Small Populations and Offspring Sex-Ratio Deviations in Eagles
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چکیده
منابع مشابه
Small populations and offspring sex-ratio deviations in eagles.
Stochastic variation of sex ratio has long been appreciated as a potential factor driving small populations to extinction, but it is not the only source of sex-ratio bias in small populations. We examined whether some consequences of sex allocation could affect extinction risk in small populations of size-dimorphic birds such as eagles. We report variations in sex ratio at fledging from a long-...
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tends to have a predictable effect on smoking cessation. However, from a social perspective, it is fairly certain (to within relatively narrow confidence limits) how many cases of lung cancer or cardiac events will be avoided if 10000 persons stop smoking. What this illustrates is that social benefit is more certain than individual benefit. In other words, if we are concerned with a social pers...
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There is evidence that the ratio of the length of the 2nd and 4th digit (2D:4D) is negatively related to prenatal and adult concentrations of testosterone. It has also been reported that high levels of testosterone at conception in both fathers and mothers are associated with an increased sex ratio (proportion of males at birth). It follows from these observations that low values of 2D:4D may b...
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Pre-determining fetal sex is against the random and equal opportunity that both conceptus sexes have by nature. Yet, under a wide variety of circumstances, populations shift their birth sex ratio from the expected unity. Here we show, using fluorescence in situ hybridization, that in a population of pygmy hippopotamus (Choeropsis liberiensis) with 42.5% male offspring, males bias the ratio of X...
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ژورنال
عنوان ژورنال: Conservation Biology
سال: 2009
ISSN: 0888-8892,1523-1739
DOI: 10.1111/j.1523-1739.2009.01215.x