It is generally believed that the presence of cytoplasmic sex ratio distorters in a population causes selective pressure on autosomal genes for a compensatory shift in the sex ratio. Investigations reveal that when within lineage transmi... JH Werren - 《Journal of Theoretical Biology》 被引量: ...
The mean sex ratios of twin births during the period from 1960 to 1967 and in 1974 were 0.4995 and 0.5605 for live births and fetal deaths, respectively; the difference is significant. The sex ratio of Japanese twin births is not so high compared with those of Europe and the USA in the...
The secondary sex ratio (SSR) has been suggested to decrease with adverse physical and psychological environments. Previous studies have focused on reduced SSR under adverse conditions, such as war, terrorism attack and earthquake, but few studies have investigated fluctuations in SSR in moderately adv...
Objectives: We describe trends in sex ratio at birth and in fetal deaths in the United States, in African Americans and in whites, and in Japan, two industrial countries with well-characterized health data infrastructures, and we speculate about possible explanations. Methods: Public health records...
There was no significant shift of sex ratio in the total of the eight districts for any breed, or in the sum total of the three breeds for any district (Table 1).2. A regional difference in sex ratio was observed most frequently between the H and any other district. It was difficult,...
Brooding season, sex ratio, and brood pouch development in the seaweed pipefish, Syngnathus schlegeli , in Otsuchi Bay, Japan 喜欢 0 阅读量: 189 作者: WY Watanabe 摘要: Males of the seaweed pipefish, Syngnathus schlegeli, take care of their eggs in the brood pouch. These pipefish were ...
摘要: Embryo and hatchling sex ratios were unbiased in samples of habu, Trimeresurus flavoviridis, from Okinawa, Japan. Sex ratios dit not vary with maternal size or age. Large eggs produced large hatchlings with high proportions of residual yolk. Slender eggs produced lighter hatchlings....
The sex ratio for all specimens had a tendency towards male bias (0.587), but this bias was higher for the adult (0.605) than for the young (0.576). Among young (0 year-old) foxes, more individuals were killed on roads than by trapping or shooting (PP 展开 关键词: Vulpes vulpes age...
The growth, sex ratio with age, and age at sexual maturation were determined based on sectioned otoliths in 257 specimens of the blackspot tuskfish Choerodon schoenleinii collected in waters off Ryukyu Island. Opaque rings observed by reflected light in the sectioned otoliths were found to form...
Population by Age (Five-Year Groups) and Sex, and Sex Ratio-Japan : 1920 to 2000 喜欢 0 阅读量: 50 作者: NS Bureau 被引量: 3 年份: 2006 收藏 引用 批量引用 报错 分享 求助全文 通过文献互助平台发起求助,成功后即可免费获取论文全文。 请先登入相似文献 引证文献Country of birth and risk ...