Term
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Definition
- a wide base is indicative of a population growth in the future
- developing countries have pyramid shaped graphs
- developed countries have straighter graphs (no population growth = population will stay the same) |
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Term
| Population Growth Models (key) |
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Definition
Nt - pop at time t
No - original pop size
B - # of births
D - # of deaths
I - immigration
E - emigration
λ - geometric growth rate, replacement rate or (N(t+1))/Nt
r - intrinsic rate of natural increase or B-D per individual
k - carrying capacity |
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Term
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Definition
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Term
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Definition
Nt = Noλ^t
-discrete breeding
-non-overlapping generations |
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Term
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Definition
dN/dt = rN
-continuous breeding
-overlapping generations
-unlimited environment
J-shaped curve |
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Term
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Definition
dN/dt = rN (K-N /K)
-continuous breeding
-overlapping generations
-limited resources
S-shaped curve |
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Term
| intraspecific competition |
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Definition
| competition for resources w/in your own specie |
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