Exposure to high male density causes maternal stress and female-biased sex ratios in a mammal
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چکیده
منابع مشابه
Precise, highly female-biased sex ratios in a social spider.
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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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...
متن کاملInexplicably 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...
متن کاملMale-biased infant sex ratios and patterns of induced abortion.
640 CMAJ, June 14, 2016, 188(9) © 2016 Joule Inc. or its licensors Two linked research papers by Urquia and colleagues examine infant sex selection, a long-standing and controversial topic.1,2 In their first study, the authors investigate birth certificate data to examine skewed infant sex ratios among mothers born in India compared with mothers born in Canada and to compare trends across Canad...
متن کاملClover root exudate produces male-biased sex ratios and accelerates male metamorphic timing in wood frogs.
In amphibians, abnormal metamorph sex ratios and sexual development have almost exclusively been considered in response to synthetic compounds like pesticides or pharmaceuticals. However, endocrine-active plant chemicals (i.e. phytoestrogens) are commonly found in agricultural and urban waterways hosting frog populations with deviant sexual development. Yet the effects of these compounds on amp...
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ژورنال
عنوان ژورنال: Proceedings of the Royal Society B: Biological Sciences
سال: 2020
ISSN: 0962-8452,1471-2954
DOI: 10.1098/rspb.2019.2909