A. Szlauer-Łukaszewska, P. Buczyński, J. Pakulnicka
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In search of suitable habitats for water beetles (Insecta: Coleoptera) within a heavily transformed river system
The Odra is a large, regulated river, along which many groynes have been built. There are few publications examining how groynes affect the functioning of a river. We investigated the effect of these hydro-engineering structures on the water beetle fauna of a river subject to strong
human pressure. The species composition, assemblages, functional and ecological groups of these beetles in groyne fields were compared with those of oxbows in the Odra valley. We demonstrated that the groyne fields were highly beneficial for water beetle development, offering highly suitable
alternative habitats to oxbows which, though natural, are sensitive and endangered habitats in river valleys. The numerically dominant species in the groyne fields were rheophiles, which are typical of weakly eutrophic, well-oxygenated oxbows. Species-wise, eurytopes were the most important
beetle assemblage. Macrophytes and organic matter were the factors governing the occurrence of saprophages and polyphages, which provide plentiful food resources for the predominating predators in these habitats. Either the pH, visibility, temperature, hardness and O2 both the vegetation,
water depth, breadth of the littoral of the two habitat types were key to the beetles' distribution. The presence of groyne fields has rendered the species richness of the Odra's water beetles comparable with that of large, natural rivers, which amply demonstrates that not all anthropogenic
transformations of habitats are inherently negative.
期刊介绍:
Folia Biologica (Kraków) is an international online open access journal accepting original scientific articles on various aspects of zoology: phylogeny, genetics, chromosomal studies, ecology, biogeography, experimental zoology and ultrastructural studies. The language of publication is English, articles are assembled in four issues per year.