Groyne-heads as potential summer habitats for juvenile rheophilic fishes in the Lower Oder, Germany
Identifieur interne : 000C12 ( Main/Exploration ); précédent : 000C11; suivant : 000C13Groyne-heads as potential summer habitats for juvenile rheophilic fishes in the Lower Oder, Germany
Auteurs : Antje Bischoff [Allemagne] ; Christian Wolter (biologiste) [Allemagne]Source :
- Limnologica [ 0075-9511 ] ; 2001.
English descriptors
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Abstract
The present study aims to test the hypothesis that artificial structures, the riverward ends of groynes or groyne-heads, function as potential habitats for young rheophilic fish. The investigation was undertaken in summer 1998 on the River Oder, in the Polish-German National Park ‘Lower Oder Valley’, eastern Germany. Fish were caught on groyne-heads using point abundance sampling by electrofishing and compared with specimens collected by the same method in seven additional mesohabitats (navigable side-canal, sandy river bank, riprap, deep groyne, sandy groyne, connected backwater, polder waterbody). Groyne-heads were inhabited by bottom-oriented 0+ rheophilic stone loach Barbatula barbatula (L.) and burbot Lota lota (L.), whereas 0+ rheophilic cyprinid fish were more abundant in shallow-sloped, sandy shoreline mesohabitats. Of all sites investigated, 1+ juveniles were most abundant on groyne-heads, in which the rheophilic group formed a large proportion of the total catch. From our results we conclude that groyne-heads constitute an important habitat for both 0+ and 1+ juvenile rheophilic fish during summer-time, but that its use is limited by the stochastic availability due to varying discharges.
Url:
DOI: 10.1016/S0075-9511(01)80043-8
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The investigation was undertaken in summer 1998 on the River Oder, in the Polish-German National Park ‘Lower Oder Valley’, eastern Germany. Fish were caught on groyne-heads using point abundance sampling by electrofishing and compared with specimens collected by the same method in seven additional mesohabitats (navigable side-canal, sandy river bank, riprap, deep groyne, sandy groyne, connected backwater, polder waterbody). Groyne-heads were inhabited by bottom-oriented 0+ rheophilic stone loach Barbatula barbatula (L.) and burbot Lota lota (L.), whereas 0+ rheophilic cyprinid fish were more abundant in shallow-sloped, sandy shoreline mesohabitats. Of all sites investigated, 1+ juveniles were most abundant on groyne-heads, in which the rheophilic group formed a large proportion of the total catch. 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