Colonization of the deep sea by fishes.

there are other explanatory variables), the very large sample size (10 695) makes the effect of phylogeny highly significant ( P < 0·001).

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RESULTS COMPARISON OF CLASSES MYXINI, CHONDRICHTHYES AND ACTINOPTERYGII There was an overall trend of logarithmic decrease in species number with depth described by the fitted regression equation: all marine fish species log 10 N = −0·000422 x + 3·610000 ( r 2 = 0·948), where N is the number of species maximum depths per 500 m depth stratum and x is the depth (m).

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