The sexual system of the symbiotic shrimp Thor amboinensis is described, along with observations on sex ratio and host-use pattern of different populations. We used a comprehensive approach to elucidate the previously unknown sexual system of this shrimp. Dissections, scanning electron microscopy, size...
QUASI-REPLICATION AND THE CONTRACT OF ERROR: Lessons from Sex Ratios, Heritabilities and Fluctuating Asymmetry Selective reporting—e.g., the preferential publication of results that are statistically significant, or consistent with theory or expectation—presents a... AR Palmer - 《Annual Review of ...
In Japan, the ratio of never-married men to married men has risen rapidly since the second half of the 1980s. In this paper, we focus on the disruption of the gender balance, and on the effect that this and education level have on marriage behaviour. We confirmed that the rise in the...
In many insect societies, workers can manipulate the reproductive output of their colony by killing kin of lesser value to them. For instance, workers of the mound–building Formica exsecta eliminate male brood in colonies headed by a single–mated queen. By combining an inclusive fitness model ...
The purpose of this study was to determine if male radiologists predominantly father daughters and, if so, to investigate the association between this skewed sex ratio of offspring and radiation exposure. Questionnaires completed by 586 male radiologists in Japan provided data regarding the radiologist'...
It could be proved that the differences in sex ratio as found did not result from a differential mortality of the sexes, but were the outcome of a genuine sex regulation mechanism, operated by the female parent. Rate of oviposition, host density, and degree of superparasitism did not affect...
We conclude that the mono-sex breeding technique by YY super-male yellow catfish is stable and reliable, which has great potential for application in yellow catfish aquaculture. 展开 关键词: Yellow catfish All-male YY super-male YY physiological female Fertile ...
The accuracy of a population-based sex ratio at birth (SRB) in China has long been questioned. To depict a more accurate profile, the present study used data from a national surveillance system for health facility births to explore the characteristics of SRB in China. Data from China's Natio...
Both the sex ratio and the extent of sexual size dimorphism (SSD) can have important implications for the mating system of a species. In particular, the sex that is limited (generally the female) is often the subject of intense competition, which can drive changes in behaviour and morphology...
China's Unbalanced Sex Ratio at Birth: How Many Surplus Boys Have Been Born in China Since the 1980s? 来自 Springer 喜欢 0 阅读量: 278 作者:DL Poston,L Zhang 摘要: In recent decades China has experienced an extremely rapid fertility reduction from more than six children per woman in the...