Active space of chemical alarm cue in natural fish populations Brian D. Wisenden 1) (Biosciences Department, Minnesota State University Moorhead, 1104 7 th Ave S, Moorhead, MN 56563, USA) (Accepted: 23 November 2007) Summary Chemical cues released from injured fish skin during a predator attack provide reliable infor- mation about the presence of predation risk. Here, I report estimates of the area avoided by littoral fishes after experimental release of chemical alarm cues in two small lakes in northern Minnesota. Minnow traps were labeled chemically with either water (control) or skin extract (chemical alarm cue) made from 2 cm 2 of cyprinid skin (redbelly dace in experiment 1, fat- head minnows in experiment 2). Traps labeled with water were placed 1, 2, or 8 m from traps labeled with alarm cue. After 2 h, water-traps that were either 1 or 2 m distant from an alarm-trap caught significantly fewer fish than water-traps 8 m distant from alarm-traps. Con- specific and heterospecific skin extract produced similar area avoidance by fathead minnows. Redbelly dace showed a larger active space in response to conspecific than heterospecific alarm cues. Brook stickleback showed reduced catches within 2 m of skin extract of fathead
Behaviour – Brill
Published: Jan 1, 2008
Keywords: CHEMICAL ALARM CUES; PREDATOR-PREY INTERACTIONS; ACTIVE SPACE; OSTARIOPHYSI; SCHRECKSTOFF
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