HIST 1001 : Bio Final
Document Summary
Population: a group that includes all the members of a species living in a given area. 4 factors: birth (positive, death (negative, immigration (positive, emigration (negative) Natural selection: acquire favorable trait that will help them survive in their environment that will get passed down to their offspring. Environmental resistance: resistance set by the living and nonliving on the population. Availability of nutrients, space (overcrowding and pollution can lead to disease) Parasite: spread more rapidly among dense populations; feed on larger organisms. Competition: the interaction among individuals who attempt to use the same limited resource, limits population size in a density-dependent manner; help control population. Interspecific competition: competition among individuals of different species. Intra-specific competition: competition among individuals of the same species. Predation: exert density-dependent controls on populations; organisms that eat other organisms; known as prey. Growth rate (r): change of a population per individual per unit of time (r) growth rate = (b) birth rate (d) death rate.
