Abstract
Drift as a low-energy cost means of migration may enable stream invertebrates to leave risky habitats or to escape after encountering a predator. While the control of the diurnal patterns of invertebrate drift activity by fish predators has received considerable interest, it remains unclear whether benthivorous fish reduce or increase drift activity. We performed a large-scale field experiment in a second-order stream to test if invertebrate drift was controlled by two benthivorous fish species (gudgeon Gobio gobio and stone loach Barbatula barbatula). An almost fishless reference reach was compared with a reach stocked with gudgeon and loach, and density and structure of the invertebrate communities in the benthos and in the drift were quantified in both reaches. The presence of gudgeon and stone loach reduced the nocturnal drift of larvae of the mayfly Baetis rhodani significantly, in contrast to the findings of most previous studies that fish predators induced higher night-time drift. Both drift density and relative drift activity of B. rhodani were lower at the fish reach during the study period that spanned 3 years. Total invertebrate drift was not reduced, by contrast, possibly due to differences in vulnerability to predation or mobility between the common invertebrate taxa. For instance, Chironomidae only showed a slight reduction in drift activity at the fish reach, and Oligochaeta showed no reduction at all. Although benthic community composition was similar at both reaches, drift composition differed significantly between reaches, implying that these differences were caused by behavioural changes of the invertebrates rather than by preferential fish consumption. The direction and intensity of changes in the drift activity of stream invertebrates in response to the presence of benthivorous fish may depend on the extent to which invertebrate taxa can control their drifting behaviour (i.e. active versus passive drift). We conclude that invertebrate drift is not always a mechanism of active escape from fish predators in natural streams, especially when benthos-feeding fish are present.
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Acknowledgements
We would like to thank Claudia Hellmann, Michael Schäffer and Jana Utikal for helpful discussions and their assistance in the field and the laboratory. Susanne Worischka helped us by analysing the fish guts and controlling fish densities. Thanks also to Susanne Schmidt and anonymous referees for constructive comments on an earlier draught of the manuscript. The Deutsche Forschungsgemeinschaft and the Sächsische Landesstiftung supported the project financially (grant BE 1671/9–1).
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Winkelmann, C., Petzoldt, T., Koop, J.H.E. et al. Benthivorous fish reduce stream invertebrate drift in a large-scale field experiment. Aquat Ecol 42, 483–493 (2008). https://doi.org/10.1007/s10452-007-9101-7
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DOI: https://doi.org/10.1007/s10452-007-9101-7