some basic stats. on species richness:
>1/3 of ALL PLANT SPP. live in tropical forests
(though not all are forest endemics)
but these forests occupy <1/10 land area
Amazonia - ~1 million plant species
Asia - ~3/4 million plant species
Africa - ~1/3 million plant species
>>100 tree species/ha.
10,000-100,000 animal species/ha
>1/3 of all bird species are Neotropical;
about 50% are forest endemics
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