BIOL101 Lecture Notes - Mating Plug, Damselfly, Ceratitis Capitata
18 Jan 2013
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Document Summary
Intrasexual selection- differential mating success among individuals of one sex due to interactions with members of the same sex (ex. Fighting with each other over the opposite sex); for example, differences in mating success among males due to male-male competition over access to females. Sexual selection by male-male competition often occurs when individual males can monopolize access to females. Males may monopolize females through direct control of the females themselves or through control of some resource important to females, such as feeding territory or nest sites. Male-male competition can also occur for no apparent reason beyond simply impressing females. There are three forms of male-male competition: outright combat, sperm competition, and infanticide. Outright combat is the most obvious form of male-male competition for mates. Intrasexual selection involving male-male combat over access to mates can favour morphological traits including large body size, weaponry, and armour. Male-male combat also selects for tactical cleverness.
