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Characterising the temporal variability of the spatial distribution of animals: an application to seabirds at sea ArchiMer
Certain, Gregoire; Bellier, E; Planque, Benjamin; Bretagnolle, V.
Understanding the patterns of spatial and temporal variations in animal abundance is a fundamental question in ecology. Here, we propose a method to quantify temporal variations in animal spatial patterns and to determine the spatial scale at which such temporal variability is expressed. The methodology extends from the approach proposed by Taylor (Taylor, L. R. 1961. Aggregation, variance and the mean. Nature 189: 732-735) and relies on models of the relationship between temporal mean and variance in animal abundance. Repeated observations of the spatial distribution of populations are used to construct spatially explicit models of Taylor's power law. The resulting slope parameters of the Taylor power law provide local measures of the temporal variability...
Tipo: Text Palavras-chave: Temporal variability; Taylor's Power Law; Spatio temporal distribution; Seabirds; Scale dependence; Bay of Biscay.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3523.pdf
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