APES Unit 2.3
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9 Terms
1
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What is Island Biogeography?
The study of the ecological relationships, distribution of organisms on islands, and the community structures present.
2
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What are the two basic “rules” of Island Biogeography?
1\.) The larger the island, the more species it can support.
2\.) The closer an island is to the mainland, the more species it can support.
2\.) The closer an island is to the mainland, the more species it can support.
3
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The larger an island, the greater the ______.
Ecosystem diversity.
4
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More ecosystem diversity = ?
More food, habitat resources, and niches (Galapagos Islands.
5
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Larger islands = ?
Larger population sizes (increased genetic diversity) and a lower extinction rate.
6
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There is a positive correlation between .. and ..?
Island size and species richness.
7
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The closer the island is to the mainland, the .. ? (3)
* Higher the species richness
* Easier for more species to migrate to island from mainland
* More frequent migration of individuals to the island habitat
* Easier for more species to migrate to island from mainland
* More frequent migration of individuals to the island habitat
8
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There is an inverse relationship between … and … ?
Island distance from mainland and species richness.
9
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How are islands colonized?
A single colonizing species from the mainland arrives and quickly evolves into many slightly different species in order to adapt to the island’s conditions.