REVERSE SEX-RATIO ADJUSTMENT IN AN APPARENTLY OUTBREEDING WASP,BRACON HEBETOR
نویسندگان
چکیده
منابع مشابه
Haplodiploidy, sex-ratio adjustment, and eusociality.
Hamilton's "haplodiploidy hypothesis" holds that inflated sororal relatedness has promoted altruistic sib rearing in haplodiploids, potentially explaining their apparent predisposition to eusociality. Here, we suggest that haplodiploidy may instead promote eusociality simply by facilitating sex-ratio adjustment. Specifically, haplodiploidy may enable sex-ratio bias toward the more helpful sex, ...
متن کاملConstraints in the evolution of sex ratio adjustment.
When the relative fitness of male and female offspring varies with environmental conditions, evolutionary theory predicts that parents should adjust the sex of their offspring accordingly. Qualitative and even quantitative support for this prediction is striking in some taxa but much less convincing in others. Explaining such variation across taxa in the fit of sex ratio theory remains a major ...
متن کاملHormone-mediated adjustment of sex ratio in vertebrates.
The ability to adjust sex ratios at the individual level exists among all vertebrate groups studied to date. In many cases, there is evidence for facultative adjustment of sex ratios in response to environmental and/or social cues. Because environmental and social information must be first transduced into a physiological signal to influence sex ratios, hormones likely play a role in the adjustm...
متن کاملFemale ambrosia beetles adjust their offspring sex ratio according to outbreeding opportunities for their sons.
Recent studies on the effect of local mate competition (LMC) on sex ratios have focused on the effect of post-dispersal mating success by males. A higher proportion of males is expected to be produced as the potential for outbreeding increases. Here we demonstrate that males of a haplodiploid ambrosia beetle with LMC disperse to seek additional matings, and brood sex ratios increase with outbre...
متن کاملSex choice in plants: facultative adjustment of the sex ratio in the perennial herb Begonia gracilis.
Sex allocation theory predicts that reproducing individuals will increase their fitness by facultatively adjusting their relative investment towards the rarer sex in response to population shifts in operational sex ratio (OSR). The evolution of facultative manipulation of sex ratio depends on the ability of the parents to track the conditions favouring skewed sex allocation and on the mechanism...
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ژورنال
عنوان ژورنال: Evolution
سال: 1989
ISSN: 0014-3820
DOI: 10.1111/j.1558-5646.1989.tb04241.x