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No detectada	desde mar. 1997 / hasta dic. 2023	Science Journals

Información

Tipo de recurso:

revistas

ISSN impreso

0036-8075

ISSN electrónico

1095-9203

Editor responsable

American Association for the Advancement of Science (AAAS)

País de edición

Estados Unidos

Fecha de publicación

1880-

Cobertura temática

Ciencias naturales

Tabla de contenidos

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doi: 10.1126/science.342.6155.265-b

Science Podcast: 11 October Show

<jats:p>Listen to stories about gaps in the evidence for newborn screenings, the formation of the moon, removing nitrogen from lakes, and more.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 265-265

doi: 10.1126/science.342.6155.265-a

New Products

<jats:p>A weekly roundup of information on newly offered instrumentation, apparatus, and laboratory materials of potential interest to researchers.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 265-265

doi: 10.1126/science.1243092

Hyperdominance in the Amazonian Tree Flora

Hans ter Steege; Nigel C. A. Pitman; Daniel Sabatier; Christopher Baraloto; Rafael P. Salomão; Juan Ernesto Guevara; Oliver L. Phillips; Carolina V. Castilho; William E. Magnusson; Jean-François Molino; Abel Monteagudo; Percy Núñez Vargas; Juan Carlos Montero; Ted R. Feldpausch; Eurídice N. Honorio Coronado; Tim J. Killeen; Bonifacio Mostacedo; Rodolfo Vasquez; Rafael L. Assis; John Terborgh; Florian Wittmann; Ana Andrade; William F. Laurance; Susan G. W. Laurance; Beatriz S. Marimon; Ben-Hur Marimon; Ima Célia Guimarães Vieira; Iêda Leão Amaral; Roel Brienen; Hernán Castellanos; Dairon Cárdenas López; Joost F. Duivenvoorden; Hugo F. Mogollón; Francisca Dionízia de Almeida Matos; Nállarett Dávila; Roosevelt García-Villacorta; Pablo Roberto Stevenson Diaz; Flávia Costa; Thaise Emilio; Carolina Levis; Juliana Schietti; Priscila Souza; Alfonso Alonso; Francisco Dallmeier; Alvaro Javier Duque Montoya; Maria Teresa Fernandez Piedade; Alejandro Araujo-Murakami; Luzmila Arroyo; Rogerio Gribel; Paul V. A. Fine; Carlos A. Peres; Marisol Toledo; Gerardo A. Aymard C.; Tim R. Baker; Carlos Cerón; Julien Engel; Terry W. Henkel; Paul Maas; Pascal Petronelli; Juliana Stropp; Charles Eugene Zartman; Doug Daly; David Neill; Marcos Silveira; Marcos Ríos Paredes; Jerome Chave; Diógenes de Andrade Lima Filho; Peter Møller Jørgensen; Alfredo Fuentes; Jochen Schöngart; Fernando Cornejo Valverde; Anthony Di Fiore; Eliana M. Jimenez; Maria Cristina Peñuela Mora; Juan Fernando Phillips; Gonzalo Rivas; Tinde R. van Andel; Patricio von Hildebrand; Bruce Hoffman; Eglée L. Zent; Yadvinder Malhi; Adriana Prieto; Agustín Rudas; Ademir R. Ruschell; Natalino Silva; Vincent Vos; Stanford Zent; Alexandre A. Oliveira; Angela Cano Schutz; Therany Gonzales; Marcelo Trindade Nascimento; Hirma Ramirez-Angulo; Rodrigo Sierra; Milton Tirado; María Natalia Umaña Medina; Geertje van der Heijden; César I. A. Vela; Emilio Vilanova Torre; Corine Vriesendorp; Ophelia Wang; Kenneth R. Young; Claudia Baider; Henrik Balslev; Cid Ferreira; Italo Mesones; Armando Torres-Lezama; Ligia Estela Urrego Giraldo; Roderick Zagt; Miguel N. Alexiades; Lionel Hernandez; Isau Huamantupa-Chuquimaco; William Milliken; Walter Palacios Cuenca; Daniela Pauletto; Elvis Valderrama Sandoval; Luis Valenzuela Gamarra; Kyle G. Dexter; Ken Feeley; Gabriela Lopez-Gonzalez; Miles R. Silman

<jats:sec> <jats:title>Introduction</jats:title> <jats:p>Recent decades have seen a major international effort to inventory tree communities in the Amazon Basin and Guiana Shield (Amazonia), but the vast extent and record diversity of these forests have hampered an understanding of basinwide patterns. To overcome this obstacle, we compiled and standardized species-level data on more than half a million trees in 1170 plots sampling all major lowland forest types to explore patterns of commonness, rarity, and richness.</jats:p> </jats:sec> <jats:sec> <jats:title>Methods</jats:title> <jats:p> The ~6-million-km <jats:sup>2</jats:sup> Amazonian lowlands were divided into 1Â° cells, and mean tree density was estimated for each cell by using a loess regression model that included no environmental data but had its basis exclusively in the geographic location of tree plots. A similar model, allied with a bootstrapping exercise to quantify sampling error, was used to generate estimated Amazon-wide abundances of the 4962 valid species in the data set. We estimated the total number of tree species in the Amazon by fitting the mean rank-abundance data to Fisherâ€™s log-series distribution. </jats:p> </jats:sec> <jats:sec> <jats:title>Results</jats:title> <jats:p> Our analyses suggest that lowland Amazonia harbors 3.9 Ã— 10 <jats:sup>11</jats:sup> trees and ~16,000 tree species. We found 227 â€œhyperdominantâ€ species (1.4% of the total) to be so common that together they account for half of all trees in Amazonia, whereas the rarest 11,000 species account for just 0.12% of trees. Most hyperdominants are habitat specialists that have large geographic ranges but are only dominant in one or two regions of the basin, and a median of 41% of trees in individual plots belong to hyperdominants. A disproportionate number of hyperdominants are palms, Myristicaceae, and Lecythidaceae. </jats:p> </jats:sec> <jats:sec> <jats:title>Discussion</jats:title> <jats:p>The finding that Amazonia is dominated by just 227 tree species implies that most biogeochemical cycling in the worldâ€™s largest tropical forest is performed by a tiny sliver of its diversity. The causes underlying hyperdominance in these species remain unknown. Both competitive superiority and widespread pre-1492 cultivation by humans are compelling hypotheses that deserve testing. Although the data suggest that spatial models can effectively forecast tree community composition and structure of unstudied sites in Amazonia, incorporating environmental data may yield substantial improvements. An appreciation of how thoroughly common species dominate the basin has the potential to simplify research in Amazonian biogeochemistry, ecology, and vegetation mapping. Such advances are urgently needed in light of the >10,000 rare, poorly known, and potentially threatened tree species in the Amazon.</jats:p> </jats:sec>

Palabras clave: Multidisciplinary.

Pp. No disponible

doi: 10.1126/science.342.6156.288-i