Biology 4218A Lecture Notes - Lecture 3: Homo Sapiens, Bay Checkerspot Butterfly, Metapopulation
Document Summary
How do spatially variable environmental influence population dynamics. Will not find individuals of a species everywhere within the area indicated on the map. -no species not even the most abundant, is found everywhere within its mapped range. Populations are divided into separated, discrete subpopulations that live in distinct habitat patches-areas of a particular kind of environmental that are surrounded by other kinds. Metapopulation: larger population to which such subpopulations belong. Rescue effect: immigrants may prevent declining subpopulations from becoming extinct. Populations of migratory species may be influenced by events on both teh breeding and wintering grounds, as well as in the places where teh individuals stop to rest and feed during migration. Both the total number of births and the growth rates of individuals tend to be highest when a pop"n is well below its carrying capacity in fast-reproducing pop"n, growth rates of individuals are often density-dependent.
