Supplementary material from "Functional volumes, niche packing and species richness: biogeographic legacies in the Congo Basin"
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Posted on 2020-03-11 - 07:31
Understanding the determinants of species coexistence in complex and species-rich communities is a fundamental goal of ecology. Patterns of species coexistence depend on how biotic interactions and environmental filtering act over ecological and evolutionary time scales. Climatic fluctuations in lowland rainforests of the Congo Basin led to the number of vertebrate species being significantly lower in central compared with northern ecoregions of the Basin. We used null models to assess whether climatic variations affected the community assembly of shrews. A consistent limit to functional similarity of species was not related to species richness. Rather, species richness is constrained by environmental factors, and these constraints are stronger in the central lowland forests of the Congo Basin. By constraining species geographic distributions, historical effects of rainforest refugia arising from climatic fluctuations may affect contemporary species composition of local shrew communities. The Congo River represents a vicariance event that led to allopatric speciation of shrews and continues to represent a barrier to dispersal. Ultimately, the historical effects of this barrier have led to differences in the functional volume of shrew communities in northern and central ecoregions. We suggest that the analyses of community assembly can be used to identify Holocene refugia in the Congo Basin.
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Van de Perre, Frederik; Willig, Michael R.; Presley, Steven J.; Mukinzi, Itoka Jean-Claude; Gambalemoke, Mbalitini Sylvestre; Leirs, Herwig; et al. (2020). Supplementary material from "Functional volumes, niche packing and species richness: biogeographic legacies in the Congo Basin". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.4860612.v3