Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 372094
Title Sex ratio comparisons between nestlings and dead embryos of the Sparrowhawk Accipiter nisus
Author(s) Burg, A.B. Van den; Diermen, J. Van; Müskens, G.J.D.M.; Rijn, S. van; Zollinger, R.
Source Ibis 144 (2002)1. - ISSN 0019-1019 - p. E39 - E44.
Department(s) Centre for Ecosystem Studies
Publication type Refereed Article in a scientific journal
Publication year 2002
Keyword(s) seasonal-variation - birds - broods
Abstract Sex ratios that differ from unity have been reported for several bird species, but are poorly understood. Skewed sex ratios may originate at ovulation (primary sex ratio) or arise through differential mortality between the sexes (secondary sex ratio). To estimate the primary sex ratio from nestlings is difficult because in some nests not all the offspring can be sexed. Both when including and excluding such nests, there is a risk of overestimating the proportion of the better-surviving sex. Here we sexed dead Sparrowhawk embryos to determine whether unhatched eggs affect primary sex ratio estimates that are based on nestling data. In nests in which embryo mortality occurred, there was up to a 9% discrepancy in the primary sex ratio estimates based on nestlings alone compared to nestlings and dead embryos together. There was no evidence that these differences were based on sex-specific causes of mortality of embryos
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