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)
Behaviour – Brill
Published: Jan 1, 1989
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera