Migratory behaviour of Baltic salmon (Salmo salar L.): adaptive significance of annual cycles

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Fältnamn	Indikatorer	Metadata
000		04258nam a2200421 4500
001		oai:DiVA.org:umu-100715
003		SwePub
008		150306s1988 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
020		a 9171743227q print
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1007152 URI
040		a (SwePub)umu
041		a engb eng
042		9 SwePub
072	7	a vet2 swepub-contenttype
072	7	a dok2 swepub-publicationtype
100	1	a Eriksson, Torleif,d 1955-u Umeå universitet,Ekologi och geovetenskap4 aut
245	1 0	a Migratory behaviour of Baltic salmon (Salmo salar L.) :b adaptive significance of annual cycles
264	1	a Umeå :b Umeå universitet,c 1988
300		a 13 s.
338		a electronic2 rdacarrier
500		a Diss. (sammanfattning) Umeå : Umeå universitet, 1988, härtill 5 uppsatser
520		a This thesis evaluates the adaptive significance of annual cycles on the migratory behaviour of Baltic salmon (Salmo salar L.). The studies have included field experiments as well as laboratory studies gf maturity and migratory behaviour patterns of smolts and postsmolts mainly from the Angerman river population.Contrasting to the phenotypical elasticity in life-history traits, Baltic salmon was found to have a rather strict temporal organization of their annual behavioural patterns. Two year old smolted Baltic salmon showed drastic differences in migratory behaviour when compared in tanks containing either fresh or brackish water. Freshwater kept fish showed an annual cycle where downstream displacement in the upper water column was followed by a stationary behaviour, indicating a readaption to a freshwater life. Fish in brackish water behaved as a migratory fish throughout tne study. Baltic salmon also showed differences in maturation patterns in fresh and brackish water. Three summer old males detained in freshwater all matured sexually the following autumn. If transferred to sea and kept in net- pens a low proportion matured, mainly previously matured males. Furthermore there was a size- dependent relationship of sexual rematuration. Many small previously matured males did not migrate, similarly small previolusly matured males were unable to respond to shifts in the environment. With larger size the alternatives of sexual maturation and high growth rate wi more related to the environmental conditions the fish experienced.A hypothesis has been tested assuming that Baltic salmon migration is influenced by an annual time program. According to the hypothesis the migratory distance covered in the Baltic should be a result of a migratory activity sequence rather than a definite goal orientation. Fish detained before release generally showed a shorter distance between release point and area of recapture compared to fish released at normal time of smoltrun. The migratory distance appeared to be inversly related to the period of delay before release. A seasonal difference in migratory propensity was recorded.An instantaneous mortality curve for Baltic salmon during seaward migration and early sea-phase was estimated based on recapture data on sequentially related fish. The weekly mortality rate decreased from an initial mean of 271 during onset of migration, to 3.51 in mean during autumn. The high risk of mortality during the first part of migration indicated that strong selective forces act on a precise seasonal timing of migration.
650	7	a NATURVETENSKAPx Biologix Ekologi0 (SwePub)106112 hsv//swe
650	7	a NATURAL SCIENCESx Biological Sciencesx Ecology0 (SwePub)106112 hsv//eng
653		a Migratory behaviour
653		a annual cycles
653		a Baltic salmon
653		a Salmo salar
653		a annual time program
653		a swimming behaviour
653		a mortality
653		a maturity
653		a life history
700	1	a Eriksson, Lars-Ove,c professoru Umeå universitet,Ekologi och geovetenskap4 ths0 (Swepub:umu)?
700	1	a Groot, Kees,c Dr.u Nanaimo, Canada4 opn
710	2	a Umeå universitetb Ekologi och geovetenskap4 org
856	4	u https://umu.diva-portal.org/smash/get/diva2:796855/FULLTEXT02.pdfx primaryx Raw objecty fulltext
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-100715

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