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ANT 154B Course notes- Lecture _9

Infanticide is predicted to occur under a wider range

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Unformatted text preview: infanticidal species”, most infants survive takeovers: Proof that counter strategies work? Males are not trying to kill infants? Infanticide: concluding points 1. Infanticide has become a stock explanation when all else fails. 2. More data are needed. 3. Need to separate infanticide risk from infanticide rate. 4. Infanticide is predicted to occur under a wider range of conditions than is generally assumed. ANT 154B Lecture #9 course notes page 7 of 7 Take home messages 1. Infanticide is widespread in mammals, and is generally (but not universally) assumed to be adaptive. 2. The primary adaptive hypothesis is the sexual selection hypothesis; alternative adaptive and nonadaptive explanations have been hypothesized. 3. Female and male counterstrategies in the face of infanticide risk may not be as distinct as is generally assumed. 4. Much infanticide in human primates, while still potentially explicable from an adaptive perspective, may occur for different reasons than those assumed to explain infanticide in non-human primates. 5. Infanticide is predicted to occur under a wider range of conditions than has generally been assumed. Question to ponder Infanticide is quite rare in seasonal breeders (i.e., species that predictably reproduce at the same time each year). Using the logic of the sexual selection hypothesis, suggest an explanation for this pattern. Would you expect infanticide in seasonal breeders to be more or less likely if each female did not reliably produce an infant every single year, depending on her physical condition (compared to species in which every female reliably produced an infant every year). Why?...
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