Neotropical birds show a humped distribution of within-population genetic diversity along a latitudinal transect

Matthew J. Miller, Eldredge Bermingham, John Klicka, Patricia Escalante, Kevin Winker

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

The latitudinal gradient in species richness is a nearly universal ecological phenomenon. Similarly, conspecific genetic diversity often increases towards the equator - usually explained as the consequence of post-glacial range expansion or due to the shared response of genetic diversity to processes that promote species richness. However, no study has yet examined the relationship between latitude and within-population genetic diversity in exclusively tropical species. We surveyed genetic variation in nine resident bird species co-occurring in tropical lowlands between southern Mexico and western Ecuador, where avian species richness increases with decreasing latitude. Within-population genetic variation was always highest at mid-range latitudes, and not in the most equatorial populations. Differences in demography and gene flow across species' ranges may explain some of our observations; however, much of the pattern may be due simply to geometric constraints. Our findings have implications for conservation planning and for understanding how biodiversity scales from genes to communities.

Original languageEnglish (US)
Pages (from-to)576-586
Number of pages11
JournalEcology Letters
Volume13
Issue number5
DOIs
StatePublished - May 2010

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics

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