Journal
MOLECULAR PHYLOGENETICS AND EVOLUTION
Volume 82, Issue -, Pages 436-454Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ympev.2014.09.004
Keywords
Pleistocene diversification; South America; Cebidae; Phylogenetics; River barriers; Refugia hypothesis
Funding
- NSF [BCS 0833375]
- Sustainable Development of the Brazilian Biodiversity Program - PROBIO/MMA/BIRD/GEF/CNPq
- Zoological Society of San Diego the University of Auckland
- National Geographic Waitts Grants
- CAPES/FAPEAM
- Institut de Desenvolvimento Sustentavel Mamiraua (IDSM-OS/MCTI)
- CNPq [134647/2011-4, 307951/2012-0]
- FAPEAM
- FAPESP
- CAPES
- NSF
- MCT/CNPq/CTAmazonia [55/2008]
- Rede Bionorte Projeto Conservacao, uso e bioprospeccao da biodiversidade da Amazonia Meridional - Mato Grosso MCTI/CNPq/FAPEMAT
- CNPq SISBIOTA Program [563348/2010-0]
- Sociedade Brasileira de Primatologia
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The squirrel monkey, Saimiri, is a pan-Amazonian Pleistocene radiation. We use statistical phylogeographic methods to create a mitochondria] 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 Rondonia 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. (C) 2014 Elsevier Inc. All rights reserved.
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