The number of tree species on Earth

Gatti, Roberto Cazzolla; Reich, Peter B.; Gamarra, Javier G. P.; Crowther, Tom; Hui, Cang; Morera, Albert; Bastin, Jean-Francois; de-Miguel, Sergio; Nabuurs, Gert-Jan; Svenning, Jens-Christian; Serra-Diaz, Josep M.; Merow, Cory; Enquist, Brian; Kamenetsky, Maria; Lee, Junho; Zhu, Jun; Fang, Jinyun; Jacobs, Douglass F.; Pijanowski, Bryan; Banerjee, Arindam; Giaquinto, Robert A.; Alberti, Giorgio; Almeyda Zambrano, Angelica Maria; Alvarez-Davila, Esteban; Araujo-Murakami, Alejandro; Avitabile, Valerio; Aymard, Gerardo A.; Balazy, Radomir; Baraloto, Chris; Barroso, Jorcely G.; Bastian, Meredith L.; Birnbaum, Philippe; Bitariho, Robert; Bogaert, Jan; Bongers, Frans; Bouriaud, Olivier; Brancalion, Pedro H. S.; Brearley, Francis Q.; Broadbent, Eben North; Bussotti, Filippo; Castro da Silva, Wendeson; Gomes Cesar, Ricardo; Cesljar, Goran; Moscoso, Victor Chama; Chen, Han Y. H.; Cienciala, Emil; Clark, Connie J.; Coomes, David A.; Dayanandan, Selvadurai; Decuyper, Mathieu; Dee, Laura E.; Del Aguila Pasquel, Jhon; Derroire, Geraldine; Djuikouo, Marie Noel Kamdem; Tran Van Do; Dolezal, Jiri; Dordevic, Ilija D.; Engel, Julien; Fayle, Tom M.; Feldpausch, Ted R.; Fridman, Jonas K.; Harris, David J.; Hemp, Andreas; Hengeveld, Geerten; Herault, Bruno; Herold, Martin; Ibanez, Thomas; Jagodzinski, Andrzej M.; Jaroszewicz, Bogdan; Jeffery, Kathryn J.; Johannsen, Vivian Kvist; Jucker, Tommaso; Kangur, Ahto; Karminov, Victor N.; Kartawinata, Kuswata; Kennard, Deborah K.; Kepfer-Rojas, Sebastian; Keppel, Gunnar; Khan, Mohammed Latif; Khare, Pramod Kumar; Kileen, Timothy J.; Kim, Hyun Seok; Korjus, Henn; Kumar, Amit; Kumar, Ashwani; Laarmann, Diana; Labriere, Nicolas; Lang, Mait; Lewis, Simon L.; Lukina, Natalia; Maitner, Brian S.; Malhi, Yadvinder; Marshall, Andrew R.; Martynenko, Olga V.; Mendoza, Abel L. Monteagudo; Ontikov, Petr V.; Ortiz-Malavasi, Edgar; Camacho, Nadir C. Pallqui; Paquette, Alain; Park, Minjee; Parthasarathy, Narayanaswamy; Peri, Pablo Luis; Petronelli, Pascal; Pfautsch, Sebastian; Phillips, Oliver L.; Picard, Nicolas; Piotto, Daniel; Poorter, Lourens; Poulsen, John R.; Pretzsch, Hans; Ramirez-Angulo, Hirma; Correa, Zorayda Restrepo; Rodeghiero, Mirco; Gonzales, Rocio Del Pilar Rojas; Rolim, Samir G.; Rovero, Francesco; Rutishauser, Ervan; Saikia, Purabi; Salas-Eljatib, Christian; Schepaschenko, Dmitry; Scherer-Lorenzen, Michael; Seben, Vladimir; Silveira, Marcos; Slik, Ferry; Sonke, Bonaventure; Souza, Alexandre F.; Sterenczak, Krzysztof Jan; Svoboda, Miroslav; Taedoumg, Hermann; Tchebakova, Nadja; Terborgh, John; Tikhonova, Elena; Torres-Lezama, Armando; van der Plas, Fons; Vasquez, Rodolfo; Viana, Helder; Vibrans, Alexander C.; Vilanova, Emilio; Vos, Vincent A.; Wang, Hua-Feng; Westerlund, Bertil; White, Lee J. T.; Wiser, Susan K.; Zawila-Niedzwiecki, Tomasz; Zemagho, Lise; Zhu, Zhi-Xin; Zo-Bi, Irie C.; Liang, Jingjing

