Sex ratio, size, age, and spatial pattern were investigated for males and females of the dioecious shrub Ceratiola ericoides ericoides (Empetraceae) Michx. within seven mapped populations in Georgia and South Carolina, USA. Among the sites studied, two are regularly burned and one site long-...
Have USA total neurological deaths (TNDs) of adults (55-74) and the over 75's risen more than in twenty Western Countries?World Health Organization TND dat... P Colin,RL Emily - 《Surgical Neurology International》 被引量: 0发表: 2020年 Sex ratio is variable and increasingly male biased...
Using a microsatellite assay, we investigated sex ratios at three levels (apparent, intrinsic, genet) for Populus euphratica stands in Xinjiang, China and possible consequences of sex-specific costs of reproduction in terms of clonal growth and individual growth or mortality. Sex ratios at all level...
Moreover, FMI and body fat distribution indices consistently increased with age in both sexes, especially in women. In comparison with white, black, and Mexican populations in the USA, Chinese adults had lower total FM, but had greater central adiposity (% fat trunk/% fat legs ratio and ...
In theory, birds should control the sex ratio of the offspring they produce. In practice, we have very limited evidence to support this idea because of our... R Griffiths,S Daan,C Dijkstra - 《Proceedings of the Royal Society B Biological Sciences》 被引量: 953发表: 1996年 Adult sex ra...
In small cetaceans, the gender of individuals usually cannot be determined at sea, and population sex ratio has to be inferred indirectly. We used molecular sexing to determine the gender of 340 biopsy samples of bottlenose dolphins, Tursiops truncatus , spotted dolphins, Stenella frontalis , and...
The number, sex, and size of the crayfish captured by each trap in 2days were recorded and compared among types. The results confirm that males are attracted by the females' sex pheromones: the sex ratio of the crayfish captured by the traps containing females was significantly biased towards...
The progeny of two of five such pairings had a combined male to female ratio of 2.2, indicating that in rainbow trout the male is heterogametic for sex. The results were insufficient to permit any reliable estimate of the degree of impairment of the viability of the YY constitution. A ...
Natural Selection of Parental Ability to Vary the Sex Ratio of Offspring Theory and data suggest that a male in good condition at the end of the period of parental investment is expected to outreproduce a sister in similar condi... RL Trivers,DE Willard - 《Science》 被引量: 7092发表: 19...
In dioecious plants, intersex differences in the frequency and size dependence of flowering may often be important proximate determinants of a population's flowering sex ratio. Such differences have been little investigated among Southeast Asian rain forest trees, where dioecy is perhaps best represented...