Abstract
We subjected fish from regions of high and low levels of predation pressure in four independent streams to a mild stressor and recorded their opercular beat rates. Fish from low-predation areas showed higher maximum, minimum and mean opercular beat frequencies than fish from high-predation regions. The change in opercular beat frequency (scope) was also significantly greater in fish from low- than in fish from high-predation regions. Under normal activity levels, however, low predation fish showed a reduced opercular beat frequency, which may be indicative of reduced activity levels or metabolic rate. Opercular beat frequency was negatively correlated with standard length as one would expect based on higher metabolic rates in smaller fish. We suggest that these contrasting stress responses are most likely the result of differential exposure to predators in fish from high- and low-predation areas. We argue that reduced stress responses in high-predation areas evolved to prevent excessive energy expenditure by modulating the fright response.
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Acknowledgements
We thank the Smithsonian Tropical Research Institute for their continued support and Fiona Burgess for her aid with husbandry. Thanks also to Felicity Brown for her help collecting the fish. The fish were collected and exported under licence from the Panamanian authorities (ANAM permit# 31503). This work was funded by NERC grant no NER/A/S/01/00608.
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Communicated by G. Heldmaier
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Brown, C., Gardner, C. & Braithwaite, V.A. Differential stress responses in fish from areas of high- and low-predation pressure. J Comp Physiol B 175, 305–312 (2005). https://doi.org/10.1007/s00360-005-0486-0
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DOI: https://doi.org/10.1007/s00360-005-0486-0