Adaptive Secondary Sex Ratio Adjustments via Sex-Specific Infanticide in a Bird
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چکیده
منابع مشابه
Adaptive Secondary Sex Ratio Adjustments via Sex-Specific Infanticide in a Bird
Infanticide is easiest to understand when it involves killing the offspring of others [1], but a parent may also kill its own offspring if the sacrifice of currently dependent young leads to higher survival of brood mates [2] or an improvement in the parent's likely future reproduction [3]. However, sex-specific infanticide by parents of their own offspring, although occurring in some human soc...
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To our knowledge, there is, so far, no evidence that incubation temperature can affect sex ratios in birds, although this is common in reptiles. Here, we show that incubation temperature does affect sex ratios in megapodes, which are exceptional among birds because they use environmental heat sources for incubation. In the Australian brush-turkey Alectura lathami, a mound-building megapode, mor...
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If parental allocation to each offspring sex has the same cost/benefit 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-fledgling 1) sex ratio, 2) body condition and 3) sex-differential mortality in a population of the glossy ibis Plegadis falcinellus, in...
متن کاملFacultative and non-facultative sex ratio adjustments in a
15 If parental allocation to each offspring sex has the same cost/benefit ratio, Fisher's 16 hypothesis predicts a sex ratio biased towards the cheaper sex. However, in 17 dimorphic birds there is little evidence for this, especially at hatching. We 18 investigated the pre-fledgling (i) sex ratio, (ii) body condition and (iii) sex19 differential mortality in a population of the glossy ibis (Ple...
متن کاملGonadotrophin and the human secondary sex ratio.
A review of published reports showed that the sex ratio (proportion of boys) was low among infants conceived after ovulation had been induced. The difference between the observed sex ratio and an expected one of 0 . 514 was highly significant. These findings suggest that maternal gonadotrophin concentrations at the time of conception directly affect the sex of the zygote.
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ژورنال
عنوان ژورنال: Current Biology
سال: 2011
ISSN: 0960-9822
DOI: 10.1016/j.cub.2011.08.064