In This Issue [This Week in PNAS]

ECOLOGY Trees aglow with the soft colors of autumn in Argentina. Image credit: iStock/ MarcioDufranc. Estimating the number of tree species on Earth Forests provide a wealth of ecosystem services and support much of terrestrial biodiversity. However, the number of tree species worldwide is unclear due to the uneven geographic...
Source: Proceedings of the National Academy of Sciences - Category: Science Tags: In This Issue This Week in PNAS Source Type: research