bb2011 ANP220 13 Aggression key to success

bb2011 ANP220 13 Aggression key to success - Goals for...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Is male aggression and competition key to reproductive success? ANP 220 meeting #13 Goals for today articles by Zimmer and Brownlee stories of SB Hrdy & KB Strier infanticide and sperm competition male-male competition direct & indirect, consequences if females are group- living, how forms & strength of competition vary “logic” of infanticide current evidence, sexual selection hypothesis what about other cases: infanticide in monogamous species, Thomas’ langurs, and humans First, kill the babies Carl Zimmer Summary: Zimmer story of Sarah B. Hrdy Hanuman langurs aimed at studying overpopulation found that males kill infants did not actually observe it suggested evol. explanation nursing mother can’t conceive if infant is killed, mother starts ovulating again killer benefits (if he doesn’t kill his own offspring) Hrdy & idea vigorously attacked animals don’t kill their own kind killing pathological a lot of support from recent studies still major discussion among anthropologists
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Argument and counterargument Hrdy’s idea attacked evolutionary explanation justifies murder counterargument cannot learn moral rules from nature “naturalistic fallacy” Naturalistic fallacy Use of a naturally occurring phenomenon as moral justification example high fitness = biological successful “biologically successful” = “good” ??? NO: “good” / “bad” = judgments confusion of evolutionary explanation (= understanding) with moral justification (= judgment) These are real swinging primates Shannon Brownlee Summary: Brownlee story of Karen B. Strier muriquis (woolly spider monkey) aimed at conservation of largest South American primate found that males have very large testes, no rank order, don’t compete overtly, very tolerant suggested evol. explanation large body size & arboreal high energy demand for locomotion costs of falling too big to fight no size dimorphism female choice males compete via sperm large testes
Background image of page 2
3 Is aggression and competition key to male reproductive success? Answer: It depends . .. Intrasexual selection (male-male) mate competition “winner” gets to mate key to success access to fertile females form & strength of sexual selection depends on distribution of females mating system Male-male competition direct favors abilities that increase chances of monopolization of fertile females favors fighting abilities e.g., weaponry, large size Male-male competition direct favors abilities that increase chances of monopolization
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/07/2011 for the course ANP 220 taught by Professor Koenig during the Spring '10 term at SUNY Stony Brook.

Page1 / 10

bb2011 ANP220 13 Aggression key to success - Goals for...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online