local environmental effects and spatial effects in macroecological studies using mapped abundance classes: the case of the rook corvus frugilegus in scotland.1. the study of the spatial pattern of species abundance is complicated by statistical problems, such as spatial autocorrelation of the abundance data, which lead to the confusion of environmental effects and dispersal. 2. atlas-derived data for the rook in scotland are used as a case study to propose an approach for assessing the likely contribution of dispersal and local environmental effects, based on a bayesian conditional autoregressive (car) approach. 3. the availability of moist grassland ...200616922849
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