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Age at sexual maturity among male polar bears ( Ursus maritimus ) and timing of the mating season were studied by microscopic and macroscopic analysis of the reproductive organs from 165 male and 92 female Greenland polar bears. Males became sexually mature in the spring following their fifth bir...
The oldest female of the troop has remained sexually active. The attainment of sexual maturity by adulthood can be viewed as a learned process leading to efficiency and prowess, followed in old age by sexual involution. 展开 关键词:sexual behavior age Macaca fuscata primates monkeys ...
The sexual maturity of 320 of the children was estimated using Tanner's indices. Peak V O 2 increased with chronological age in both sexes and from about the age of 12 years boys exhibited significantly higher ( P <0.05) values than girls. Boys' peak V O 2 in relation to body mass ...
Sex-specific plasticity and genotypexsex interactions for age and size of maturity in the sheepshead swordtail, Xiphophorus birchmanni 喜欢 0 阅读量: 68 作者:Grimmer,J A.,Rosenthal,G G.,Walling,A C.,Wilson,Boulton,K.摘要: Responses to sexually antagonistic selection are t 关键词: genetic ...
The size at which 50% of the population spawns for the first time wasc. 147 mm, corresponding to 2.5 years of age. 展开 关键词: bovichtid, growth rate, life span, notothenioids, Southern Ocean DOI: 10.1017/S0954102011000733 被引量: 2 ...
J Markofsky,A Perlmutter 摘要: Aging was studied in the male, annual Cyprinodont fish, from East Africa, Nothobranchius guentheri. Median life-span of the population was 14 months at 21–25°. It was observed that there was variability in the onset of sexual maturity. When the population ...
In organisms with determinate growth, sexual size dimorphism (SSD) occurs before maturity during the developmental process of growing apart, an ontogenetic perspective on the evolution of SSD. If the direction of SSD (female-larger SSD) is known, patterns of growth can be tested with one-tailed...
Treatment of immature mice with gonadotrophins. Effects on some enzymic activities of unfractionated ovarian homogenates The Michaelis constant ceased to increase as sexual maturity was reached. The changes in alkaline phosphatase activity were of a similar magnitude to those ... TA Bramley 被引量: ...
In this study, chronological age was compared to the five stages of sexual maturity, as defined by Tanner (1978) to determine which was better in identifying the abused children. Use of arbitrary age limits makes it difficult to identify what victim features appeal to pedophilic and incestuous...