First North American fossil monkey and early Miocene tropical biotic interchange

@article{Bloch2016FirstNA,
  title={First North American fossil monkey and early Miocene tropical biotic interchange},
  author={Jonathan I. Bloch and Emily D. Woodruff and Aaron R. Wood and Aldo F. Rincon and Arianna R Harrington and Gary S. Morgan and David A. Foster and Camilo Montes and Carlos Jaramillo and Nathan A. Jud and Douglas S. Jones and Bruce J. MacFadden},
  journal={Nature},
  year={2016},
  volume={533},
  pages={243-246}
}
New World monkeys (platyrrhines) are a diverse part of modern tropical ecosystems in North and South America, yet their early evolutionary history in the tropics is largely unknown. Molecular divergence estimates suggest that primates arrived in tropical Central America, the southern-most extent of the North American landmass, with several dispersals from South America starting with the emergence of the Isthmus of Panama 3–4 million years ago (Ma). The complete absence of primate fossils from… 
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This is a description of the South American fauna (and some that arrived from North America) that populated the Caribbean Islands and how this fauna might have arrived. Fossils tell us a story that
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Early anthropoids and certain Asian rodent clades seem to have been especially adept at accomplishing sweepstakes dispersal, particularly during the Eocene, although this process has classically been envisioned as highly random and extremely rare.
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Ancient environmental and sea-level changes are very likely to have played key roles in primate speciation, extinction, adaptation, and dispersal. Most modern primates are ecologically dependent on
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TLDR
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The asymmetry of the interchange was not due to higher origination of immigrants in South America as previously suggested, but resulted from higher extinction of native taxa in southern South America.
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