Habitat factors and the presence or absence of otters Lutra lutra in Denmark
| Autor: | Allan Prang, Aksel Bo Madsen |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Pollution
education.field_of_study biology Ecology media_common.quotation_subject Population biology.organism_classification Substrate (marine biology) Otter Geography Habitat Animal ecology biology.animal Animal Science and Zoology Lutra Water quality education Ecology Evolution Behavior and Systematics media_common |
| Zdroj: | Aarhus University |
| ISSN: | 2190-3743 0001-7051 |
| DOI: | 10.4098/at.arch.01-19 |
| Popis: | The purpose of the present study was to examine the relative influence of different habitat factors on ottersLutra lutra (Linnaeus, 1758) and to develop a predictive model to better understand the distribution of the otter in Denmark. During the National Otter Survey in 1991 data were collected on 19 variables which reflected aspects of habitat structure, composition, organic pollution and human disturbance. Multiple logistic regression analysis was used to estimate probabilities of the presence of otters as a function of one or more explanatory variables. Six variables (county, pH, water depth, presence of trees, bottom substrate and Saprobien-Index) were identified. In Denmark, otter habitat typically consists of water courses with depths > 1 m over a varied bottom, with pH > 7.0, Saprobien-Index on II–III to III (indicating slight organic pollution) with no trees on the banks. Some of these variables reflect highly productive waters. The use of the otter as an indicator of good water quality and/or aquatic habitat should be used with care. |
| Databáze: | OpenAIRE |
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