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Shape variation in a benthic stream fish across flow regimes

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Abstract

Evolution of fish body shapes in flowing and non-flowing waters have been examined for several species. Flowing water can select for fish body shapes that increase steady swimming efficiency, whereas non-flowing water can favor shapes that increase unsteady swimming efficiency. Benthic stream fishes often use areas near the substrate that exhibit reduced or turbulent flow, thus it is unclear which swimming forms would be favored in such environments, and how shape might change across flow regimes. To test the relationship between fish body shape and flow regime in a benthic stream fish, we used geometric morphometric techniques to characterize lateral body shape in mountain sucker (Catostomus platyrhynchus) across flow rates, using stream gradient as an indicator of stream flow. Mountain suckers from low-flow environments were more streamlined, consistent with steady swimming body shapes, whereas mountain suckers from high flows had deeper bodies, consistent with unsteady swimming body shapes. In addition, smaller individuals tended to have more robust body shapes. These patterns are opposite to those predicted for stream fishes in the mid-water column. The benthic stream environment represents a distinct selective environment for fish shape that does not appear to conform to the simple dichotomy of flowing versus non-flowing water.

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Acknowledgments

We thank Mike Whitney for gathering data. We are grateful for the help of a number of undergraduate research assistants. This project was funded through a Mentoring Environment Grant from Brigham Young University. This research was approved by the Institutional Animal Care and Use Committee at Brigham Young University.

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Authors and Affiliations

  1. Department of Biology, Brigham Young University, Provo, UT, 84602, USA

    Peter J. Meyers & Mark C. Belk

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  1. Peter J. Meyers
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  2. Mark C. Belk
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Correspondence to Peter J. Meyers.

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Handling editor: M. Power

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Meyers, P.J., Belk, M.C. Shape variation in a benthic stream fish across flow regimes. Hydrobiologia 738, 147–154 (2014). https://doi.org/10.1007/s10750-014-1926-1

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  • DOI: https://doi.org/10.1007/s10750-014-1926-1

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