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Movement and home range in relation to dominance; a telemetry study on brown trout Salmo trutta

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Abstract:

By combining behavioural observations on adult resident brown trout Salmo trutta in the laboratory with radio telemetry studies in a natural stream, information on movement and space use in relation to social status was obtained. Dominant individuals moved longer distances and also tended to have larger home ranges than subordinates during the summer. In general, home ranges were larger during daytime than at night. Fish were not strictly territorial since the average overlap in interquartile range was 36% during the summer. During the spawning period, the brown trout moved to specific spawning areas resulting in an increased overlap (89%) in space use. Subordinate individuals now tended to increase both home range and interquartile range and were also less frequently observed in spawning areas relative to dominants.

Keywords: brown trout; dominance; habitat preference; home range; movement; telemetry

Document Type: Regular Paper

DOI: http://dx.doi.org/10.1111/j.1095-8649.2006.01299.x

Affiliations: 1: NINA, Norwegian Institute for Nature Research, Tungasletta 2, NO-7485, Trondheim, Norway 2: Department of Zoology, Animal Ecology, University of Göteborg, Box 463, SE-405 30 Göteborg, Sweden 3: Institute of Freshwater Research, Swedish Board of Fisheries, Stångholmsvägen, SE-178 98 Drottningholm, Stockholm, Sweden

Publication date: January 1, 2007

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