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Ch 15 Coevolution

Terms in this set (14)

coevolution
reciprocal evolutionary change between interacting species driven by natural selection; exerts selective pressures
mutualism
+/+
bird eats seeds, poops out seeds, disperses
commensalism
remora fish attach onto shark and each excess shark food
antagonistic
parasitism, herbivory, predators
reciprocal selection
selection that occurs in 2 species due to their interactions with one another.
results in geographic variation.
requires variation in both partners.
geographic mosaic theory
geographic structure of populations = effects of coevolution
negative frequency dependent selection
performance of alleles drop as they become more common.
as parasites increase, fitness of common host goes down.
lots of parasites on common host genotype - common host genotype becomes rare and other hosts get advantage due to higher fitness - parasite is selected for difference - new rare host genotype becomes common and the new parasites have higher fitness
accelerating
newt and snake
decelerating
myxoma and rabbit
mullerian mimicry
bad = bad
batesian mimicry
good hides itself in bad
mutualists
positive alleles increase mutualistic interaction and increases that allele

positive frequency dependent selection reinforces relationships
cospeciation
head lice evolves with humans
phylogenies match
host switch, extinction, duplication
coevolutionary arms race
prey develops defense against predation - predator responds with evolution to counteract defense

fitness costs are higher for prey
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