BIOL 210 Lecture 19: 19alternativemalestrategies.pdf
21 Nov 2014
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Alternative male strategies: males in many species adopt alternative reproductive strategies (aka polymorphism, bluegill sunfish parental males build nests and attract females to spawn. Sneakers (mimic females!) and satellites have other approaches Change from black to orange: time taken to reach sexual maturity: costs of parenting, delayed maturation, higher probability of mortality, energy required to defend and fan nest. Why not sneak: no parenting costs, nest defense, fanning, earlier maturation, population growth is exponentially related to generation time, sneakers have great grandchildren before parentals have any. Varied returns in georgian spotted sunfish, 5-15% of males estimated as sneakers, but parasitic" males acquired only 1. 5% of fertilizations. in bluegill, cuckolder male morphs typically acquire about 25% of paternity-share in pumpkinseed, 38% of fry were from cuckolders. Defending against cuckoldry: can parental males detect cuckold offspring, neff"s group thinks yes, fish have good sense of smell, odour of urine may be used to id kin, (aids in inbreeding avoidance as well)
