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Title of Journal: Aquat Sci

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Abbravation: Aquatic Sciences

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SP Birkhäuser Verlag Basel

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DOI

10.1007/bf00808195

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1420-9055

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Effectiveness of different types of block ramps fo

Authors: Denise Weibel Armin Peter
Publish Date: 2012/07/25
Volume: 75, Issue: 2, Pages: 251-260
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Abstract

Rivers are worldwide highly fragmented due to human impacts This fragmentation has a negative effect on fish movement and dispersal Many artificial barriers such as river bed sills and small weirs are nowadays replaced by block ramps in order to reestablish longitudinal connectivity for fish in rivers and streams We studied the upstream passage of several fish species on different types of block ramps with slopes between 36 and 134  We conducted translocation experiments in the field based on markrecapture and on the use of PITtags Temporal movement patterns were observed by an instream antenna Hydraulic and morphological characteristics of block ramps were measured and compared with fish passage efficiency Our results clearly showed that upstream passage efficiency differs between fish species size classes and block ramps We observed that brown trout Salmo trutta fario performed better than bullhead Cottus gobio and several cyprinid species on the same block ramps Passage efficiency of brown trout and chub Leuciscus cephalus was sizeselective with smallsized individuals being less successful For brown trout sizeselectivity became more relevant with increasing slope of ramp We conclude that block ramps with slopes of 5  are ineffective for the smallsized cyprinid species and that vertical drops within steppool ramps can hinder successful upstream passage of bullheadWe thank B GermannArnold and other numerous helpers for their assistance in the field We further thank M Studer and A Schleiss who helped to conduct or plan the hydraulic and morphologic measurements The manuscript greatly benefitted from the comments of S Angelone and O Seehausen We acknowledge two anonymous reviewers for their valuable comments and suggestions The present study was part of the interdisciplinary project “Integrated River Management” and was financed by the Swiss Federal Office for the Environment FOEN

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