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Unformatted text preview: ation sizes.
Predation - predation (being eaten) by a predator animal (e.g. shark, hawk, etc) can regulate population sizes.
Characteristics of populations
• Resource limitation
121 Each pair of woodpeckers requires a tree hole to raise offspring.
121 If there are more holes than pairs, every pair gets a hole.
If there are fewer holes than pairs, some pairs do not get a hole and do not reproduce. Ecology of ecosystem
• Ecosystem more inclusive than a community
Includes interactions with physical environment • How an organism acquires food
Autotroph - creates food from inorganic sources
I Heterotroph - eats other organic materials (living...
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- Fall '09