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Keywords:

  • Analysis of variance;
  • contrasts;
  • herbivore diversity;
  • interaction;
  • predator diversity

Abstract

Douglass et al. (Ecol. Lett., 11, 2008, 1) concluded that grazer diversity and predator diversity have an interactive effect on herbivore abundance in experimental marine mesocosms. Re-analysis of their data fails to support this conclusion, which was apparently based on a statistical miscalculation.