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Spatial Segregation by Age and Size in Arctic Charr: A Trade-Off between Feeding Possibility and Risk of Predation
Jan Henning L'Abée-Lund, Arnfinn Langeland, Bror Jonsson and Ola Ugedal
Journal of Animal Ecology
Vol. 62, No. 1 (Jan., 1993), pp. 160-168
Published by: British Ecological Society
Stable URL: http://www.jstor.org/stable/5490
Page Count: 9
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1. Arctic charr Salvelinus alpinus underwent phenological and ontogenetic habitat shifts between the epibenthic and pelagic zones in five Norwegian study lakes. Juveniles exploited epibenthic areas until they reached a body length of 13-18 cm when many moved into pelagic waters during summer. 2. Pelagic juvenile Arctic charr had larger age-specific lengths than their epibenthic counterpars, and few juvenile Arctic charr moved from epibenthic to pelagic areas in the presence of large brown trout, the main potential fish predator present. 3. The mean size of the smallest Arctic charr in the uppermost 2 Secchi disc units of the pelagic area was positively correlated with the body size of the largest brown trout that were present, and with the water transparency of the lakes. The size of pelagic charr declined significantly with depth in all but one lake. 4. Our results indicate that juvenile Arctic charr demonstrate a trade-off between food demand and presence of predators, and thereby distribute themselves according to food availability and risk of predation.
Journal of Animal Ecology © 1993 British Ecological Society