Ecology. Biology 30. Ecology. Study of Ecosystems Abiotic & Biotic factors interacting Biotic Factors include populations & communities. Population Same species Same place Same time. Community Groups of pops interacting. Same species: Same place: Same time!.
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Abiotic factors are the non-living components of an ecosystem
Biotic factors are the living components of an ecosystem
Geographic range can change over time
due to abiotic factors.
How has the geographic range of moose
changed since the 1870’s??
Each group has a different role to
1. Clumped - individuals grouped in patches due to certain environmental factors (e.x. trees clump on south slopes of river valleys b/c less direct sunlight and sturdier soils)
Original Pop = 200
40 - 55
Original population = 200 000
Natality = 15 000
Mortality = 10 000
Immigration = 175 000
Emigration = 160 000
Calculate the per capita growth rate of a mouse population if the original population size is 34 and over a period of a week, 5 die, 8 are born, 12 immigrate into and 7 emigrate out of the area.
1. Open populations:
2. Closed populations:
4 distinct phases
Wide base…fast growth
What are these graphs showing?
Density Dependent Factor!
r - selected
K - selected