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Integration of Constructed Floodplain Ponds into Nature-Like Fish Passes Supports Fish Diversity in a Heavily Modified Water Body

Aquatic Systems Biology Unit, Department of Life Science Systems, TUM School of Life Sciences, Technical University of Munich, Mühlenweg 22, D-85350 Freising, Germany
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Academic Editor: José Maria Santos
Water 2021, 13(8), 1018; https://doi.org/10.3390/w13081018
Received: 22 February 2021 / Revised: 2 April 2021 / Accepted: 4 April 2021 / Published: 8 April 2021
(This article belongs to the Section Biodiversity and Ecosystem Functioning)
Fish passes facilitate fish movement in fragmented river systems, yet they can also provide important habitat functions. This study investigated the fish community composition of different constructed habitat types (fluvial habitats, floodplain ponds) within fish passes in relation to habitat characteristics in order to deduce recommendations for fish-friendly designs of such structures. Fish community structures within passes differed significantly from those in the main river, comprising a high number of rheophilic species in fluvial habitats (Thymallus thymallus, Hucho hucho, Salmo trutta, Cottus gobio, Chondrostoma nasus, and Barbus barbus), and of stagnophilic species in floodplain ponds (Rhodeus amarus, Scardinius erythrophthalmus, Misgurnus bipartitus, and Tinca tinca). During summer, floodplain ponds also provided important juvenile habitats for the target species C. nasus and B. barbus. Differences between the two habitat types in fish abundance were mostly explained by differences in macrophyte coverage, gravel, boulders, temperature, and current speed. The findings of this study stress the important habitat functions of fish passes. They also suggest that integration of diverse habitat structures, especially of currently hardly considered constructed floodplain ponds into fish passes, can greatly enhance their fish communities and contribute to the restoration of several declining target species of conservation. View Full-Text
Keywords: river restoration; bypass channel; fish conservation; aquatic habitat; floodplain ponds; hydropower; fish stock management; fish migration river restoration; bypass channel; fish conservation; aquatic habitat; floodplain ponds; hydropower; fish stock management; fish migration
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MDPI and ACS Style

Pander, J.; Nagel, C.; Geist, J. Integration of Constructed Floodplain Ponds into Nature-Like Fish Passes Supports Fish Diversity in a Heavily Modified Water Body. Water 2021, 13, 1018. https://doi.org/10.3390/w13081018

AMA Style

Pander J, Nagel C, Geist J. Integration of Constructed Floodplain Ponds into Nature-Like Fish Passes Supports Fish Diversity in a Heavily Modified Water Body. Water. 2021; 13(8):1018. https://doi.org/10.3390/w13081018

Chicago/Turabian Style

Pander, Joachim; Nagel, Christoffer; Geist, Juergen. 2021. "Integration of Constructed Floodplain Ponds into Nature-Like Fish Passes Supports Fish Diversity in a Heavily Modified Water Body" Water 13, no. 8: 1018. https://doi.org/10.3390/w13081018

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