Data from: Nitrogen-fixing tree abundance in higher-latitude North America is not constrained by diversity

Duncan N. L. Menge, Sarah A. Batterman, Wenying Liao, Benton N. Taylor, Jeremy W. Lichstein & Gregorio Ángeles-Pérez
The rarity of nitrogen (N)-fixing trees in frequently N-limited higher-latitude (here, > 35°) forests is a central biogeochemical paradox. One hypothesis for their rarity is that evolutionary constraints limit N-fixing tree diversity, preventing N-fixing species from filling available niches in higher-latitude forests. Here, we test this hypothesis using data from the USA and Mexico. N-fixing trees comprise only a slightly smaller fraction of taxa at higher vs. lower latitudes (8% vs. 11% of genera), despite...
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