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Spatially-explicit population models allow a link between demography and the landscape. We developed a spatially-explicit simulation model for the red-cockaded woodpecker, Picoides borealis, an endangered and territorial cooperative breeder endemic to the southeastern United States. This kind of model is especially appropriate for this species because it can incorporate the spatial constraints on...
Foula (Shetland) holds one of the largest and densest Arctic skua Stercorarius parasiticus colonies in the UK and the largest colony of great skuas Catharacta skua in the world. The distribution of Arctic skua territories on Foula changed markedly between 1976 and 1994, with a disproportionately large decline occurring in most of the northern half of the island. Examination of breeding data collected...
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