chapter 19 population ecology Flashcards
how do you measure population density
count the area and divide by the number of individuals
Population growth
rate of change in population size
types of population growth models
exponential and logistic
Logistic
Population grows fast at first then slow as reaching upper limit
what are some assumptions on exponential growth ?
there is continuous reproduction, all organism are reproducing and the environment is constant
Population limiting factors
factos the restrict population growth
carry capacity
the maximum number of individuals an environment can sustain
density dependent factors
they depend on the population density ( food, space and waste)
density independent factors
they dont depend on population density ( weather , natural disasters)
Population cycle
where the populations rise and fall over a predictable period of time
survivorship curve
plot of number of individuals alive at each age
how many types of survivorship curve are their
type 1,2,3
type 1
low death rates at the early and middle life with more death at the end
Equilibrial life history
the pattern of reaching sexual maturity slowly and producing offspring but caring for the young
type 2
Mortality is constant over the life span of the individuals
