BIOLOGY 3SS3 Lecture 1: 1 and 2
12 Apr 2017
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Individuals behave independently: growth/decline proportional to population size, grows/declines exponentially, exponential growth/decline cannot continue forever (even on average, environmental variation cannot be the only thing that changes growth rates, directly/indirectly limiting their own growth, density dependence. Population maintains lt rate = 0 (or very close) Factors affecting growth rate change with population size. All populations are regulated: possibly with time delay. Regulation is not always apparent (limitations only occur at certain times, controlled by hard to see natural enemies) Regulation works over the long term: long term average of r = 0 for all populations, this is not by chance directly/indirect to population size. Recruitment organism moves from one life stage to another. Birth rates generally goes down with increasing populations: can increase when they switch resources to reproduction instead of survival. Death rates increases with increasing populations: can decreases resting modes. Carrying capacity (k) r (n) = 1 b(k) = d(k)
