Technical Comments

Comment on "Statistical Independence of Escalatory Ecological Trends in Phanerozoic Marine Invertebrates"

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Science  10 Nov 2006:
Vol. 314, Issue 5801, pp. 925
DOI: 10.1126/science.1130419

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Madin et al. (Reports, 12 May 2006, p. 897) reported that escalation has not been an important cause of biological change throughout the history of life. However, they evaluated the escalation hypothesis with inappropriate data. First, global-scale data integrate heterogeneous signals that obscure the economic context of life. Second, diversity data cannot yield information about selection and adaptation.

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