Anthro Lecture 2-5

Anthro Lecture 2-5 - Anthro Lecture 2/5 I Is sex-biased...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Anthro Lecture 2/5 I. Is sex-biased dispersal an adaptation to avoid inbreeding? a. In most mammals, including most primates, males are the dispersing sex b. Prediction: if sex-biased dispersal functions to prevent inbreeding, then female dispersal will occur when males continue breeding in the same group long enough that they risk mating with their daughters c. Alternative hypothesis i. Males are usually not the dispersing sex because they’re forcibly expelled from their natal group at adolescence ii. Generally not supported d. Is inbreeding avoided when adult-opposite sexed kin are co-resident i. In primate groups, matings between maternal kin (e.g. maternal half- siblings, maternal aunt-nephew pairs) are always rarer than expected by chance ii. E.g in rhesus macaques, most males disperse, but some breed in their natal group. But they almost never copulate with their matrilineal kin iii. Female rhesus macaques stay away from their male matrilineal kin while in estrus II. How do monkeys “know” who their kin are? a. The Westermark hypothesis: close childhood companions develop sexual aversions to each other b. In rhesus macaques, like most primates, maternal kin form close social bonds from early in life c. Some research on monkeys show no inhibition of close kin mating among paternal kin, who don’t necessarily have close bonds in early life d. Phenotype matching: animals could, theoretically, check whether another animal’s phenotype (appearance, odor…) is similar to their own, and then use this as a cue to relatedness e. Some evidence from rhesus macaques and savanna baboons that paternal half- sisters associate preferentially f. Age proximity as a cue?
Image of page 1

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

View Full Document Right Arrow Icon
g. How do capuchins, with long male breeding tenures and female philopatry, avoid father-daughter inbreeding? h. Alpha males sire most offspring of females other than their daughters, but subordinate males sire almost all the offspring of the alpha’s daughters III. Hypothesis a. The relationship between dominance and female reproductive success depends on whether there’s strong contest competition (direct confrontations) for food i. This depends on the distribution of the species’ food sources ii. Food can limit RS: e.g in Japanese macaques, population growth is linked to provisioning b. Savanna baboons feed on corms: clumped valuable food c. Mountain gorillas: wild celery – superabundant, low value d.
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern