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Article Dans Une Revue Ecology Letters Année : 2019

Scaling issues of neutral theory reveal violations of ecological equivalence for dominant Amazonian tree species

Edwin Pos
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Olaf S. Bánki
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Hugo F. Mogollón
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Carlos Cerón
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Marcos Rios Paredes
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Percy Nuñez Vargas
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Nállarett Dávila
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Anthony Di Fiore
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Gonzalo Rivas-Torres
Raquel Thomas-Caesar
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Corine Vriesendorp
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Kenneth R Young
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Milton Tirado
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Italo Mesones
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Roderick Zagt
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Manuel Ahuite Reategui
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Walter Palacios Cuenca
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Elvis H. Valderrama Sandoval
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Résumé

Neutral models are often used as null models, testing the relative importance of niche versus neutral processes in shaping diversity. Most versions, however, focus only on regional scale predictions and neglect local level contributions. Recently, a new formulation of spatial neutral theory was published showing an incompatibility between regional and local scale fits where especially the number of rare species was dramatically under-predicted. Using a forward in time semi-spatially explicit neutral model and a unique large-scale Amazonian tree inventory data set, we show that neutral theory not only underestimates the number of rare species but also fails in predicting the excessive dominance of species on both regional and local levels. We show that although there are clear relationships between species composition, spatial and environmental distances, there is also a clear differentiation between species able to attain dominance with and without restriction to specific habitats. We conclude therefore that the apparent dominance of these species is real, and that their excessive abundance can be attributed to fitness differences in different ways, a clear violation of the ecological equivalence assumption of neutral theory.
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Dates et versions

hal-02164675 , version 1 (25-06-2019)

Identifiants

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Edwin Pos, Juan Ernesto Guevara, Jean-François Molino, Daniel Sabatier, Olaf S. Bánki, et al.. Scaling issues of neutral theory reveal violations of ecological equivalence for dominant Amazonian tree species. Ecology Letters, 2019, 22 (7), pp.1072-1082. ⟨10.1111/ele.13264⟩. ⟨hal-02164675⟩
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