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.
No Supplementary Data
chemical alarm cue;
Document Type: Research Article
Department of Biology, Concordia University, 7141 Sherbrooke St W., Montreal, Quebec, H4B 1RS, Canada and
Department of Chemistry, Science and Engineering Center, Union College, Schenectady NY, 12308, U.S.A.
Publication date: 2003-11-01