Population synchrony and environmental variation: an experimental demonstration

Timothy Guy Benton, C. T. Lapsey, A. P. Beckerman

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    Abstract

    Understanding the causes of population synchrony is an important issue for population management. Its study in field populations involves disentangling the effects of dispersal and correlated environmental noise. Here we report on an experimental investigation of the synchronizing effects of noise in closed laboratory populations of a soil mite, Sancassania berlesei. Mite life-histories are highly plastic with respect to resource availability (which is a function of food supply and population density). By varying the food supply we imposed environmental variation. We show that (a) population synchrony is a function of environmental synchrony, (b) perceived population synchrony depends on the life-history stage counted, and (c) average population synchrony tends to be lower than environmental synchrony: even when populations were supplied with food with a correlation of 1.0, the correlation between populations was 0.63 (bootstrapped 95%CI 0.54-0.71). This supports recent theoretical work suggesting that the Moran theorem (indicating that population synchrony equals environmental synchrony) generally overestimates the population synchrony of nonlinear systems.

    Original languageEnglish
    Pages (from-to)236-243
    Number of pages7
    JournalEcology Letters
    Volume4
    DOIs
    Publication statusPublished - 2001

    Keywords

    • dispersal
    • environmental noise
    • environmental stochasticity
    • life-histories
    • mites
    • Moran effect
    • population dynamics
    • SPATIALLY STRUCTURED POPULATIONS
    • CORRELATED ENVIRONMENTS
    • METAPOPULATION DYNAMICS
    • NONLINEARITY
    • DISPERSAL
    • ECOLOGY
    • SCALE
    • NOISE
    • FLUCTUATIONS
    • PERSISTENCE

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