Combining Logistic Models with Multivariate Methods for the Rapid Biological Assessment of Rivers Using Macroinvertebrates |
| |
Authors: | S V Oliveira R M V Cortes |
| |
Institution: | (1) Departamento Florestal, Universidade de Trás-os-Montes e Alto Douro, Apartment 1013, Vila Real, Portugal |
| |
Abstract: | This work represents an attempt to define a simple method to classify the relative degree of disturbance of sites in lotic
systems on the basis of comparison of their faunistic composition with reference sites. Two ecotypes were selected in northern
Portugal where benthic invertebrates were sampled in reaches with different levels of contamination. As a first stage, previous
Geographic Information System information was used to define reference sites in each ecotype. Afterwards, multivariate techniques
and non linear estimation models were combined to assess biological quality. This method allowed us to quantify sites according
to increasing levels of contamination, after the probabilities of occurrence of taxa along a gradient of contamination taking
into account the reference condition. The results suggest that this method is sensitive to organic pollution, easy to interpret,
namely the species tolerance, and could be a good framework to establish regional rankings depending on the ecological impact
of river sites. |
| |
Keywords: | benthic communities biomonitoring ecotypes logistic models multivariate techniques reference sites |
本文献已被 PubMed SpringerLink 等数据库收录! |
|