Lecture 12 - BIO220

Fathered archie et al 2007 figures 1 and 2 13 even

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Unformatted text preview: paternal kin! fathered Archie et al. 2007; Figures 1 and 2 13 Even time spent c ourting & mating K IN and NON KIN MORE time spent c ourting & mating w ith KIN Inbreeding avoidance! Avoid c ourting and m ating KIN! 14 -There must be a way for the male to sense how closely related t hey are to any given female -Not only are males just avoiding direct siblings, but half siblings t hrough their FATHER as well! -(A male's father will go on to mate with OTHER females and m ake OTHER baby females. The male ALSO shows choice AGAINST these half sisters that he's NEVER even had contact w ith) Observation: Some wolf populations in Canada migrate, others don t Summary: Elephant Mating Behavior • Male reproductive success is highly skewed, and should create strong costs of inbreeding avoidance • Why might this be the case? • Are these wolves different ecotypes? • Although males outweigh females (by 2x), females may exhibit some choice and avoid mating with close relatives. This is hard to assess. – Do they show genetic differentiation at neutral markers? • What ecological forces could lead to migration differences? • Despite these costs, males avoid inbreeding. • Males compete strongly for mating; fights sometimes even lead to death. – Suggests fitness benefits of inbred offspring do not outweigh costs of fighting for mating opportunities. 15 -Inbreeding cost is just too high to make it worth it to mate with a relative. It is better to not mate at all -Females may exhibit choice as well, but it is hard to assess -Genetic analysis allows us to study populations like this one that a re impossible to study in the lab -GENETICS EXPLAIN BEHAVIOUR 16 -Here, BEHAVIOUR explains GENETICS -Are the differences in migration behaviour mediat...
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