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dc.contributor.authorDahlgren, Johan P.
dc.contributor.authorColchero, Fernando
dc.contributor.authorJones, Owen R.
dc.contributor.authorØien, Dag Inge
dc.contributor.authorMoen, Asbjørn
dc.contributor.authorSletvold, Nina
dc.date.accessioned2016-11-30T11:15:45Z
dc.date.accessioned2017-02-16T13:22:24Z
dc.date.available2016-11-30T11:15:45Z
dc.date.available2017-02-16T13:22:24Z
dc.date.issued2016
dc.identifier.citationProceedings of the Royal Society of London. Biological Sciences 2016, 283nb_NO
dc.identifier.issn1471-2954
dc.identifier.urihttp://hdl.handle.net/11250/2431088
dc.description.abstractThe dominant evolutionary theory of actuarial senescence—an increase in death rate with advancing age—is based on the concept of a germ cell line that is separated from the somatic cells early in life. However, such a separation is not clear in all organisms. This has been suggested to explain the paucity of evidence for actuarial senescence in plants. We used a 32 year study of Dactylorhiza lapponica that replaces its organs each growing season, to test whether individuals of this tuberous orchid senesce. We performed a Bayesian survival trajectory analysis accounting for reproductive investment, for individuals under two types of land use, in two climatic regions. The mortality trajectory was best approximated by a Weibull model, showing clear actuarial senescence. Rates of senescence in this model declined with advancing age, but were slightly higher in mown plots and in the more benign climatic region. At older ages, senescence was evident only when accounting for a positive effect of reproductive investment on mortality. Our results demonstrate actuarial senescence as well as a survival–reproduction trade-off in plants, and indicate that environmental context may influence senescence rates. This knowledge is crucial for understanding the evolution of demographic senescence and for models of plant population dynamics.nb_NO
dc.language.isoengnb_NO
dc.publisherThe Royal Societynb_NO
dc.titleActuarial senescence in a long-lived orchid challenges our current understanding of ageingnb_NO
dc.typeConference objectnb_NO
dc.typeJournal articlenb_NO
dc.date.updated2016-11-30T11:15:45Z
dc.source.volume283nb_NO
dc.source.journalProceedings of the Royal Society of London. Biological Sciencesnb_NO
dc.source.issue1842nb_NO
dc.identifier.doi10.1098/rspb.2016.1217
dc.identifier.cristin1406357
dc.description.localcodeauthor postprint available 16 November 2017nb_NO


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