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Dominant tree species drive beta diversity patterns in western Amazonia

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Author(s)

Frederick C Draper, Gregory P. Asner, Eurídice N. Honorio Coronado, Timothy R. Baker, Roosevelt García-Villacorta, Nigel C. A. Pitman, Paul V.A. Fine, Oliver L. Phillips, Ricardo Zárate Gómez, Carlos A. Amasifuén Guerra, Manuel Flores Arévalo, Rodolfo Vásquez Martínez, Roel J.W Brienen, Abel Monteagudo-Mendoza, Luis A. Torres Montenegro, Elvis Valderrama Sandoval, Katherine H. Roucoux, Fredy R. Ramírez Arévalo, Ítalo Mesones Acuy, Jhon Del Aguila Pasquel & 5 others Ximena Tagle Casapia, Gerardo Flores Llampazo, Massiel Corrales Medina, José Reyna Huaymacari, Christopher Baraloto

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Abstract

The forests of western Amazonia are among the most diverse tree communities on Earth, yet this exceptional diversity is distributed highly unevenly within- and among communities. In particular, a small number of dominant species account for the majority of individuals while the large majority of species are locally and regionally extremely scarce. By definition, dominant species contribute little to local species richness (alpha diversity), yet the importance of dominant species in structuring patterns of spatial floristic turnover (beta diversity) has not been investigated. Here, using a network of 207 forest inventory plots, we explore the role of dominant species in determining regional patterns of beta diversity (community-level floristic turnover and distance-decay relationships) across a range of habitat types in northern lowland Peru. Of the 2031 recorded species in our dataset, only 99 of them accounted for 50% of individuals. Using these 99 species it was possible to reconstruct the overall features of regional beta diversity patterns, including the location and dispersion of habitat types in multivariate space, and distance-decay relationships. In fact, our analysis demonstrated that regional patterns of beta diversity were better maintained by the 99 dominant species than by the 1932 others, whether quantified using species abundance data or species presence/absence data. Our results reveal that dominant species are normally common only in a single forest type. Therefore, dominant species play a key role in structuring Western Amazonian tree communities, which in turn has important implications, both practically for designing effective protected areas, and more generally for understanding the determinants of beta diversity patterns.
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Original languageEnglish
Article numbere02636
JournalEcology
Volume100
Issue number4
Early online date28 Feb 2019
DOIs
Publication statusPublished - 1 Apr 2019

    Research areas

  • Dominance, Beta diversity, Western Amazonia, Species turnover, Tree species, Common species, Rare species, Tropical forest communities, Loreto, Habitat specificity

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