Male secondary sex characteristics

The objective of the present research is to study the seasonal morphometric variations of the secondary sexual characters of Aristaeomorpha foliacea and Aristeus antennatus males. Samples were collected from December to November using a commercial bottom trawl in a depth range of — m in the southeastern Ionian Sea Mediterranean Sea. This is the first attempt to resolve the morphometry of the appendix masculina and appendix interna of these species. Carapace length and lengths and widths of appendix masculina and appendix interna were measured in both species. The relationships between the surfaces of the two appendices and the carapace length in both species were studied. There is a positive allometric growth of these structures in both species.
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Secondary sex characteristic

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Do male secondary sexual characters signal ejaculate quality? A meta-analysis

First, if the relationship is positive then females could gain a direct benefit by choosing more attractive males for fertility assurance reasons 'the phenotype-linked fertility' hypothesis. Second, there is much interest in the direction of the correlation between traits favoured by pre-copulatory sexual selection i. If the relationship is negative this could lead to the two forms of selection counteracting each other. Theory predicts that the direction of the relationship could be either positive or negative depending on the underlying genetic variance and covariance in each trait, the extent of variation among males in condition resources available to allocate to reproductive traits , and variation among males in the cost or rate of mating. We conducted a meta-analysis to determine the average relationship between the expression of behavioural and morphological male secondary sexual characters and four assays of ejaculate quality sperm number, viability, swimming speed and size. Regardless of how the data were partitioned the mean relationship was consistently positive, but always statistically non-significant.
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Do male secondary sexual characters signal ejaculate quality? A meta-analysis

Puberty is the stage in life when a child's body develops into an adult's body. The changes take place gradually, usually between the ages of 10 and Changes occur at puberty because of hormones :. The menstrual cycle is a recurring process which takes around 28 days.
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Background: Descriptive data on pubertal stages for a representative population of racially and ethnically diverse boys in the United States have not been published to our knowledge. Objective: To determine at what ages boys in the United States reach each of the 5 sexual maturity stages for genital and pubic hair growth. The sample included white, African American, and Mexican American boys. Main outcome measures: Sexual maturity stages for genital maturation and pubic hair growth.
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