Spatial, environmental and human influences on the distribution of otter (Lutra lutra) in the Spanish provinces

摘要: In a previous survey of otters (Lutra lutra L. 1758) in Spain, different causes were invoked to explain the frequency species each province. To find common distribution otter we recorded number spatial, environmental and human variables Spanish We then performed stepwise linear multiple regression proportion positive sites provinces separately on three groups variables. Geographic longitude, January air humidity, soil permeability highway density selected. A presence these explained 62.4% variance. used selected partial analysis specify which proportions variation are exclusively by factors, attributable interactions between components. Pure effects accounted for only 5.5% variation, while pure spatial 18% 9.7%, respectively. Shared among components totalled 29.2%, 10.9% was interaction factors. Human factors globally less variance than ones, but influence higher one. concluded that most occurrences is spatially structured, have more ones; however, structured space, thus can be disruptive. This effect large infrastructures wild populations must taken into account when planning large-scale conservation policies.