Technical Comments

Comment on “Conspecific Negative Density Dependence and Forest Diversity”

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Science  26 Oct 2012:
Vol. 338, Issue 6106, pp. 469
DOI: 10.1126/science.1225520

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Johnson and colleagues (Reports, 18 May 2012, p. 904) claim that conspecific negative density dependence is a pervasive mechanism driving forest diversity, especially for rare tree species. We show that their results are due to a statistical bias in their analysis caused by the exclusion of joint absences.

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