Habitat factors and the presence or absence of otters Lutra lutra in Denmark

摘要: The purpose of the present study was to examine relative influence different habitat factors on ottersLutra lutra (Linnaeus, 1758) and develop a predictive model better understand distribution otter in Denmark. During National Otter Survey 1991 data were collected 19 variables which reflected aspects structure, composition, organic pollution human disturbance. Multiple logistic regression analysis used estimate probabilities presence otters as function one or more explanatory variables. Six (county, pH, water depth, trees, bottom substrate Saprobien-Index) identified. In Denmark, typically consists courses with depths > 1 m over varied bottom, pH 7.0, Saprobien-Index II–III III (indicating slight pollution) no trees banks. Some these reflect highly productive waters. use an indicator good quality and/or aquatic should be care.