BIO-8 Lecture Notes - Lecture 13: Rinderpest, Population Projection, Fecundity
Document Summary
Most lab and natural examples are s-shaped. The meaning of r, the intrinsic rate of natural increase. Difference in birth and death rate expressed per capita. Hence r is expressed as a per time value. R, reflects inherent ability of a population to grow. Logistic models (to be covered under competition ) Deterministic models predict an exact numerical outcome. Stochastic models permit chance variation in r. Each individual leaves 4 offspring before it dies. Population is certain to go extinct given eough time. All females must fail to reproduce before they die, then they go extinct. If population large, expected time to extinction is small. Expected time to extinction decreases as n decreases. Expected time to extinction increases as n increases. N=population size (matters a lot in probability of extinciton). Note how important population size is for understanding probabilities of extinction let d0=. 2; b0= . 4 n=5 ind.
