BIOL 3170 Lecture Notes - Lecture 7: North Atlantic Oscillation, Soay Sheep, Group Selection
Document Summary
Populations often rise and fall predictably in cycles. It is not always food availability: predator/parasite regulation (kind of related to food availability, group selection (predicted proven wrong, climate. Food availability and predator-prey relationship: example: hare and lynx population cycles. It is predicted that the hare population is somewhat limited by the lynx population, but mainly by plant availability: thus the cycles are the result of a three-way, carnivore-herbivore-plant interaction. K), natural selection selects for individuals with low reproductive success so population growth slows down and popln declines? e. g. individuals which produce less offspring are selected for because it will benefit the group. North atlantic oscillation (nao: pressure changes which affect climate in western europe (including scotland, high nao index mild wet winters, slow but continuous grass growth, winter mortality is moderate pop"(cid:374) stays (cid:374)ea(cid:396) k. Low index cold winter food supply collapses: crashes.
