Orthogenesis - “Straight-line evolution,” held that the variation that arises is directed toward fixed goals.

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#Id: 3054

#Unit 10. Ecological Principles

The number of species should decrease with increasing distance of the island from the mainland - The species distance hypothesis

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#Id: 3055

#Unit 10. Ecological Principles

The number of species should increase with increasing island size. This is also known as the species-area hypothesis.

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#Id: 3056

#Unit 10. Ecological Principles

Larger populations are more resistant to extinctions.

Greater ranges of habitats promote increased speciation rates.

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#Id: 3057

#Unit 10. Ecological Principles

Fast generation and high mutation rate in tropical leads to greater evolution rate. 

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#Id: 3058

#Unit 10. Ecological Principles

Area is directly proportional to the number of species.

Tropical have highest species due to the area.

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#Id: 3059

#Unit 10. Ecological Principles

The species-area hypothesis S = c Az