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Biology 3466B Study Guide - Philopatry

Course Code
BIOL 3466B
Yolanda Morbey

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November 18th, 2011
- typically you will see altruism is social organisms
- homologous allele’s refers to alleles being identical by descent
Calculating r with pedigrees
- you need to distinguish r from f
Hamilton’s Rule
- the indirect fitness is “br”, the increase in lifetime reproduction success
- it relates to the reproductive success of a relative due to helping
Alarm calling in black-tailed prairie dogs
- philopatric stay close to where they’re born, sometimes they may leave for
a bit but they will always breed where they were born
- this means you have a lot more unrelated males than unrelated females
- in both males and females, they were much more likely to give an alarm call
when they were with close kin, helping behavior is directed toward kin more
often than non-kin
POC over duration of parental care
- the x-axis represents the nestling period
- the y-axis is showing the benefit to cost ratio to the parent for provisioning
the young
- the benefit is in terms of the increased survival of the offspring
- the cost is measured in terms of the decreased production of future offspring
of that parent
- as the offspring can survive on it’s own the benefit/cost should decrease
- the parent should stop provisioning when the benefit/cost ratio is less than 1
- however offspring should continue to demand care from the parent as long
as the benefit/cost ratio exceeds 0.5
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