Equations
number of organisms per unit of area can be calculated by
population/area they occupied
why does Kenya have less of a population of post reproductive individuals
economy poor so less health means less people
since the human population is counting to slow then
the human growth rate is slowing down
density independent factors
weather fire human alterations to landscape air land and water pollution
what is the major growth period in a short amount of time
what is exponential growth
calculate 1200 dusk breaded fowls in 600 square miles
2 dusk breaded fowls per square miles
examples of why the human birth rate could be going down
money
not wanting baby ect
when country seem to have the same economic they also have the same
growth rate
Hungary, disease, competition, predation
density dependent factors
density dependent factor
calculation for PGR
(birth rate - death rate + migration rate)/10
what are reasons exponential growth may occur
more money/food etc
modern age
when a populations growth slows or stops following exponential growth.
logistic growth
explains how fast a given population grows
Population growth rate
calculate ZPG
when birth + immigration = death + emigration
in the isle royal case study why did the wolves suddenly rise when they got introduce to new food
new and bigger food support meant they could have more babies
a populations age structure consist of what 3 groups
pre-reproductive stage
reproductive stage
post reproductive stages
the pattern of spacing of a population within an area called
dispersion
the change between his death rates and birth rates to low death rates and brith rates
demographic transition
if 1000 people died in a fire but 100 were born and 200 immigrated here from china but 4 citizen emigrated to kazakshtan how many people would there be if the population was orginally 5,000,000
4999296 warm blooded Americans
what graph shows
farming begins plowing, irrigation begins, bubonic plague and Industrial Revolution begins
the four stages of demographic transition
in what ways have humans learn to alter there landscapes
agriculture domestication of animals medicine improvement to shelter
a population stops increasing when
births<number of death, or when emigration>immigration
the transition on a graph from lag phase to carrying capacity
s curve