BIO 181 Lecture Notes - Lecture 6: Carrying Capacity, Infant Mortality, Bar Chart
Document Summary
Norm. a species isn"t uniformly distributed over its range. i. Not as good -> still livable ; lower pop. density. Elephants reach sexual maturity in 15 years - slow. Emigration - individuals that leave to join/ form other pops. Growth = rate of reproduction ( r ) * number of individuals(n) If r= 2. 1 then n = 2, g= 2. 1*2=4. 2. G= rn(k-n)/k (k-n)/k has a slowing effect on growth: If n=2 / k=100 then (k-n)/k =(100-2)/100 =. 40. Growth rate = 0 pop is of stable size. Balance where rn increases growth rate and (k-n)/k decreases growth ra. Reduced ability of environment to support a large pop. Can be set by a single environmental factor. Grass grows well in a lawn but a few feet away wont grow u shading. Excess individuals despoil the environment, reducing k and p. Environmental stress causes a pop crash to extinction or nea. Today: change of n = 201,000 per day [b-d}
