Variation in wood density across South American tropical forests ‌ Sullivan, MJP, Phillips, OL, Galbraith, D, Almeida, E, de Oliveira, EA, Almeida, J, Dávila, EÁ, Alves, LF, Andrade, A, Aragão, L, Araujo-Murakami, A, Arets, E, Arroyo, L, Cruz, OAM, Baccaro, F, Baker, TR, Banki, O, Baraloto, C, Barlow, J, Barroso, J, Berenguer, E, Blanc, L, Blundo, C, Bonal, D, Huasco, WH, Malhi, Y