Doi
10.5431/aramit2502
Autor

Armbruster J

Jahr
2003
Titel

Untersuchungen zur Spinnenfauna (Araneae) an Mittelgebirgsbächen und zur Besiedlung neu entstandener Uferstrukturen

Titel übersetzt

The spider community (Araneae) of low mountains streams and investigations on the colonization of newly-developed gravel bars

Ausgabe

Heft 25

Seiten
17-37
Abstract

In 2000 and 2001 the spider communities along ten low mountainous streams in Thuringia, Hesse and Lower Saxony were studied. Pitfall traps were set along a perpendicular transect extending from close to the water's edge to a distance of about 10-30 m away. Additonally, hand collectionwithin defined areas and time-frames was carried out. In order to investigate colonization patterns experimentally, coarse substrate was exposed simultating newly-developed bars. In total 164 species were detected. 138 species were caught only in the pitfall traps of which 75 (54%) species were caught not only in grassland but also in other floodplain habitats. 19 speciese were restricted to unvegetated banks or open stream bars. 12 species had a significantly higher abundance along restored sections compared to sections which are still regulated, and therefore would be positively influenced by increased fluvial dynamics whereas no species showed a significantly reduced abundance in response to restoration. Oedothorax agrestis, Pirata knorri and Pirata latitans are regarded as typical for the riparian spider community of low mountainous streams.

Keywords

Araneae; stream restoration; gravel bars; floodplain density; colonization