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Nature 438, E2 (3 November 2005) | doi:10.1038/nature04309; Published online 2 November 2005

Ecology: Is speciation driven by species diversity? (Reply)

Brent C. Emerson1 & Niclas Kolm1,2

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Cadena et al.1 question our conclusion that species diversity can positively influence speciation rate on the basis of their analysis of a data set for West Indian land birds, in which an additional variable is added — lineage age. Here we clarify our hypothesis and show why their system is not suitable for testing whether species diversity can drive speciation.

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