TECHNICAL COMMENT ABSTRACTS

摘要

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. Dickie, Hurst, and Bellingham question some of the methods of our recent study on conspecific density dependence in forests. Here, we reanalyze our data set with the inclusion of joint absence plots of each species.