BIOL 2060 Lecture Notes - Lecture 15: Log-Normal Distribution, Isocline, Red Queen Hypothesis
12 Apr 2016
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Document Summary
Type i consumpion by predators increases monotonically as prey density increases. Type ii consumpion by predators" plateaus out at high prey densiies because of handling ime (most common) Type iii consumpion is accelerated at low prey density, but decreases at high prey density as the asymptote is reached (e. g. switching to common prey) Characterisic of passive predators (e. g. spiders, ilter feeders) May result when prey do not become suiciently abundant to saiate the predators (e. g. kestrels and voles) All of the ime allocated to feeding is spent searching. # prey eaten asymptote because as # of prey captured increases, the handling ime also increases, decreasing the ime available for further searching. Prey mortality rate declines with increasing prey density. Iniial rate or prey mortality increases with prey density. May occur when prey have (limited number of) refuges. Coevoluion: when a species evolves in response to another species.
