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Detection of conspecific and heterospecific alarm signals by juvenile pumpkinseed under weak acidic conditions

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Under neutral (pH 7·0) conditions, juvenile pumpkinseed Lepomis gibbosus exhibited significant antipredator responses, of similar intensities, to the chemical alarm cues of conspecifics, an allopatric congener the green sunfish Lepomis cyanellus and the artificial alarm cue of a sympatric prey guild member (Cyprinidae, hypoxanthine-3-N-oxide). Under weakly acidic conditions (pH 6·0), however, no increase in antipredator behaviour was seen in response to hypoxanthine-3-N-oxide and a quantitatively weaker response was found in response to conspecific and congener cues, suggesting that the use of chemical alarm cues by some prey fishes may be impaired by acid precipitation.

Keywords: acid rain; antipredator behaviour; centrarchids; chemical alarm cue; hypoxanthine-3-N-oxide; pumpkinseed

Document Type: Research Article

DOI: http://dx.doi.org/10.1046/j.1095-8649.2003.00230.x

Affiliations: 1: Department of Biology, Concordia University, 7141 Sherbrooke St W., Montreal, Quebec, H4B 1RS, Canada and 2: Department of Chemistry, Science and Engineering Center, Union College, Schenectady NY, 12308, U.S.A.

Publication date: November 1, 2003

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