Term
¢Population ecologists can study changes in populations in hopes of answering…. |
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Definition
Relationships between species
Predicting future trends
Assess health of an entire species/population
Assess reality of endangerment
Etc |
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Term
| Types of Population Disperison |
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Definition
Clumped (most common)
Uniform
Random |
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Term
| Factors that Affect Population Change |
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Definition
Natality
Mortality
Immigration
Emmigration
¢∆N = [n + i] – [m + e] |
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Term
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Definition
Per capita growth rate – useful when comparing populations of different sizes
¢cgr = ∆N / N
∆N – change in population size
N – initial population size
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Term
| Interactions between two species can be classified into three basic categories |
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Definition
Symbiosis
Interspecific competiton
Predation |
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Term
| Competitive exclusion principle |
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Definition
| If resources are limited, no two species can remain in competition for exactly the same niche indefinitely (Gause’s principle) |
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Term
| Three types of defences prey adapt |
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Definition
◦Morphological defences
◦Chemical defences
◦Behavioural defences:
–Passive – i.e. hiding
–Active – i.e. Fleeing
–Mimicry |
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