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In many salmonid species, males exhibit morphological dimorphism associated with alternative mating behaviors. We quantified selection on precocious male parr of masu salmon Oncorhynchus masou under simulated natural conditions to examine the contribution of morphology to sneaking success. In contrast to the prediction that sneaking behavior favors small body size, we detected selection favoring relatively large body size for sneaking success. This selection pressure was caused by the dominance hierarchy within parr and may have been facilitated by indifference of dominant migratory males to parr. Unlike the secondary sexual characters exhibited by migratory male salmon, such as the hooked snout and humped back, no morphological characters other than body size contributed to the reproductive success of masu salmon parr. This non-contribution may have been responsible for the lack of development of sexual characters in precocious males.

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NCBI Bookshelf. Mickey Emmanuel ; Brooke R. Authors Mickey Emmanuel 1 ; Brooke R. Bokor 2. Puberty is a time of rapid and complex changes involving overlapping components: hormonal, physical, and cognitive.
The onset of sexual maturity puberty is triggered by hormonal changes that lead to physical and behavioral changes. Generally speaking, puppies will start to mature sexually between 7 and 10 months of age. There is some variation and every dog is different. Normally, females have twice-yearly cycles, but there are some females who will come into heat only once a year. Most have their first heat at about 10 months.