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Unformatted text preview: h large transition zones between ecosystems.­ edges can have different combinations of species than either adjacent patch Edges are increasing due to fragmentation Measuring Species Diversity Measuring Species Diversity Generally see greater diversity in equatorial latitudes, decline toward poles­increase with increase sunlight, decreasing elevation In aquatic ecosystems­ greater diversity with depth, down to about 2000 meters, then decline Keystone and indicator species are critical The most Species–rich environments are: The most Species–rich environments are: Tropical Rainforests Coral reefs The deep sea Large tropical lakes These areas tend to have high species richness, but low abundance Types of species in an area Types of species in an area Native species Non­native species Keystone species Indicator species Indicator Species Indicator Species Early warning of damage to an ecosystem Birds­ tend to respond quickly to change Decline in songbird population indicative of habitat loss Decline in trout species, amphibians indicative of water pollution Keystone Sp...
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