UNI101Y1 Study Guide - Metapopulation, Calliphoridae, Sub Pop
16 Feb 2013
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Chapter 12: temporal and spatial dynamics of populations: pop. fluctuate in response to: Pop. of species w/ larger bodies and longer life spans respond less rapidly to changes in their envmts. The age structure of a pop. often indicates variations in recruitment over time. Ex. seedlings of a certain tree species tend to become established in forests primarily following a major disturbance: discrete-time models of density-dependant populations: Show pop. sizes tend to oscillate when disturbed. Behaviour depends on the proportional rate of increase (r) per unit of time. 0 < r < 1 : pop. size approach equilibrium (k) w/o oscillation. 1 < r < 2 : pop. size undergoes damped oscillations and eventually settles down to k. R > 2 : pop. size oscillates in increasing amplitude (limit cycles) until a stable limit cycle is achieved or; the pop fluctuates irregularly (chaos: continuous-time models of density-dependant pop. Predict pop. cycles when there are time delays.
