The decrease in species richness in North America

The species richness map shows historic and current species richness for 17 species that experienced range contractions over more than 20% of their historic range. The change map was created by subtracting the current from the historic species richness map.

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Alex E

Ecoclimax is defined by Odum (1969) as the culmination state after a succession in a stabilized ecosystem in which maximum biomass (or high information content) and symbiotic function among organisms is kept per unit of available energy flow.