A landscape approach towards ecological integrity of catchments and streams
作者： Johan Törnblom
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摘要: Landscape ecology principles were applied to study how in-stream structures as well terrestrial land cover and use affect the ecological integrity of streams. Focusing on role habitat factors at multiple spatial scales catchments independent variables, macroinvertebrates, brown trout (Salmo trutta) freshwater pearl mussels (Margaritifera margaritifera) used dependent response variables. Special efforts made capture range impacts along gradient from altered near-natural in Europe’s centre north. With 25 Carpathian Mountains Central Europe a landscape laboratory natural experiment design I studied relationships between catchment composition, riparian vegetation, characteristics one hand, benthic macroinvertebrate assemblages other. The most important variables level. usefulness data representing higher taxonomic levels abundance individuals orders Ephemeroptera, Plecoptera Trichoptera, surrogates for species richness was evaluated. identified effective group. Comparison order relation forest water chemistry demonstrated occurrence non-linear cover. Using Swedish showed that it is possible predict viable mussel populations cover, host fish (brown trout). In another positive effect woody debris size streams observed. Altogether these results stress importance adopting scale perspective when assessing riverine landscapes, amount local large (LWD) effects composition use. To support implementation EU policies about good status systematic approach including (1) quantification concept, (2) collaborative communicative bottom-up participatory approaches planning need be combined.
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