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  • 1.
    Knape, Jonas
    et al.
    Lund University.
    Sköld, Martin
    Örebro universitet, Handelshögskolan vid Örebro universitet.
    Jonzén, Niclas
    Lund University.
    Åkesson, Mikael
    Lund University.
    Bensch, Staffan
    Lund University.
    Hansson, Bengt
    Lund University.
    Hasselquist, Dennis
    Lund University.
    An analysis of hatching success in the great reed warbler Acrocephalus arundinaceus2008Inngår i: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, nr 117, s. 430-438Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Hatching success is a potentially important fitness component for avian species. Previous studies of hatching success in natural populations have primarily focused on effects of inbreeding but a general understanding of variation in hatching success is lacking. We analyse data on hatching success in a population of great reed warblers Acrocephalus arundinaceus in Lake Kvismaren in south central Sweden. The effects of a range of covariates, including three measures of inbreeding as well as effects of classifications in the data (such as identities of individuals), on hatching success are analysed simultaneously. This is done by means of fitting Bayesian binomial mixed models using Markov chain Monte Carlo methods. Using random effects for each individual parent we check for unexplained variation in hatching success among male and female individuals and compare it to effects of covariates such as degree of inbreeding. Model selection showed that there was a significant amount of unexplained variation in hatching probability between females. This was manifested by a few females laying eggs with a substantially lower hatching success than the majority of the females. The deviations were of the same order of magnitude as the significant effect of parent relatedness on hatching success. Whereas the negative effect of parent relatedness on hatchability is an expression of inbreeding, the female individual effect is not due to inbreeding and could reflect maternal effects, that females differ in fertilisation and/or incubation ability, or an over representation of genetic components from the female acting on the early developing embryo.

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