Slik, J.W. Ferry, Laurance, Susan, Laurance, William F., Arroyo-Rodríguez, Víctor , Aiba, Shin-Ichiro, Alvarez-Loayzad, Patricia, Alvez, Luciana F, Ashton, Peter, Balvanera, Patricia, Bastian, Meredith L. , Bellingham, Peter J. , van den Berg, Eduardo, Bernacci, Luis, da Conceição Bispo, Pollyanna, Blanc, Lillian, Böhning-Gaese, Katrin, Boeckx, Pascal, Bongers, Frans, Boyle, Brad, Bradford, Matt, Brearley, Francis Q., Breuer-Ndoundou Hockemba, Mirielle, Bunyavejchewins, Sarayudh , Calderado Leal Matos, Darley, Castillo-Santiagou, Miguel, Catharino, Eduardo L. M., Chai, Shauna-Lee, Chen, Yukai, Colwell, Robert K. , Chazdon, Robin L. , Clark, Connie, Clark, David B. , Clark, Deborah A. , Culmsee, Heike, Damas, Kipiro, Dattaraja, Handanakere S. , Dauby, Gilles, Priya, Davidar, Dewalt, Saara J. , Doucet, Jean-Louis, Duque, Alvaro, Durigan, Giselda, Eichhorn, Karl A.O., Eisenlohr, Pedro V. , Eler, Eduardo, Ewango, Cornielle, Farwig, Nina, Feeley, Kenneth J. , Ferriera, Leandro, Field, Richard, de Oliveira Filho, Ary T. , Fletcher, Christine, Forshed, Olle, Franco, Geraldo, Fredriksson, Gabriella, Gillespie, Thomas, Gillet, Jean-Francois, Giriraj, Amarnath, Griffith, David M., Grogan, James, Gunatilleke, Nimal, Harris, David, Harrison, Rhett, Hector, Andy, Homeier, Jurgen, Imai, Nubuo, Itoh, Akira, Jansen, Patrick A. , Joly, Carlos A. , de Jong, Bernardus H.J. , Kartawinata, Kuswata, Kearsley, Elizabeth, Kelly, Daniel L. , Kenfack, David, Kessler, Michael, Kitayama, Kanehiro, Kooyman, Robert, Larney, Eileen, Laumonier, Yves, Lawes, Michael J. , Leao do Amaral, Ieda, Letcher, Susan G. , Lindsell, Jeremy, Lu, Xinghui, Mansor, Asyraf, Marjokorpi, Antti, Martin, Emanuel H. , Meilby, Henrik, Melo, Felipe P.L. , Metcalfe, Daniel J. , Medjibe, Vincent P. , Metzger, Jean Paul, Millet, Jerome, Mohandass, D, Montero, Juan C. , de Morrison Valeriano, Marcio, Mugerwa, Badru, Nagamasu, Hidetoshi, Nilus, Reuben, Ochoa-Gaona, Susana, Page, Navendu, Parolin, Pia, Parren, Marc, Parthasarathy, Narayanaswamy, Paudel, Ekananda, Permana, Andrea, Piedade, Maria T.F., Pitman, Nigel C.A., Poorter, Lourens, Poulson, John, Powers, Jennifer, Prasad, Rama, Puyravaud, Jean-Phillipe, Razafimahaimodison, Jean-Claude, Reitzma, Jan, Roberto dos Santos, Joao, Roberto Spironello, Wilson, Romero-Saltos, Hugo, Rovero, Francesco, Rozak, Andes, Ruokolainen, Kalle, Rutishauser, Ervan, Saiter, Philippe, Saner, Filipe, Santos, Braulio, Santos, Fernanda, Sarker, Swapan, Satdichanh, Manichanh, Schmitt, Christine B. , Schongart, Jochen, Schulze, Mark, Suganuma, Marcio, Sheil, Douglas, da Silva Pinheiro, Eduardo, Sist, Plinio, Stevart, Tariq, Sukumar, Raman, Fang Sun, I, Sunderland, Terry, Suresh, H.S., Suzuki, Eizi, Tabarelli, Marcelo, Tang, Jangwei, Targhetta, Natalia, Theilade, Ida, Thomas, Duncan W. , Tchouto, Peguy, Hurtado, Johanna, Valencia, Renato, van Valkenberg, Johan, Van Do, Tran, Vasquez, Rodolfo, Verbeeck, Hans, Adekunle, Victor, Vieria, Simone A. , Webb, Campbell O. , Whitfield, Timothy, Wich, Serge, Williams, John, Wittman, Florian, Woll, Hannsjoerg, Yang, Xiaobo, Yao, Yves Adou, Yap, Sandra, Yoneda, Tsuyoshi, Zahawi, Rakan, Zakaria, Rahmad, Zang, Runguo, de Assis, Rafael, Garcia Luize, Bruno, and Venticinque, Eduardo (2015) An estimate of the number of tropical tree species. Proceedings of the National Academy of Sciences of the United States of America, 112 (33). pp. 7472-7477.

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Abstract

The high species richness of tropical forests has long been recognized, yet there remains substantial uncertainty regarding the actual number of tropical tree species. Using a pantropical tree inventory database from closed canopy forests, consisting of 657,630 trees belonging to 11,371 species, we use a fitted value of Fisher's alpha and an approximate pantropical stem total to estimate the minimum number of tropical forest tree species to fall between ~40,000 and ~53,000, i.e., at the high end of previous estimates. Contrary to common assumption, the Indo-Pacific region was found to be as species-rich as the Neotropics, with both regions having a minimum of ~19,000–25,000 tree species. Continental Africa is relatively depauperate with a minimum of ~4,500–6,000 tree species. Very few species are shared among the African, American, and the Indo-Pacific regions. We provide a methodological framework for estimating species richness in trees that may help refine species richness estimates of tree-dependent taxa.

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