Abstract
Animal prey has developed a variety of behavioural strategies to avoid predation. Many fish species form shoals in the open water or seek refuge in structurally complex habitats. Since anti-predator strategies bear costs and are energy-demanding, we hypothesised that the nutritional state of prey should modify the performance level and efficiency of such strategies. In aquaria either containing or lacking a structured refuge habitat, well-fed or food-deprived juvenile roach (Rutilus rutilus) were exposed to an open-water predator (pikeperch, Sander lucioperca). Controls were run without predators. In the presence of the predator, roach enhanced the performance of the anti-predator strategy and increased the use of the refuge habitat whereby food-deprived roach were encountered more often in the structure than well-fed roach. Nonetheless more starved than well-fed roach were fed upon by the predator. In the treatments offering only open-water areas, roach always formed dense shoals in the presence of the predator. The shoal density, however, was lower in starved roach. Starving fish in shoals experienced the highest predation mortality across all experimental treatments. The experiment confirmed the plasticity of the anti-predator behaviour in roach and demonstrated that food deprivation diminished the efficiency of shoaling more strongly than the efficiency of hiding. The findings may be relevant to spatial distribution of prey and predator–prey interactions under natural conditions because when prey are confronted with phases of reduced resource availability, flexible anti-predator strategies may lead to dynamic habitat use patterns.
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Acknowledgements
We are grateful to L. Scharlow for technical assistance and to two anonymous referees who provided helpful comments on the manuscript. This study was funded by the Country Office of Consumer Protection, Agriculture and Land Rearrangement of Brandenburg within the Financial Instrument for Adjusting Fisheries (EG 1263/1999).
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Huckstorf, V., Lewin, WC., Mehner, T. et al. Performance level and efficiency of two differing predator-avoidance strategies depend on nutritional state of the prey fish. Behav Ecol Sociobiol 63, 1735–1742 (2009). https://doi.org/10.1007/s00265-009-0790-x
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DOI: https://doi.org/10.1007/s00265-009-0790-x