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dc.contributor.authorBårdsen, Bård-Jørgen
dc.identifier.citationEcology and Evolution. 2017, 7 5833-5844.nb_NO
dc.description.abstractIf we want to understand how climate change affects long-lived organisms, we must know how individuals allocate resources between current reproduction and survival. This trade-off is affected by expected environmental conditions, but the extent to which density independent (DI) and density dependent (DD) processes interact in shaping individual life histories is less clear. Female reindeer (or caribou: Rangifer tarandus) are a monotocous large herbivore with a circumpolar distribution. Individuals that experience unpredictable and potentially harsh winters typically adopt risk averse strategies where they allocate more resources to building own body reserves during summer and less to reproduction. Such a strategy implies that the females do not reproduce or that they produce fewer or smaller offspring. A risk averse strategy thus results in females with large autumn body reserves, which is known to increase their survival probabilities if the coming winter is harsh. In contrast, females experiencing predictable winters may adopt a more risk prone strategy in which they allocate more resources to reproduction as they do not need as many resources to buffer potentially adverse winter conditions. This study uses a seasonal state-dependent model showing that DD and DI processes interact to affect the evolution of reproductive strategies and population dynamics for reindeer. The model was run across a wide range of different winter climatic scenarios: One set of simulations where the average and variability of the environment was manipulated and one set where the frequency of good and poor winters increased. Both reproductive allocation and population dynamics of reindeer were affected by a combination of DI and DD processes even though they were confounded (harsh climates resulted in lowered density). Individual strategies responded, in line with a risk sensitive reproductive allocation, to climatic conditions and in a similar fashion across the two climatic manipulations. agent-/individual-based model (ABM/IBM), Arctic/SubArctic, convergence, density dependent selection, dynamic optimization, environmental unpredictability, pastoral livelihood, population dynamics, ungulatesnb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.subjectagent-/individual-based model (ABM/IBM)nb_NO
dc.subjectdensity dependent selectionnb_NO
dc.subjectdynamic optimizationnb_NO
dc.subjectenvironmental unpredictabilitynb_NO
dc.subjectpastoral livelihoodnb_NO
dc.subjectpopulation dynamicsnb_NO
dc.titleEvolutionary responses to a changing climate: Implications for reindeer population viabilitynb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.subject.nsiVDP::Zoologiske og botaniske fag: 480nb_NO
dc.subject.nsiVDP::Zoology and botany: 480nb_NO
dc.subject.nsiVDP::Samfunnsvitenskap: 200::Sosialantropologi: 250nb_NO
dc.source.journalEcology and Evolutionnb_NO
dc.relation.projectEU/Nordforsk-funded “Nordic Centre of Excellence” 76915nb_NO
dc.relation.projectNorges forskningsråd: 240280nb_NO

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal