Why disturbances can be predictable: a perspective on the definition of disturbance in streams

Title and Publication Details

  • Title: Why disturbances can be predictable: a perspective on the definition of disturbance in streams

  • Author: N. Leroy Poff

  • Affiliation: Department of Zoology, University of Maryland, College Park, Maryland 20742-4415 USA

  • Publication: Journal of the North American Benthological Society, 1992, Volume 11, Issue 1, Pages 86-92

  • Publisher: The North American Benthological Society

Abstract Summary

Resh et al. (1988) proposed that disturbances in lotic ecosystems are inherently "unpredictable." This view introduces complications regarding our understanding of disturbances in streams. Poff critiques this notion through four main points related to hydrologic disturbances, particularly spates. First, Poff challenges the reliance on statistical definitions of predictability from Resh et al. and emphasizes the need for physical-based measures. Second, he argues that the adaptation of lotic species to predictable hydrologic events lacks empirical support. Third, he warns that defining disturbances as necessarily unpredictable may lead to tautological reasoning. Lastly, Poff advocates for making clearer distinctions between ecological and evolutionary responses to disturbances.

Introduction to Disturbance

  1. Communication in Ecology: Clear definitions are vital in ecological discourse to avoid misunderstandings, particularly with complex phenomena like disturbance.

    • Ambiguities: Definitions can vary due to philosophical perspectives or complexities inherent in ecological phenomena.

    • Examples: Terms like