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Title: Biogeography of squirrel monkeys (genus Saimiri): South-central Amazon origin and rapid pan-Amazonian diversification of a lowland primate
Authors: Lynch Alfaro, Jessica W.
Boubli, Jean Philippe
Paim, Fernanda Pozzan
Ribas, Camila Cherem
Silva, Maria Nazareth Fda
Messias, Mariluce Rezende
Röhe, Fábio
Mercês, Michelle P.
Silva Júnior, José de Sousa e
Silva, Cláudia Regina
Pinho, Gabriela Medeiros
Koshkarian, Gohar
Nguyen, Mai T.T.
Harada, Maria Lúcia
Rabelo, Rafael M.
Queiroz, Helder Lima de
Alfaro, Michael E.
Farias, Izeni P.
Keywords: Cebidae
Saimiri Sciureus
Saimiri Ustus
Saimiri Vanzolinii
Dna, Mitochondrial
Bayes Theorem
Biological Model
Dna Sequence
South America
Squirrel Monkey
Bayes Theorem
Biological Evolution
Dna, Mitochondrial
Models, Genetic
Sequence Analysis, Dna
South America
Issue Date: 2015
metadata.dc.publisher.journal: Molecular Phylogenetics and Evolution
metadata.dc.relation.ispartof: Volume 82, Número PB, Pags. 436-454
Abstract: The squirrel monkey, Saimiri, is a pan-Amazonian Pleistocene radiation. We use statistical phylogeographic methods to create a mitochondrial DNA-based timetree for 118 squirrel monkey samples across 68 localities spanning all Amazonian centers of endemism, with the aim of better understanding (1) the effects of rivers as barriers to dispersal and distribution; (2) the area of origin for modern Saimiri; (3) whether ancestral Saimiri was a lowland lake-affiliated or an upland forest taxa; and (4) the effects of Pleistocene climate fluctuation on speciation. We also use our topology to help resolve current controversies in Saimiri taxonomy and species relationships. The RondÔnia and Inambari centers in the southern Amazon were recovered as the most likely areas of origin for Saimiri. The Amazon River proved a strong barrier to dispersal, and squirrel monkey expansion and diversification was rapid, with all speciation events estimated to occur between 1.4 and 0.6. Ma, predating the last three glacial maxima and eliminating climate extremes as the main driver of squirrel monkey speciation. Saimiri expansion was concentrated first in central and western Amazonia, which according to the "Young Amazon" hypothesis was just becoming available as floodplain habitat with the draining of the Amazon Lake. Squirrel monkeys also expanded and diversified east, both north and south of the Amazon, coincident with the formation of new rivers. This evolutionary history is most consistent with a Young Amazon Flooded Forest Taxa model, suggesting Saimiri has always maintained a lowland wetlands niche and was able to greatly expand its range with the transition from a lacustrine to a riverine system in Amazonia. Saimiri vanzolinii was recovered as the sister group to one clade of Saimiri ustus, discordant with the traditional Gothic vs. Roman morphological division of squirrel monkeys. We also found paraphyly within each of the currently recognized species: S. sciureus, S. ustus, and S. macrodon. We discuss evidence for taxonomic revision within the genus Saimiri, and the need for future work using nuclear markers. © 2014 Elsevier Inc.
metadata.dc.identifier.doi: 10.1016/j.ympev.2014.09.004
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