Biology 1001A Lecture Notes - Lecture 22: Evolutionary Arms Race, Garter Snake, Arms Race
16 Aug 2017
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Mutualistic, competitive and antagonistic relationships between species, given "real world" examples. Acacia plant provide food and shelter and acacia ants protect plants against other herbivores. Flowering plants and pollinators (birds, bats, insects). Plant gets its pollen moved around and the pollinator is getting a nectar reward. Humans are good at forming mutualism with other species. (domestication). Increase population size in both parties. (e. g. farming animals or trees) Competition: when two species interact, both incur costs. Competition arises when there is a limiting resource that both species need to survive (food) Lions and cheetah eat the same kind of food. Any prey that gets consumed by lion will not be available for cheetahs. Both species suffer a reduction of population size and fitness. They"re incurring costs that wouldn"t have happened if other species wasn"t there. Plants in a forest compete for sunlight. Antagonistic: when two species interact, one benefits, the other incurs costs.
