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• W2022247951 abstract "If parental allocation to each off spring sex has the same cost/benefi t ratio, Fisher’s hypothesis predicts a sex ratio biased towards the cheaper sex. However, in dimorphic birds there is little evidence for this, especially at hatching. We investigated the pre-fl edgling 1) sex ratio, 2) body condition and 3) sex-diff erential mortality in a population of the glossy ibis Plegadis falcinellus , in southern Spain between 2001 and 2011. We defi ned two age groups for the period between hatching and fl edging. We also compared pre-fl edgling with the autumn sex ratio. Metabolic rates were estimated by the doubly labeled water (DLW) technique to establish that sons (the bigger sex) were 18% more energy demanding than daughters, and to compute the predicted Fisher’s sex ratio (0.465). As population size increased between years, body condition decreased in both sexes, and mortality increased more for daughters than sons prior to fl edging. At the same time, the proportion of males among chicks close to fl edging increased (average sex ratio: 0.606) while the proportion close to hatching decreased (average sex ratio: 0.434, in line with Fisher’s prediction). Furthermore, the proportions of males at fl edging and the following autumn were negatively correlated across years. We suggest that, as population density increased and conditions worsened the larger sex had relatively higher survival. Th ese diff erences in survival produce a shift from a facultative female-biased sex ratio at hatching into a non-facultative male-biased sex ratio of fl edglings. Additionally, the excess of males at fl edging was counterbalanced by sex-related dispersal during the autumn. Overall, glossy ibis sex ratio is a product of a combination of facultative and non-facultative adjustments triggered by environmental conditions, driven by rapid population growth, and mediated by highly interrelated life-history traits such as body condition, mortality, and dispersal." @default.
• W2022247951 created "2016-06-24" @default.
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• W2022247951 date "2015-02-06" @default.
• W2022247951 modified "2023-10-03" @default.
• W2022247951 title "Facultative and non-facultative sex ratio adjustments in a dimorphic bird species" @default.
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• W2022247951 doi "https://doi.org/10.1111/oik.01889" @default.
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