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Spatial, environmental and human influences on the distribution of otter (Lutra lutra) in the Spanish provinces by Ana Márcia Barbosa; Raimundo Real; Ana Luz Márquez ; Miguel Ángel Rendón is a Environmental Science article available to read on EtoBox.

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## Abstract In a previous survey of otters (__Lutra lutra__ L. 1758) in Spain, different causes were invoked to explain the frequency of the species in each province. To find common causes of the distribution of the otter in Spain, we recorded a number of spatial, environmental and human variables in each Spanish province. We then performed a stepwise linear multiple regression of the proportion of positive sites of otter in the Spanish provinces separately on each of the three groups of variables. Geographic longitude, January air humidity, soil permeability and highway density were the variables selected. A linear regression of the proportion of otter presence on these variables explained 62.4% of the variance. We then used the selected variables in a partial regression analysis to specify which proportions of the variation are explained exclusively by spatial, environmental and human factors, and which proportions are attributable to interactions between these components. Pure environmental effects accounted for only 5.5% of the variation, while pure spatial and pure human effects explained 18% and 9.7%, respectively. Shared variation among the components totalled 29.2%, of whic

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Author

Ana Márcia Barbosa; Raimundo Real; Ana Luz Márquez ; Miguel Ángel Rendón

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 1366-9516)

Published

2001

Language

EN

Field

Environmental Science (Physical Sciences)