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• W3138980574 startingPage "e10858" @default.
• W3138980574 abstract "Many studies of birds have indicated that offspring sex ratios can vary with environmental and parental traits. On the basis of long-term research, we first evaluated the possible influence of parental age difference and brood characteristics on offspring sex and fitness in multi-brooded Blackbirds Turdus merula.The study was conducted in the city-centre Stefan Żeromski Park in Szczecin, NW Poland, where the local population of Blackbirds has been studied since 1996. Data on the offspring sex and fitness were collected in five years, 2005-2007 and 2016-2017. During the breeding season we inspected the study area to locate the pairs' territories and to track their nests and clutches.We found that the overall sex ratio did not differ statistically from 50:50, but that younger females bonded with older mates did tend to produce more sons, probably because of the greater fitness of male descendants. Accordingly, the sons' breeding success increased with the father's age, but this relationship was close to non-linear, which may indicate that the transgenerational effect of paternal senescence could negatively affect progeny fitness despite the high-quality of older fathers. Older females mated with younger males produced more daughters, which could have been due to the lesser attractiveness of the males and the mothers' poorer condition caused by accelerated senescence. We found that neither offspring hatching sequence nor hatching date or clutch sequence were significant for sex determination.We consider that in our Blackbird population, parental age could make a more significant contribution to shaping offspring sex and reproductive success." @default.
• W3138980574 created "2021-03-29" @default.
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• W3138980574 date "2021-03-23" @default.
• W3138980574 modified "2023-09-24" @default.
• W3138980574 title "The effects of parental age difference on the offspring sex and fitness of European blackbirds" @default.
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• W3138980574 doi "https://doi.org/10.7717/peerj.10858" @default.
• W3138980574 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7996069" @default.
• W3138980574 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33828905" @default.
• W3138980574 hasPublicationYear "2021" @default.
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