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The small-scale distribution of wide-ranging marine top predators has important impli- cations for environmental management. Skov & Thomsen (2008; Mar Ecol Prog Ser 373:173-186) concluded from a study on Horns Reef, North Sea, that tidally driven upwelling is the most important factor governing distribution of harbour porpoises. For 3 principal reasons such a conclusion cannot be reached through their analysis: (1) the data used are unlikely to be representative of natural and undisturbed conditions of the habitat; (2) the selection of explanatory variables probably led to spu- rious correlations with no general explanatory value; and (3) there was no assessment of statistical uncertainty, model fit, or parsimony, nor any model validation, and thus no indication of the robust- ness of the results. Therefore, there is no statistical support for any general conclusions regarding the factors explaining small-scale distribution of harbour porpoises.

marine ecology. progress series

General models of the spatial distribution of porpoises require representative data and parsimony: Comment on Skov &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp; Thomsen (2008)