BIOL 3062 Lecture Notes - Lecture 15: Polygyny Threshold Model, Animal Sexual Behaviour, Prothonotary Warbler
1 May 2017
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Prothonotary warbler: have a large territory available nest holes are sparsely distributed. House sparrows: males try and mate polygynously, but one female mate will fight off any other prospective females, most aggressive during copulation. Less aggressive during egg laying, then aggression comes back slightly during incubation: worried about losing paternal care to another female. Social vs. genetic mating system: extrapair fertilizations (epfs, ex. Spe(cid:272)ies appears (cid:373)o(cid:374)oga(cid:373)ous, (cid:271)ut is(cid:374)"t a(cid:272)tuall(cid:455) varies across environments and species. Benefits for females in extrapair copulations: direct (non-genetic) Fertility insurance: making sure all eggs are fertilized. Indirect (genetic benefits) improves success of offspring down the road: good genes. Female defence polygyny: males guarding females, females not moving around, difficult to guard them. Fairly rare: resource defence polygyny, main source of polygyny. Second females get fewer young less benefits than the first female mate. Red-necked phalarope: mainly male parental care of eggs.
