An estimate of the number of tropical tree species. Slik, J. W. F., Arroyo-Rodríguez, V., Aiba, S., Alvarez-Loayza, P., Alves, L. F., Ashton, P., Balvanera, P., Bastian, M. L., Bellingham, P. J., van den Berg, E., Bernacci, L., da Conceição Bispo, P., Blanc, L., Böhning-Gaese, K., Boeckx, P., Bongers, F., Boyle, B., Bradford, M., Brearley, F. Q., Breuer-Ndoundou Hockemba, M., Bunyavejchewin, S., Calderado Leal Matos, D., Castillo-Santiago, M., Catharino, E. L. M., Chai, S., Chen, Y., Colwell, R. K., Chazdon, R. L., Clark, C., Clark, D. B., Clark, D. A., Culmsee, H., Damas, K., Dattaraja, H. S., Dauby, G., Davidar, P., DeWalt, S. J., Doucet, J., Duque, A., Durigan, G., Eichhorn, K. A. O., Eisenlohr, P. V., Eler, E., Ewango, C., Farwig, N., Feeley, K. J., Ferreira, L., Field, R., de Oliveira Filho, A. T., Fletcher, C., Forshed, O., Franco, G., Fredriksson, G., Gillespie, T., Gillet, J., Amarnath, G., Griffith, D. M., Grogan, J., Gunatilleke, N., Harris, D., Harrison, R., Hector, A., Homeier, J., Imai, N., Itoh, A., Jansen, P. A., Joly, C. A., de Jong, B. H. J., Kartawinata, K., Kearsley, E., Kelly, D. L., Kenfack, D., Kessler, M., Kitayama, K., Kooyman, R., Larney, E., Laumonier, Y., Laurance, S., Laurance, W. F., Lawes, M. J., Amaral, I. L. d., Letcher, S. G., Lindsell, J., Lu, X., Mansor, A., Marjokorpi, A., Martin, E. H., Meilby, H., Melo, F. P. L., Metcalfe, D. J., Medjibe, V. P., Metzger, J. P., Millet, J., Mohandass, D., Montero, J. C., de Morisson Valeriano, M., Mugerwa, B., Nagamasu, H., Nilus, R., Ochoa-Gaona, S., Onrizal, Page, N., Parolin, P., Parren, M., Parthasarathy, N., Paudel, E., Permana, A., Piedade, M. T. F., Pitman, N. C. A., Poorter, L., Poulsen, A. D., Poulsen, J., Powers, J., Prasad, R. C., Puyravaud, J., Razafimahaimodison, J., Reitsma, J., dos Santos, J. R., Roberto Spironello, W., Romero-Saltos, H., Rovero, F., Rozak, A. H., Ruokolainen, K., Rutishauser, E., Saiter, F., Saner, P., Santos, B. A., Santos, F., Sarker, S. K., Satdichanh, M., Schmitt, C. B., Schöngart, J., Schulze, M., Suganuma, M. S., Sheil, D., da Silva Pinheiro, E., Sist, P., Stevart, T., Sukumar, R., Sun, I., Sunderland, T., Suresh, H. S., Suzuki, E., Tabarelli, M., Tang, J., Targhetta, N., Theilade, I., Thomas, D. W., Tchouto, P., Hurtado, J., Valencia, R., van Valkenburg, J. L. C. H., Van Do, T., Vasquez, R., Verbeeck, H., Adekunle, V., Vieira, S. A., Webb, C. O., Whitfeld, T., Wich, S. A., Williams, J., Wittmann, F., Wöll, H., Yang, X., Adou Yao, C. Y., Yap, S. L., Yoneda, T., Zahawi, R. A., Zakaria, R., Zang, R., de Assis, R. L., Garcia Luize, B., & Venticinque, E. M. Proceedings of the National Academy of Sciences, 112(24):7472–7477, June, 2015.
An estimate of the number of tropical tree species [link]Paper  doi  abstract   bibtex   
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.
