Vis enkel innførsel

dc.contributor.authorBårdsen, Bård-Jørgen
dc.contributor.authorHenden, John-André
dc.contributor.authorFauchald, Per
dc.contributor.authorTveraa, Torkild
dc.contributor.authorStien, Audun
dc.date.accessioned2012-03-28T12:28:45Z
dc.date.available2012-03-28T12:28:45Z
dc.date.issued2011
dc.description.abstractEmpirical work suggest that long-lived organisms have adopted risk sensitive reproductive strategies where individuals trade the amount of resources spent on reproduction versus survival according to expected future environmental conditions. Earlier studies also suggest that climate affects population dynamics both directly by affecting population vital rates and indirectly through long-term changes in individual life histories. Using a seasonal and state-dependent individual-based model we investigated how environmental variability affects the selection of reproductive strategies and their effect on population dynamics. We found that: (1) dynamic, i.e. plastic, reproductive strategies were optimal in a variable climate. (2) Females in poor and unpredictable climatic regimes allocated fewer available resources in reproduction and more in own somatic growth. This resulted in populations with low population densities, and a high average female age and body mass. (3) Strong negative density dependence on offspring body mass and survival, along with co-variation between climatic severity and population density, resulted in no clear negative climatic effects on reproductive success and offspring body mass. (4) Time series analyses of population growth rates revealed that populations inhabiting benign environments showed the clearest response to climatic perturbations as high population density prohibited an effective buffering of adverse climatic effects as individuals were not able to gain sufficient body reserves during summer. Regularly occurring harsh winters ‘harvested’ populations, resulting in persistent low densities, and released them from negative density dependent effects, resulting in high rewards for a given resource allocation.en
dc.identifier.citationOikos 120(2011) nr. 2 s. 245-257en
dc.identifier.cristinIDFRIDAID 532225
dc.identifier.doidoi: 10.1111/j.1600-0706.2010.18597.x
dc.identifier.issn0030-1299
dc.identifier.urihttps://hdl.handle.net/10037/4089
dc.identifier.urnURN:NBN:no-uit_munin_3809
dc.language.isoengen
dc.publisherMunksgaard Forlagen
dc.rights.accessRightsopenAccess
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488en
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488en
dc.titlePlastic reproductive allocation as a buffer against environmental stochasticity : linking life history and population dynamics to climateen
dc.typeJournal articleen
dc.typeTidsskriftartikkelen
dc.typePeer revieweden


Tilhørende fil(er)

Thumbnail
Thumbnail

Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel