BIOL 230 Chapter Notes - Chapter #5: Population Cycle, Exponential Growth, Logistic Function
Document Summary
Ch 12 pg 281-282 (cid:894)(cid:374)ot predicti(cid:374)g the outco(cid:373)e (cid:895). 4 major types: exponential growth, logistic growth, population fluctuation, regular population cycles (a special type of fluctuation): a single pop can experience these 4 diff types at diff times, the(cid:455)"re also (cid:374)ot (cid:373)utuall(cid:455) e(cid:454)clusive. Exponential growth: pop increases/decreases by constant proportion at each point in time. Can occur when conditions are favorable: can be represented by for organisms that reproduce in synchrony at discrete time periods, or by reproduce (cid:862)co(cid:374)ti(cid:374)uousl(cid:455)(cid:863). for organisms that. Pops can increase exponentially for a limited time. Such periods of exponential growth can occur within established range of a species, as when good weather occurs for several years running. Can also occur when species reaches a new geographic area (if conditions are favorable, populations can increase rapidly until density dependent factors act to regulate its numbers. Some pops reach relatively stable pop size (equilibrium) that changes little over time.
