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Science 16 May 2008:
Vol. 320. no. 5878, p. 874
DOI: 10.1126/science.1155114

Technical Comments

Comment on "Habitat Split and the Global Decline of Amphibians"

David C. Cannatella

Section of Integrative Biology, University of Texas, Austin, TX 78712, USA. E-mail: catfish{at}mail.utexas.edu


Figure 1 Fig. 1. (A) The left y axis shows the proportions of aquatic-reproducing species for 12 sites (black squares with total number of species) against habitat split. The right y axis shows the probability (from the dotted logistic regression line) of any sampled species being aquatic for a given value of habitat split. The regression slope is not different than 0 (P = 0.596). Although the logistic regression line appears linear over the range shown, it is actually a curvilinear function. (B) Plot of data from Becker et al. (2). The slopes of the regression lines for aquatic and terrestrial species are not significantly different (analysis of covariance, P = 0.116). [View Larger Version of this Image (29K GIF file)]
 





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Science. ISSN 0036-8075 (print), 1095-9203 (online)