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Gewählte Publikation:

Trautwein, C; Schinegger, R; Schmutz, S.
(2013): Divergent reaction of fish metrics to human pressures in fish assemblage types in Europe
HYDROBIOLOGIA. 2013; 718(1): 207-220. FullText FullText_BOKU

Abstract:
Using a large pan-European dataset, we compared least disturbed sites to sites impacted by human pressures across broad river types to assess which aspects of bio-ecological traits of the fish assemblage are most sensitive to alterations of the river ecosystem. To control for variation across river types and large-scale environmental gradients, we began by clustering the least disturbed sites (n = 716) into four homogenous fish assemblage types (FATs) differing by four fish metrics, i.e., lithophilic, rheophilic, omnivorous, and potamodromous fish. We predicted these FATs (headwater streams, medium gradient rivers, lowland rivers, and Mediterranean streams) using environmental variables, i.e., altitude, river slope, temperature, precipitation, latitude, and longitude for impacted sites in our dataset (n = 2,389). Using tests of sensitivity and intensity, 17 fish metrics showed a clear reaction to human pressures. However, 12 metrics responded exclusively within only one of the four FATs. Hence we observed a divergent reaction of fish metrics to human pressures in, e.g., headwater versus lowland rivers. Type-specific reactions are useful in customizing impact assessment for particular river types. It is of primary importance to understand the comparative sensitivity and efficiency of fish-based indicators of water quality for detecting human-induced degradation of river ecosystems.
Autor/innen der BOKU Wien:
Schinegger Rafaela
Schmutz Stefan
Trautwein Clemens
BOKU Gendermonitor:


Find related publications in this database (Keywords)
Fish
Trait
Assemblage metrics
Human pressure
River type
European running waters
Impact


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