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Drivers of tropical rainforest composition and alpha diversity patterns over a 2,520 m altitudinal gradient

Veintimilla Dario, Ngo Bieng Marie-Ange, Delgado Diego, Vilchez Mendoza Sergio José, Zamora Nelson, Finegan Bryan. 2019. Drivers of tropical rainforest composition and alpha diversity patterns over a 2,520 m altitudinal gradient. Ecology and Evolution, 9 (10) : pp. 5720-5730.

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Quartile : Q2, Sujet : ECOLOGY / Quartile : Q3, Sujet : EVOLUTIONARY BIOLOGY

Abstract : Aim: We sought to determine the relationship of forest composition and alpha diversity (the species diversity of a local assemblage) to altitude, soil, and spatial factors over a 440–2,950 m a.s.l gradient. Location: Altitudinal gradient on the Caribbean slope of the Talamanca Cordillera, Costa Rica. Taxon: Angiosperm and gymnosperm trees, palms, and tree ferns. Methods: We measured and identified all stems ≥10 cm dbh in 32 0.25‐ha undisturbed rain forest plots over the gradient. We determined compositional patterns using Non‐Metric Multidimensional Scaling (NMS) ordination, and used linear regressions to explore the relationship between four alpha diversity metrics and altitude. With variation partitioning (VARPART), we determined the compositional variation explained by altitude, soil, and spatial variables quantified using Principle Components of Neighbor matrices. Results: We identified 425 species. NMS axis 1 separated a lowland zone (440–1,120 m asl) from a transitional one dominated by holarctic Oreomunnea mexicana (1,400–1,600 m asl) and Quercus‐dominated forests at altitudes >2,100 m asl. The lowland zone was separated into two clusters of plots on NMS axis 2, the first in the 430–620 m asl range and the second at 1,000–1,120 masl. Regressions showed that all alpha diversity metrics were strongly negatively related to altitude (R2 > 0.78). Overall, adjusted R2 from VARPART was 0.43, with 0.30, 0.21, and 0.17 for altitude, soil, and space respectively. The respective adjusted R2 of individual matrices, on controlling for the other two, was 0.06, 0.05 and 0.09 (p < 0.001). Main conclusions: There are two well‐defined forest compositional zones on this gradient—lowlands 430–1,120 m asl and montane forests >2,150 m asl—with a transitional zone at 1,400–1,600 m asl, where lowland tropical and montane holarctic species are found together. Montane forests are very distinct in their composition and low alpha diversity. Vegetation and soil respond to altitude, and therefore temperature, as an integrated system, a model that goes beyond niche assembly as shown by the significant effect of space in the VARPART.

Mots-clés Agrovoc : Forêt tropicale humide, Altitude, Composition botanique, biodiversité forestière, Sol, Quercus

Mots-clés géographiques Agrovoc : Costa Rica

Mots-clés complémentaires : Oreomunnea mexicana

Mots-clés libres : Alpha diversity, Beta diversity, Dispersal assembly, Hill numbers, Niche assembly, Rarefaction extrapolation, Tropical mountain forest

Classification Agris : K01 - Forestry - General aspects
F40 - Plant ecology
F70 - Plant taxonomy and geography

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

Auteurs et affiliations

  • Veintimilla Dario, CATIE (CRI)
  • Ngo Bieng Marie-Ange, CIRAD-ES-UPR Forêts et sociétés (CRI) - auteur correspondant
  • Delgado Diego, CATIE (CRI)
  • Vilchez Mendoza Sergio José, CATIE (CRI)
  • Zamora Nelson, CATIE (CRI)
  • Finegan Bryan, CATIE (CRI)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/593249/)

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