TY - JOUR
T1 - Tracing the diversification history of a Neogene rodent invasion into South America
AU - Maestri, Renan
AU - Upham, Nathan S.
AU - Patterson, Bruce D.
N1 - Funding Information:
Acknowledgements – We thank Daniel Rabosky for valuable critiques on an early draft, Diogo B. Provete and two anonymous reviewers for extensive comments and suggestions that improved the manuscript, and Ignacio Quintero for help with the rase maps. We again acknowledge the careful expertise of Jessica Molhman in digitizing the South American rodent maps during her assistantship at the Field Museum. Funding – NSU was supported by the NSF VertLife Terrestrial grant (#1441737). RM was supported by CnPq (150391/2017-0) during the initial preparation of this paper.
Publisher Copyright:
© 2018 The Authors
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/4
Y1 - 2019/4
N2 - We investigated spatial patterns of evolutionary relatedness and diversification rates to test hypotheses about the historical biogeographic processes underlying the radiation of Neotropical rats and mice (Sigmodontinae, ~400 species). A negative correlation between mean phylogenetic distance and diversification rates of rodent assemblages reveals a pattern of species co-occurrence in which assemblages of closely related species are also the fastest diversifying ones. Subregions of the Neotropics occupied by distantly related species that are on average more slowly diversifying include Central America, northern South America, and the Atlantic forest. In southern South America, recent species turnover appears to have been higher. Ancestral locations for the main tribes of sigmodontines were also estimated, suggesting eastern South America and the Amazonian lowlands were colonized before some central Andean regions, even though the latter are now centers of species richness for these rodents. Moreover, a past connection between the tropical Andes and the Atlantic Forest is suggested by our results, highlighting a role for a hypothetical arc connecting the two biomes, which would have impacted many other groups of organisms. Whether rapid, recent speciation in some regions is related to Quaternary climatic fluctuations and the young age of sigmodontines (~12.7 Ma crown age) or instead to intrinsic traits of these rodents remains an open question. If the former is true, we hypothesize that contrasting trends will characterize older Neotropical clades.
AB - We investigated spatial patterns of evolutionary relatedness and diversification rates to test hypotheses about the historical biogeographic processes underlying the radiation of Neotropical rats and mice (Sigmodontinae, ~400 species). A negative correlation between mean phylogenetic distance and diversification rates of rodent assemblages reveals a pattern of species co-occurrence in which assemblages of closely related species are also the fastest diversifying ones. Subregions of the Neotropics occupied by distantly related species that are on average more slowly diversifying include Central America, northern South America, and the Atlantic forest. In southern South America, recent species turnover appears to have been higher. Ancestral locations for the main tribes of sigmodontines were also estimated, suggesting eastern South America and the Amazonian lowlands were colonized before some central Andean regions, even though the latter are now centers of species richness for these rodents. Moreover, a past connection between the tropical Andes and the Atlantic Forest is suggested by our results, highlighting a role for a hypothetical arc connecting the two biomes, which would have impacted many other groups of organisms. Whether rapid, recent speciation in some regions is related to Quaternary climatic fluctuations and the young age of sigmodontines (~12.7 Ma crown age) or instead to intrinsic traits of these rodents remains an open question. If the former is true, we hypothesize that contrasting trends will characterize older Neotropical clades.
KW - diversification rate
KW - evolutionary radiation
KW - historical biogeography
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U2 - 10.1111/ecog.04102
DO - 10.1111/ecog.04102
M3 - Article
AN - SCOPUS:85054184232
SN - 0906-7590
VL - 42
SP - 683
EP - 695
JO - Ecography
JF - Ecography
IS - 4
ER -