INEXPLICABLY FEMALE-BIASED SEX RATIOS INMELITTOBIAWASPS
نویسندگان
چکیده
منابع مشابه
Inexplicably female-biased sex ratios in Melittobia wasps.
The sex ratio behavior of parasitoid wasps in the genus Melittobia is scandalous. In contrast to the prediction of Hamilton's local mate competition theory, and the behavior of numerous other species, their extremely female-biased sex ratios (1-5% males) change little in response to the number of females that lay eggs on a patch. We examined the mating structure and fitness consequences of adju...
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PREMISE OF THE STUDY The development of biased sex ratios in dioecious plant species has been ascribed to either (1) factors influencing differential adult mortality of male and female plants or (2) factors acting at an early life stage that determine seed sex ratio or seedling survival. METHODS To discriminate between these two competing hypotheses, we surveyed sex and age of 379 individuals...
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It has been recognized for some time that the risk of producing maleless clutches should select for a lower than binomial variance in the sex ratio of organisms with female-biased sex ratios, small clutches and breeding groups containing the clutch of a single female. However, to date, precise sex ratios have only been reported for organisms with haplodiploid sex determination, a system which a...
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For vertebrates with temperature-dependent sex determination, primary (or hatchling) sex ratios are often skewed, an issue of particular relevance to concerns over effects of climate change on populations. However, the ratio of breeding males to females, or the operational sex ratio (OSR), is important to understand because it has consequences for population demographics and determines the capa...
متن کاملWhole brood mortality increases the opportunity for female-biased sex ratios under local mate competition
Fisher predicted that sex ratios should be even when the cost of producing each sex is equal, assuming large panmictic populations. Hamilton showed that when individuals breed exclusively in small groups (local mate competition), the sex ratio does not comply with Fisherian theory, but instead favours a female bias. Local mate competition has been suggested to explain female biases most often i...
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ژورنال
عنوان ژورنال: Evolution
سال: 2014
ISSN: 0014-3820
DOI: 10.1111/evo.12451