doi:10.1073/pnas.2115329119

Research article2022Peer reviewedOpen access

The number of tree species on Earth

Gatti, Roberto Cazzolla; Reich, Peter B.; Gamarra, Javier G. P.; Crowther, Tom; Hui, Cang; Morera, Albert; Bastin, Jean-Francois; de-Miguel, Sergio; Nabuurs, Gert-Jan; Svenning, Jens-Christian; Serra-Diaz, Josep M.; Merow, Cory; Enquist, Brian; Kamenetsky, Maria; Lee, Junho; Zhu, Jun; Fang, Jinyun; Jacobs, Douglass F.; Pijanowski, Bryan; Banerjee, Arindam; Giaquinto, Robert A.; Alberti, Giorgio; Almeyda Zambrano, Angelica Maria; Alvarez-Davila, Esteban; Araujo-Murakami, Alejandro; Avitabile, Valerio; Aymard, Gerardo A.; Balazy, Radomir; Baraloto, Chris; Barroso, Jorcely G.; Bastian, Meredith L.; Birnbaum, Philippe; Bitariho, Robert; Bogaert, Jan; Bongers, Frans; Bouriaud, Olivier; Brancalion, Pedro H. S.; Brearley, Francis Q.; Broadbent, Eben North; Bussotti, Filippo; Castro da Silva, Wendeson; Gomes Cesar, Ricardo; Cesljar, Goran; Moscoso, Victor Chama; Chen, Han Y. H.; Cienciala, Emil; Clark, Connie J.; Coomes, David A.; Dayanandan, Selvadurai; Decuyper, Mathieu; Dee, Laura E.; Del Aguila Pasquel, Jhon; Derroire, Geraldine; Djuikouo, Marie Noel Kamdem; Tran Van Do; Dolezal, Jiri; Dordevic, Ilija D.; Engel, Julien; Fayle, Tom M.; Feldpausch, Ted R.; Fridman, Jonas K.; Harris, David J.; Hemp, Andreas; Hengeveld, Geerten; Herault, Bruno; Herold, Martin; Ibanez, Thomas; Jagodzinski, Andrzej M.; Jaroszewicz, Bogdan; Jeffery, Kathryn J.; Johannsen, Vivian Kvist; Jucker, Tommaso; Kangur, Ahto; Karminov, Victor N.; Kartawinata, Kuswata; Kennard, Deborah K.; Kepfer-Rojas, Sebastian; Keppel, Gunnar; Khan, Mohammed Latif; Khare, Pramod Kumar; Kileen, Timothy J.; Kim, Hyun Seok; Korjus, Henn; Kumar, Amit; Kumar, Ashwani; Laarmann, Diana; Labriere, Nicolas; Lang, Mait; Lewis, Simon L.; Lukina, Natalia; Maitner, Brian S.; Malhi, Yadvinder; Marshall, Andrew R.; Martynenko, Olga V.; Mendoza, Abel L. Monteagudo; Ontikov, Petr V.; Ortiz-Malavasi, Edgar; Camacho, Nadir C. Pallqui; Paquette, Alain; Park, Minjee; Parthasarathy, Narayanaswamy; Peri, Pablo Luis; Petronelli, Pascal; Pfautsch, Sebastian; Phillips, Oliver L.; Picard, Nicolas; Piotto, Daniel; Poorter, Lourens; Poulsen, John R.; Pretzsch, Hans; Ramirez-Angulo, Hirma; Correa, Zorayda Restrepo; Rodeghiero, Mirco; Gonzales, Rocio Del Pilar Rojas; Rolim, Samir G.; Rovero, Francesco; Rutishauser, Ervan; Saikia, Purabi; Salas-Eljatib, Christian; Schepaschenko, Dmitry; Scherer-Lorenzen, Michael; Seben, Vladimir; Silveira, Marcos; Slik, Ferry; Sonke, Bonaventure; Souza, Alexandre F.; Sterenczak, Krzysztof Jan; Svoboda, Miroslav; Taedoumg, Hermann; Tchebakova, Nadja; Terborgh, John; Tikhonova, Elena; Torres-Lezama, Armando; van der Plas, Fons; Vasquez, Rodolfo; Viana, Helder; Vibrans, Alexander C.; Vilanova, Emilio; Vos, Vincent A.; Wang, Hua-Feng; Westerlund, Bertil; White, Lee J. T.; Wiser, Susan K.; Zawila-Niedzwiecki, Tomasz; Zemagho, Lise; Zhu, Zhi-Xin; Zo-Bi, Irie C.; Liang, Jingjing
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Abstract

One of the most fundamental questions in ecology is how many species inhabit the Earth. However, due to massive logistical and financial challenges and taxonomic difficulties connected to the species concept definition, the global numbers of species, including those of important and well-studied life forms such as trees, still remain largely unknown. Here, based on global groundsourced data, we estimate the total tree species richness at global, continental, and biome levels. Our results indicate that there are 73,000 tree species globally, among which ∼9,000 tree species are yet to be discovered. Roughly 40% of undiscovered tree species are in South America. Moreover, almost one-third of all tree species to be discovered may be rare, with very low populations and limited spatial distribution (likely in remote tropical lowlands and mountains). These findings highlight the vulnerability of global forest biodiversity to anthropogenic changes in land use and climate, which disproportionately threaten rare species and thus, global tree richness.

Keywords

biodiversity; forests; hyperdominance; rarity; richness

Published in

Proceedings of the National Academy of Sciences of the United States of America
2022, volume: 119, number: 6, article number: e2115329119

SLU Authors

Fridman, Jonas
- Department of Forest Resource Management, Swedish University of Agricultural Sciences
Westerlund, Bertil
- Department of Forest Resource Management, Swedish University of Agricultural Sciences

Associated SLU-program

SLU Forest Damage Center

Global goals (SDG)

SDG15 Life on land

UKÄ Subject classification

Forest Science
Ecology
Botany

Publication identifier

DOI: https://doi.org/10.1073/pnas.2115329119

Permanent link to this page (URI)

https://res.slu.se/id/publ/115835