Cristin-resultat-ID: 962131
Sist endret: 2. februar 2015 09:51
NVI-rapporteringsår: 2012
Resultat
Vitenskapelig artikkel
2013

Offspring size effects vary over fine spatio-temporal scales in Atlantic salmon (Salmo salar)

Bidragsytere:
  • Grethe Robertsen
  • Helge Skoglund og
  • Sigurd Einum

Tidsskrift

Canadian Journal of Fisheries and Aquatic Sciences
ISSN 0706-652X
e-ISSN 1205-7533
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2013
Publisert online: 2012
Volum: 70
Hefte: 1
Sider: 5 - 12
Open Access

Importkilder

Isi-ID: 000314833000002

Finansiering

  • Norges forskningsråd

    • Prosjektkode: 193818
    • Prosjektkode: 223257

Beskrivelse Beskrivelse

Tittel

Offspring size effects vary over fine spatio-temporal scales in Atlantic salmon (Salmo salar)

Sammendrag

Classic offspring-size theory predicts that a single level of investment per offspring maximizes parental reproductive success in a given environment. Yet, substantial variation in offspring size is often observed among females within populations. Variation at this scale may occur because spatio-temporal variation in stabilizing selection prevents erosion of genetic variation. We tested if patterns of size-specific offspring survival of Atlantic salmon (Salmo salar) varies across location and season within a short stretch of a natural stream by manipulating the emergence timing of juveniles from 12 families with different mean egg sizes and assessing their performance at two locations. The relationship between egg size and juvenile survival varied temporally and spatially: large eggs were advantageous for early emergers in one location, whereas egg size had no effect in the other. Furthermore, the performance of later emerging juveniles did not depend on egg size in either location, possibly because the early emergers had grown or established territories. Thus, selection on offspring size can be complex and vary across short periods of time and small geographic distances, thereby preventing the erosion of genetic variation expected under consistent stabilising selection. breeding timing, density-dependent selection, maternal effects, natural selection

Bidragsytere

Grethe Robertsen

  • Tilknyttet:
    Forfatter
    ved NINA akvatisk naturmangfold ved Norsk institutt for naturforskning
  • Tilknyttet:
    Forfatter
    ved Institutt for biologi ved Norges teknisk-naturvitenskapelige universitet

Helge Skoglund

  • Tilknyttet:
    Forfatter
    ved Uni Research Miljø ved NORCE Norwegian Research Centre AS

Sigurd Einum

  • Tilknyttet:
    Forfatter
    ved Institutt for biologi ved Norges teknisk-naturvitenskapelige universitet
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