The main criteria for megadiverse countries are endemism at the level of species, genera, and families. A megadiverse country must have: 1. At least, 5,000 species of endemic plants, and 2. marine ecosystems on its borders").

Map of megadiverse countries
Source: Wikipedia.org
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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.