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Opercular beat rate for rainbow darters Etheostoma caeruleum exposed to chemical stimuli from conspecific and heterospecific fishes

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Opercular beat rates of rainbow darters Etheostoma caeruleum were used as a measure of a physiological response to chemical stimulation. Rainbow darters responded significantly to some chemical cues (active and ambush predators, competitors, novel stimuli and to conspecific and heterospecific alarm cues) with increases in opercular movements; neutral cues and novel alarm cues did not elicit significant changes. Changes in opercular movements may be a good bioassay for determining detection of chemical stimuli by rainbow darters.

Keywords: Etheostoma caeruleum; chemical cues; opercular beat rate; rainbow darters

Document Type: Regular Paper


Affiliations: Department of Biology, Missouri State University, 901 S. National Avenue, Springfield, MO 65804, U.S.A.

Publication date: July 1, 2006


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