EE BIOL 100 Lecture Notes - Lecture 6: Sensory System, Operational Sex Ratio, Hangingfly

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Sexual dimorphism: any differences in males and females of the same species traits that differ are called (cid:858)di(cid:373)o(cid:396)phi(cid:272)(cid:859, males typically have. Differential investment by the sexes may begin early: When males only provide sperm and there is no parental care (bateman 1948 but see gowaty et al. The effect of additional parental investment: parental investment: anything a parent does for existing offspring that reduces its ability to invest in future offspring. In general, the sex that invests more is a limiting resource for the sex that invests less (trivers: this creates competition for the sex that invests more. Sex role reversal in spotted sandpipers: females more actively court males and defend territories because the males care for young, females may help with the last clutch of the season but will desert if there are other options. In two-spotted gobies, males provide parental care for one or more clutches of eggs.

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