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Reference Category Journals
DOI 10.1007/s10452-013-9428-1
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Title (Primary) Reduced drift activity of two benthic invertebrate species is mediated by infochemicals of benthic fish
Author Schäffer, M.; Winkelmann, C.; Hellmann, C.; Benndorf, J.
Journal Aquatic Ecology
Year 2013
Department ASAM; FLOEK
Volume 47
Issue 1
Page From 99
Page To 107
Language englisch
Keywords Drift; Baetis; Gammarus; Benthivorous fish; Kairomone; Streams
UFZ wide themes RU2;
Abstract Regulating mobility by actively entering the drift under imminent predation risk is an avoidance strategy employed by aquatic macroinvertebrate species that is widely accepted within the scientific community. This response was most evident with respect to diurnal predators that feed in the water column, such as many salmonids. We investigated the role of the nocturnal benthivorous gudgeon [Gobio gobio (L.)] on the drift activity of twomacroinvertebrate species known to display this behaviour: Baetis rhodani (PICTET) and Gammarus pulex (L.). Laboratory drift experiments using gudgeon kairomones were conducted with the results determining significant altered activity in the presence of gudgeon kairomones for both macroinvertebrate species. B. rhodani showed reduced drift activity in the kairomone treatment compared to the kairomone-free control, with a distinct nocturnal pattern being observed for both. G. pulex shifted from a similar day/night movement pattern to a nocturnal movement pattern with decreased activity during the day. Reduce activity during the day, whilst maintaining normal activity at night would not reduce the probability of encountering a nocturnal predator under natural conditions and therefore appears to not be a meaningful anti-predator response. To assess the relevance of these findings under natural conditions, we compared the experimental results with drift measurements from field observations. These show a significant reduction in drift activity for G. pulex and slight tendencies for reduced night-time drift for B. rhodani, under seasonal variations. We conclude that the behaviour in response to the physical contact or the hydrodynamic stimuli of nocturnal predators is the most likely explanation for the differences between the results from our laboratory experiment and the field observation. We further discuss that the observed migration patterns might have different species specific consequences for density stabilisation on a population level.

Persistent UFZ Identifier
Schäffer, M., Winkelmann, C., Hellmann, C., Benndorf, J. (2013):
Reduced drift activity of two benthic invertebrate species is mediated by infochemicals of benthic fish
Aquat. Ecol. 47 (1), 99 - 107