The Effect of Release Time On the Migratory Behaviour of Baltic Salmon (Salmo Salar): Influence of an Annual Time Program

The Effect of Release Time On the Migratory Behaviour of Baltic Salmon (Salmo Salar): Influence... THE EFFECT OF RELEASE TIME ON THE MIGRATORY BEHAVIOUR OF BALTIC SALMON (SALMO SALAR): INFLUENCE OF AN ANNUAL TIME PROGRAM by TORLEIF ERIKSSON1)2) (Department of Animal Ecology, University of UmeÅ, S-901 87 UmeÅ, Sweden) (With 3 Figures) (Acc. 20-VI-1988) Introduction Migration is often defined as adaptive long-distance movements that occur predictably in the life cycle of a species (SMITH, 1985). By these movements the animal can benefit from spatial and temporal differences in resource distribution, and hereby fitness is increased. Mechanisms for the proper timing of migration confer adaptive advantages (SMITH, 1985). A variety of organisms have evolved mechanisms to adjust their behaviour to seasonal events. Internal timing devices such as circannual rhythms, have been demonstrated in homotherms as well as poikilotherms (GWINNER, 1977). These rhythms have been shown to affect both reproductive cycles and migratory behaviour (PENGELLY, 1974). In long distance migrating birds circannual rhythms are important in initiating migration at appropriate times of the year (GWINNER, 1977). Furthermore endogenous time-programs can also affect the temporal course and direction of movements in migrating birds (GWINNER & WILTSCHKO, 1978). Similarly, in the Baltic salmon (Salmo salar L.) an endogenous annual timing program appears to affect seasonal adaptions 1) http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Behaviour Brill

The Effect of Release Time On the Migratory Behaviour of Baltic Salmon (Salmo Salar): Influence of an Annual Time Program

Behaviour , Volume 108 (1-2): 10 – Jan 1, 1989

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Publisher
BRILL
Copyright
© 1989 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0005-7959
eISSN
1568-539X
D.O.I.
10.1163/156853989X00024
Publisher site
See Article on Publisher Site

Abstract

THE EFFECT OF RELEASE TIME ON THE MIGRATORY BEHAVIOUR OF BALTIC SALMON (SALMO SALAR): INFLUENCE OF AN ANNUAL TIME PROGRAM by TORLEIF ERIKSSON1)2) (Department of Animal Ecology, University of UmeÅ, S-901 87 UmeÅ, Sweden) (With 3 Figures) (Acc. 20-VI-1988) Introduction Migration is often defined as adaptive long-distance movements that occur predictably in the life cycle of a species (SMITH, 1985). By these movements the animal can benefit from spatial and temporal differences in resource distribution, and hereby fitness is increased. Mechanisms for the proper timing of migration confer adaptive advantages (SMITH, 1985). A variety of organisms have evolved mechanisms to adjust their behaviour to seasonal events. Internal timing devices such as circannual rhythms, have been demonstrated in homotherms as well as poikilotherms (GWINNER, 1977). These rhythms have been shown to affect both reproductive cycles and migratory behaviour (PENGELLY, 1974). In long distance migrating birds circannual rhythms are important in initiating migration at appropriate times of the year (GWINNER, 1977). Furthermore endogenous time-programs can also affect the temporal course and direction of movements in migrating birds (GWINNER & WILTSCHKO, 1978). Similarly, in the Baltic salmon (Salmo salar L.) an endogenous annual timing program appears to affect seasonal adaptions 1)

Journal

BehaviourBrill

Published: Jan 1, 1989

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