The latitudinal gradient in recent speciation and extinction rates of birds and mammals
- PMID: 17363673
- DOI: 10.1126/science.1135590
The latitudinal gradient in recent speciation and extinction rates of birds and mammals
Abstract
Although the tropics harbor greater numbers of species than do temperate zones, it is not known whether the rates of speciation and extinction also follow a latitudinal gradient. By sampling birds and mammals, we found that the distribution of the evolutionary ages of sister species-pairs of species in which each is the other's closest relative-adheres to a latitudinal gradient. The time to divergence for sister species is shorter at high latitudes and longer in the tropics. Birth-death models fitting these data estimate that the highest recent speciation and extinction rates occur at high latitudes and decline toward the tropics. These results conflict with the prevailing view that links high tropical diversity to elevated tropical speciation rates. Instead, our findings suggest that faster turnover at high latitudes contributes to the latitudinal diversity gradient.
Comment in
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Explaining latitudinal diversity gradients.Science. 2007 Jul 27;317(5837):451-3; author reply 451-3. doi: 10.1126/science.317.5837.451. Science. 2007. PMID: 17656703 No abstract available.
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Comment on "The latitudinal gradient in recent speciation and extinction rates of birds and mammals".Science. 2008 Feb 15;319(5865):901; author reply 901. doi: 10.1126/science.1150568. Science. 2008. PMID: 18276872
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