Extinction rates on islands are related to the size of the island. ... Can raise more young if they migrate than if they stayed in the tropics. ...
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Bottom Up Control resources control community
N V H P
Top Down Control Predators control the community
N V H P
Top down control = Trophic Cascade Model
Freshwater Pond For Example:
Phytoplankton Zooplankton Small Fish Large Fish
Remove large fish then small fish increase, zooplankton decreases and phytoplankton increases.
Effects will be propagated up and down food chain as a +/-