Abstract
The white-eared opossum, Didelphis albiventris Lund, 1840, is one of the most widely distributed South American marsupials. As currently defined, the species ranges from northeastern and central Brazil through Paraguay and central Bolivia, all of Uruguay, and in Argentina, from the north to northern Patagonia. Previous phylogeographic analyses found two haplogroups, one corresponding to northeastern and central Brazil and the other to southern Brazil, Bolivia, and Paraguay. In those studies, differentiation was based on the geographic distance between both regions and the presence of geographic barriers among populations. The aims of the present contribution were to perform population-genetic analyses using the mitochondrial markers cytochrome c oxidase 1 (COI) and cytochrome b (cyt b) in order to elucidate the phylogeographic history of this species by incorporating samples from Argentina into the published datasets, and to evaluate whether there is more than one taxonomic entity under the name Didelphis albiventris. We studied the craniodental morphology of the species and used environmental niche modeling (ENM) as an additional methodology to investigate the environmental factors affecting its distribution. Our molecular, morphological, and ENM results strongly suggest the existence of two taxonomic entities under Didelphis albiventris, one in southern Brazil, Argentina, Paraguay, Uruguay, and Bolivia, and the other in central and northern Brazil. Data from specimens in the missing middle part of the taxon’s range and evidence from nuclear markers are needed before formalizing a taxonomic split.
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Acknowledgements
We thank the curators for granting us access to the collections under their care: João Oliveira, Robert Voss, Pablo Teta, Raúl Maneyro, Sergio Bogan, Enrique González, Mario de Vivo, and Juliana Gualda. We thank Baltazar González for the discussion on ecological niche modelling (ENM), providing the code, and running the models. Facundo Morinigo and Alberto Fameli helped with the laboratory analyses. Adrian Monjeau and Nature Map Argentina provided the computing power needed for the ENM. Maria Claudene Barros and Daiane Chaves Nascimento sent us the sequences from their work in Brazil. GMM thanks Michael Simeon and Eugene Watkins for economic support. We also thank the two reviewers who helped to improve the manuscript.
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MAC conceived the study. MAC and RG-I performed the molecular analyses. GM performed the environmental niche modelling analyses. GM and MAC studied the morphology of the specimens. MAC and GM wrote the manuscript, MAC, RG-I and GM made the figures. RG-I reviewed and edited the text.All authors read and approved the final manuscript.
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The authors declare they have no financial interests. This work was supported by Agencia I + D + I from Argentina, grant numbers PICT 2016–3151 and PICT 2019 − 1545.
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GMM is an Associate Editor of the Journal of Mammalian Evolution but was not involved in the evaluation of this manuscript.
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Online Resources 1-5, including sequence data (Online Resources 1-4) and list of specimens analyzed for the morphological analysis.
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Online Resources 7-13: Time-calibrated tree obtained from the analysis of the cyt b haplotypes (Online Resource 7),results of the phylogeographic analyses of haplogroups A and B (Online Resources 8-10), results of the speciesdelimitation analyses (Online Resources 11-12), and ecological niche models obtained for each group.
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Chemisquy, M.A., González-Ittig, R.E. & Martin, G.M. Hidden in plain sight: Didelphis albiventris (Didelphimorphia: Didelphidae) might not be a single species. J Mammal Evol 30, 873–889 (2023). https://doi.org/10.1007/s10914-023-09685-1
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DOI: https://doi.org/10.1007/s10914-023-09685-1