and the first radiations took place in rain forests of the Congo Basin. A dramatic shift in the ecological requirements in early members of the complex, in association with changing environments, took place sometime after 1.13 Ma. Some lineages then colonized a substantial portion of the African continent, including a variety of savannah and forest habitats. The low genetic divergence of certain populations, some in isolated localities, can be explained by their synanthropic habits. This study underlines the need to revise the taxonomy of the C. olivieri complex.

【 授权许可】

CC BY   
© Jacquet et al.; licensee BioMed Central. 2015