[1] Columbia Univ, Dept Ecol Evolut & Environm Biol, New York, NY 10027 USA
[2] Uppsala Univ, Dept Plant Ecol & Evolut, Uppsala, Sweden
[3] Univ Michigan, Ecol & Evolutionary Biol, Ann Arbor, MI 48109 USA
[4] Smithsonian Trop Res Inst, ForestGEO, Washington, DC USA
[5] Ctr Ecol & Hydrol, Bush Estate, Penicuik EH26 0QB, Midlothian, Scotland
[6] Univ Puerto Rico, Dept Environm Sci, San Juan, PR USA