ecology notes
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19 Terms
population change =?
(births + immigration) - (deaths+emigration)
births
individuals born
deaths
individuals that die
immigration
individuals entering
emigration
individuals leaving
type 1
low death rate when young, higher when old
type 2
same chance of dying at any age
type 3
high death rate when young, few survive adulthood
sex ratio
ratio of males to females
monogamous species
one male + one female
not monogamous
one male can mate with any females
levels of ecological organization
individual
population
community
ecosystem
biosphere
wide base
rapid future growth
even shape
stable population
narrow base
declining population
predators
increase juvenile deaths
isolation
no immigration
selective pressure
affective mating pressure
carrying capacity
the most population a environment can hold