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Maintained by the it ,i ■ NationalScianca J ■ Teachers Association figure 20-7

This species-richness map of North American and Central American birds shows that fewer than 100 species of birds inhabit arctic regions, whereas more than 600 species occupy some tropical regions. This evidence suggests that species richness increases closer to the equator. Equatorial rain forests are biologically the richest habitats on Earth.

figure 20-7

This species-richness map of North American and Central American birds shows that fewer than 100 species of birds inhabit arctic regions, whereas more than 600 species occupy some tropical regions. This evidence suggests that species richness increases closer to the equator. Equatorial rain forests are biologically the richest habitats on Earth.

figure 20-8

In a 1971 survey, the large islands of Cuba and Hispaniola each had about

100 species of reptiles and amphibians, whereas the small island of Redonda only had about 5 species. In general, species richness increases as available habitat increases. This principle is true for inland forests as well as islands.

Island Size Versus Species Richness

T3 i

{

| 100 -d

Hispaniola^^^^ Puerto Cu*a

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