@article{slikEstimateNumberTropical2015,
	title = {An estimate of the number of tropical tree species},
	volume = {112},
	url = {http://www.pnas.org/content/112/24/7472.abstract},
	doi = {10.1073/pnas.1423147112},
	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.},
	number = {24},
	journal = {Proceedings of the National Academy of Sciences},
	author = {Slik, J. W. Ferry and Arroyo-Rodríguez, Víctor and Aiba, Shin-Ichiro and Alvarez-Loayza, Patricia and Alves, Luciana F. and Ashton, Peter and Balvanera, Patricia and Bastian, Meredith L. and Bellingham, Peter J. and van den Berg, Eduardo and Bernacci, Luis and da Conceição Bispo, Polyanna and Blanc, Lilian and Böhning-Gaese, Katrin and Boeckx, Pascal and Bongers, Frans and Boyle, Brad and Bradford, Matt and Brearley, Francis Q. and Breuer-Ndoundou Hockemba, Mireille and Bunyavejchewin, Sarayudh and Calderado Leal Matos, Darley and Castillo-Santiago, Miguel and Catharino, Eduardo L. M. and Chai, Shauna-Lee and Chen, Yukai and Colwell, Robert K. and Chazdon, Robin L. and Clark, Connie and Clark, David B. and Clark, Deborah A. and Culmsee, Heike and Damas, Kipiro and Dattaraja, Handanakere S. and Dauby, Gilles and Davidar, Priya and DeWalt, Saara J. and Doucet, Jean-Louis and Duque, Alvaro and Durigan, Giselda and Eichhorn, Karl A. O. and Eisenlohr, Pedro V. and Eler, Eduardo and Ewango, Corneille and Farwig, Nina and Feeley, Kenneth J. and Ferreira, Leandro and Field, Richard and de Oliveira Filho, Ary T. and Fletcher, Christine and Forshed, Olle and Franco, Geraldo and Fredriksson, Gabriella and Gillespie, Thomas and Gillet, Jean-François and Amarnath, Giriraj and Griffith, Daniel M. and Grogan, James and Gunatilleke, Nimal and Harris, David and Harrison, Rhett and Hector, Andy and Homeier, Jürgen and Imai, Nobuo and Itoh, Akira and Jansen, Patrick A. and Joly, Carlos A. and de Jong, Bernardus H. J. and Kartawinata, Kuswata and Kearsley, Elizabeth and Kelly, Daniel L. and Kenfack, David and Kessler, Michael and Kitayama, Kanehiro and Kooyman, Robert and Larney, Eileen and Laumonier, Yves and Laurance, Susan and Laurance, William F. and Lawes, Michael J. and Amaral, Ieda Leao do and Letcher, Susan G. and Lindsell, Jeremy and Lu, Xinghui and Mansor, Asyraf and Marjokorpi, Antti and Martin, Emanuel H. and Meilby, Henrik and Melo, Felipe P. L. and Metcalfe, Daniel J. and Medjibe, Vincent P. and Metzger, Jean Paul and Millet, Jerome and Mohandass, D. and Montero, Juan C. and de Morisson Valeriano, Márcio and Mugerwa, Badru and Nagamasu, Hidetoshi and Nilus, Reuben and Ochoa-Gaona, Susana and {Onrizal} and Page, Navendu and Parolin, Pia and Parren, Marc and Parthasarathy, Narayanaswamy and Paudel, Ekananda and Permana, Andrea and Piedade, Maria T. F. and Pitman, Nigel C. A. and Poorter, Lourens and Poulsen, Axel D. and Poulsen, John and Powers, Jennifer and Prasad, Rama C. and Puyravaud, Jean-Philippe and Razafimahaimodison, Jean-Claude and Reitsma, Jan and dos Santos, João Roberto and Roberto Spironello, Wilson and Romero-Saltos, Hugo and Rovero, Francesco and Rozak, Andes Hamuraby and Ruokolainen, Kalle and Rutishauser, Ervan and Saiter, Felipe and Saner, Philippe and Santos, Braulio A. and Santos, Fernanda and Sarker, Swapan K. and Satdichanh, Manichanh and Schmitt, Christine B. and Schöngart, Jochen and Schulze, Mark and Suganuma, Marcio S. and Sheil, Douglas and da Silva Pinheiro, Eduardo and Sist, Plinio and Stevart, Tariq and Sukumar, Raman and Sun, I.-Fang and Sunderland, Terry and Suresh, H. S. and Suzuki, Eizi and Tabarelli, Marcelo and Tang, Jangwei and Targhetta, Natália and Theilade, Ida and Thomas, Duncan W. and Tchouto, Peguy and Hurtado, Johanna and Valencia, Renato and van Valkenburg, Johan L. C. H. and Van Do, Tran and Vasquez, Rodolfo and Verbeeck, Hans and Adekunle, Victor and Vieira, Simone A. and Webb, Campbell O. and Whitfeld, Timothy and Wich, Serge A. and Williams, John and Wittmann, Florian and Wöll, Hannsjoerg and Yang, Xiaobo and Adou Yao, C. Yves and Yap, Sandra L. and Yoneda, Tsuyoshi and Zahawi, Rakan A. and Zakaria, Rahmad and Zang, Runguo and de Assis, Rafael L. and Garcia Luize, Bruno and Venticinque, Eduardo M.},
	month = jun,
	year = {2015},
	pages = {7472--7477},
}

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