PHSI3010 Lecture Notes - Lecture 5: Secondary Sex Characteristic, Body Shape, Estrone

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Lecture 5: sneaky sex the evolution & endocrinology of mating systems. Mating system: social organisation used by a species to maximise reproductive output. Influenced by environmental factors: range from solitary individuals to large complex groups of m/f in mammals in birds. Excreted in the urine and faeces conjugated with sulfuric acid or glucaronic acid: estradiol and estrone are converted in the liver to estriol excreted in the urine and faeces conjugated with sulfuric acid. Advertising sexual maturity/ receptiveness & pregnancy: using conjugated steroids in urine & faeces. Latrines known sites where all individuals in an area will pass at different times. In several harem breeding species, any new male that takes over the group will kill all dependent juveniles. Infidelity in birds: 70% of bird species have extra-pair paternity, e. g. Australian fairy wrens (78% young sired by extra-pair matings, 95% of broods have at least. 1 young from an extra pair mating: e. g. Dunnocks (europe): monogamy, polygyny, cooperative breeding: e. g.

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