Detecting compensatory dynamics in competitive communities under environmental forcing

Esa Ranta, Veijo Kaitala, Mike S. Fowler, Jouni Laakso, Lasse Ruokolainen, Robert O'Hara

    Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

    Abstrakti

    Competition is assumed to generate compensatory dynamics where an increase in one species is compensated by a decrease in others. Recently, using a community covariance technique, Houlahan et al. found that compensatory dynamics are only visible in 25-30% of natural communities studied. The study was based on scoring the sum of covariances of population densities. In contrast to the theory, and as a cautionary reminder to the interpretation of natural time series data, we show that negative community covariance can be absent even in strongly competitive communities and can be found present in communities without competitive interactions. Precise knowledge of various features of the underlying species' biology and characteristics of the environmental variation is required before community covariance can be correctly interpreted as a proxy for the importance of competition or environmental forcing in driving community fluctuations. Other tools may therefore be more appropriate, e.g. explicit modelling of competition using modern time series analytical tools.
    Alkuperäiskielienglanti
    LehtiOikos
    Vuosikerta117
    Numero12
    Sivut1907-1911
    Sivumäärä5
    ISSN0030-1299
    DOI - pysyväislinkit
    TilaJulkaistu - 2008
    OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä, vertaisarvioitu

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