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age) 10 1. Inbreeding depression: Fitness will decrease from mating with
relatives. Inbreeding avoidance would evolve to escape these
negative effects from inbreeding depression.
2. May be worth it to mate with a relative because it is better
t han not mating at all. Competition bet ween males is high, so if
t hey even get an opportunity to mate at ALL (even if it is a
relative), it is better than not mating.
-Either this or, inbreeding depression is just weak (breeding with
relatives does not decrease fitness) The litmus test: Do males behave in a way that
suggests inbreeding avoidance? Experiments with Elephants are Impossible!
• Gestation is 22 months! • Observe elephant behavior • Lifespan is 62 years! • Quantify mating behaviors
and assess whether they are
directed away from kin • Measuring inbreeding
depression or fitness
directly is infeasible. Google images : And you
thought your job sucked • Maternity is a certainty,
paternity requires genetics Therefore, use genetic markers to apply an
11 -Elephants live way too long to be able to perform these
e xperiments in a lab Paternity Analysis in the Lab
with genetic markers 12 -It is easy to see a mom giving birth to an elephant and
determine that they are the mother of that child
-However, it is almost impossible to keep track of male mating
-Poo: used for paternity analysis to determine genetic markers 3 25/02/2013 Possible Results
preference Observed Behavior Towards
Non Natal Family or Distant Kin Inbreeding
Towards Kin Observations
Toward NON Kin No difference
in behavior Results: Elephants Avoid their Kin Courtship Offspring
fathered Courtship Offspring Observed Behavior Towards
Natal Family or Close Kin
Courtship fathered Offspring These results even hold
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This document was uploaded on 01/27/2014.
- Winter '14
- Annotated Lecture S