Amazon tree dominance across forest strata

Frederick C. Draper, Flavia R. C. Costa, Gabriel Arellano, Oliver L. Phillips, Alvaro Javier Duque Montoya, Manuel J. Macía, Hans ter Steege, Gregory P. Asner, Erika Berenguer, Juliana Schietti, Jacob B. Socolar, Fernanda Coelho de Souza, Kyle G. Dexter, Peter M. Jørgensen, J. Sebastian Tello, William E. Magnusson, , Timothy R. Baker, Carolina V. Castilho, Abel Monteagudo-MendozaPaul V. A. Fine, Kalle Ruokolainen, Euridice N. Honorio Coronado, Gerardo Aymard, Nállarett Dávila, Claire Fortunel, C. E. Timothy Paine, Jerôme Chave, Ted R. Feldpausch, Italo Mesones, André B. Junqueira, Katherine H. Roucoux, José J. de Toledo, Ana C. Andrade, José Luís Camargo, Jhon del Aguila Pasquel, Flávia D. Santana, William F. Laurance, Susan G. Laurance, Thomas E. Lovejoy, James A. Comiskey, David R. Galbraith, Michelle Kalamandeen, Gilberto E. Navarro Aguilar, Jim Vega Arenas, Carlos A. Amasifuen Guerra, Manuel Flores, Gerardo Flores Llampazo, Luis A. Torres Montenegro, Ricardo Zarate Gomez, Ana M. Aldana

Research output: Contribution to journalArticlepeer-review

Abstract

The forests of Amazonia are among the most biodiverse plant communities on Earth. Given the immediate threats posed by climate and land-use change, an improved understanding of how this extraordinary biodiversity is spatially organized is urgently required to develop effective conservation strategies. Most Amazonian tree species are extremely rare but a few are common across the region. Indeed, just 227 ‘hyperdominant’ species account for >50% of all individuals >10 cm diameter at 1.3 m in height. Yet, the degree to which the phenomenon of hyperdominance is sensitive to tree size, the extent to which the composition of dominant species changes with size class and how evolutionary history constrains tree hyperdominance, all remain unknown. Here, we use a large floristic dataset to show that, while hyperdominance is a universal phenomenon across forest strata, different species dominate the forest understory, midstory and canopy. We further find that, although species belonging to a range of phylogenetically dispersed lineages have become hyperdominant in small size classes, hyperdominants in large size classes are restricted to a few lineages. Our results demonstrate that it is essential to consider all forest strata to understand regional patterns of dominance and composition in Amazonia. More generally, through the lens of 654 hyperdominant species, we outline a tractable pathway for understanding the functioning of half of Amazonian forests across vertical strata and geographical locations.
Original languageEnglish (US)
Pages (from-to)757-767
Number of pages11
JournalNature Ecology and Evolution
Volume5
Issue number6
DOIs
StatePublished - 2021

Cite this