biodiversity Flashcards
how many in a given area
density
how spread out
distribution
the number of females of reproduction age and the number of females reaching reproduction age
age structure
3 types of distribution
clumped- unequal, distribution of resources, poor seed dispersal mechanism. *animal- pack hunting, safety
even, not thought to exist in nature
random
one or more resource is rare, territoralism especially in solitary animals
uniform
growth of population
birth
immigration
death
irrigation
each individual contribution to population growth
per capita growth
the maximum number offspring a female can produce over her lifetime in optimal conditions
biotic potential
the number of organism in a population that the environment has the resources to support. (not constant)
carrying capacity (K)
things that limit population growth
factors
as population size increase, either birthrates decreases or death rate increases.
competition
diseases
predation
density dependent
no correlation between population size and birth/death rates (natural disaster)
density independent
rapid constant growth rate never reach (k) carrying. selection favors maximal growth rate in an uncrowded environment
exponential growth
a period of exponential growth but as the population reaches K growth rate slows dramatically, population size fluctuates at K
logistic growth