ZOO 4070 Lecture Notes - Lecture 9: Siblicide, Evolutionarily Stable Strategy, Psychological Manipulation
23 Mar 2016
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Types: establishing & maintaining nest or territories, producion & provisioning of gametes, care of ferilized eggs, provisioning ater hatching or birth, care ater nutriional independence. Lack (1968: when 2 parents can raise more ofspring than one, selecion should favour bi-parental care. Females iniial commitment is higher than the males (eggs > sperm) Female iniial investment commits her to addiional investment. Bateman gradient: selecion should act against male investment because males can increase reproducive success by maing with addiional females. Trivers (1974: parental investment over a single season. Individual with lower parental investment loses less if no ofspring are raised. Any success of the partner will beneit the deserter: temptaion to desert is the value of leaving and how well your partner will do without you. Tested value of parent care by removing each parent. Hypotheses that explain value of bi-parental care in habitat a: more frequent feeding trips, beter defence against predators.
