EEB 3408W Lecture 10: ecology lecture 10

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University of Minnesota Twin Cities
Ecology, Evolution, and Behav
EEB 3408W
Cavender- Bares, Jeannine

Lecture 10 - Predator/ Prey Interaction - +/- interactions- play a huge role in the distribution and abundance of organisms - Examples: - Moose and wolves on Isle Royale - Simple system without complex interactions of multiple prey and predators - Populations have not reached EQ densities - Fluctuate unpredictably - Moose feed on balsam fir - if over foraged or unable to be found, the moose suffer - 80/90% moose death is because of wolves - Moose are attacked by disease as well - Climate change impacts the system with earlier springs - Clear oscillations show that wolves impact densities of moose and moose impacts densities of wolves - Lynx and Hare - Strong oscillatory data - Lynx buildup follows and lags the hare buildup producing sequential crashes - Peaks of predator and prey sometimes coincide - Klamath Weed - Aggressive perennial that displaces desirable grasses and herbs - Leaf eating beetles can be used to help - Predation can be transient and difficult to identify - Humans perturbate natural systems which become less stable - Present patterns of distribution and abundance can be misleading - Predator imposes large negative effect on prey population dynamics with a lag - The boom and bust cycles are analogous to oscillations of discrete or lagged density dependent logistic growth Lotka Volterra Predator Prey Model - Assumptions: - Ideal environment for prey (DI) - Ideal environment for predator except that growth rate is limited by prey - Continuous reproduction, ageless, parthenogenetic populations of identical individuals of both predators and prey - Predation rate is proportional to encounter rate which is a random
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