4.3 Article

Size-Mediated Effects of Water-Flow Velocity on Riverine Fish Species

期刊

RIVER RESEARCH AND APPLICATIONS
卷 32, 期 3, 页码 390-398

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WILEY
DOI: 10.1002/rra.2847

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allometry; ecological risk assessment; fish occurrence; physical stress; rivers

资金

  1. 7th Framework EU Project 'SOLUTIONS'

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We applied species sensitivity distributions (SSDs), commonly used in chemical risk assessment, to quantify the impact of water-flow velocity on the presence of fish species in a river. SSDs for water-flow velocity were derived from observational field data (maximal velocity at which species occur, V-max) and laboratory measurements (critical swimming velocity, V-crit). By calculating the potentially affected fraction of the fish species of the river Rhine, effects of water-flow velocity on different life stages and guilds were estimated. V-max values for adults were significantly higher than those for juveniles and larvae. At water-flow velocity of 60cms(-1), half of the adults were affected, while half of the non-adult life stages were affected at velocities of 25 to 29cms(-1). There was a positive correlation between body size and fish tolerance to water-flow. As expected, rheophilic species tolerated higher water-flow velocities than eurytopic and limnophilic species. Maximal velocities measured in littoral zones of the Rhine were, on average, 10cms(-1), corresponding to an affected fraction of 2%. An increase in water-flow velocity up to 120cms(-1) as a result of passing vessels caused an increase in affected species to 75%. For a successful ecological river management, the SSD method can be used to quantify the trait-mediated effects of water-flow alterations on occurring species enabling to compare and rank the effects of chemical and physical stress. Copyright (c) 2014 John Wiley & Sons, Ltd.

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