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Unformatted text preview: nfanticide would be adaptive if the current infant and next infant required equal amounts of time until weaning. However, as the current infant usually cannot be killed by a male until after its birth, at minimum, it will be closer to weaning by at least the length of the species’ gestation time. This reduces (by an amount equal to Gestation/ IBIfull) the conditions under which infanticide is adaptive. Males should not commit infanticide unless they can gain a sufﬁciently larger share of paternity in the next (second) infant over the current (ﬁrst) one to compensate for the time invested in the current offspring. The possibility of indirect ﬁtness beneﬁts through male–male relatedness would also serve to reduce the conditions under which infanticide is adaptive, such that males would only be infanticidal in the lower-right shaded area, the ‘danger zone’, described by inequality (3a). Increasing gestation:lactation ratios and male–male (MM) relatedness would decrease the incentive for infanticide and result in a larger ‘paternity disagreement zone’ in which...
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This note was uploaded on 04/05/2011 for the course ANT 154bn taught by Professor Debello during the Winter '10 term at UC Davis.
- Winter '10