LIFESCI 2D03 Lecture Notes - Lecture 25: Typha, Dna Profiling, Lek Mating
12 Jan 2018
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Document Summary
Monogamy does occur in some species without biparental care. Territorial cooperation hypothesis two individuals (one of each sex) can better defend a critical resource (safe refuge) than can a single individual selection favors pair formation. Polygyny and polyandry evolve when one sex can defend multiple mates or the resources they seek. M defend + mate with multiple f directly, by defending f, or indirectly, by defending resources. Female defense polygyny in feral horses: live in social units (bands) 1m and up to a dozen f. If > 1 m a single male obtains most, or all the matings: recorded location of bands each month. Males compete with one another to establish a dominance hierarchy, often on a lek, and females mate with high-ranking males. Hotspot hypothesis: males benefit by aggregating in a location where they are likely to encounter many females. Hotshot hypothesis: males increase their encounter rate with females by aggregating near an attractive male: not mutually exclusive.
