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Combining habitat and biological characterization: ecological validation of the river habitat survey
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Orientador(es)
Resumo(s)
The River Habitat Survey (RHS) is a widespread technique used to characterize the habitats at the fluvial sector level and to
quantify the magnitude of physical disturbances. In this study we tested the ability of this method to discriminate sites along
a gradient of perturbation and to analyse its relation with typological and environmental features.
At the same time, a biological validation of RHS parameters was carried out by crossing the descriptors with three different
aquatic communities (benthic macroinvertebrates, fish, and macrophytes). The Portuguese sector of the Douro basin was the
area selected for this purposes.
Ordination and classification techniques were used to achieve the objectives mentioned, after a reduction of the variables as a
function of their relationships and according to their affinity. The multivariate analysis revealed that the variables associated
with the river corridor were more appropriate to differentiate the sampling stations along the gradient of disturbance.
However, these variables, together with the ones describing the river conditions (together with the RHS derived indices) were
strongly dependent on the typological characteristics.
This work shows an adequate strategy for the characterization of the fluvial habitat with biological data to obtain an integrated
ecological vision.
Descrição
Palavras-chave
RHS biological characterization physical characteristics integral ecological assessment
Contexto Educativo
Citação
"Limnetica". ISSN 0213-8409. 27 (1) (2008) 39-56