Dataset Information

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

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 (R ² > 0.78). Overall, adjusted R ² from VARPART was 0.43, with 0.30, 0.21, and 0.17 for altitude, soil, and space respectively. The respective adjusted R ² 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.

SUBMITTER: Veintimilla D

PROVIDER: S-EPMC6540655 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

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

Veintimilla Dario D Ngo Bieng Marie Ange MA Delgado Diego D Vilchez-Mendoza Sergio S Zamora Nelson N Finegan Bryan B

Ecology and evolution 20190416 10

<h4>Aim</h4>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.<h4>Location</h4>Altitudinal gradient on the Caribbean slope of the Talamanca Cordillera, Costa Rica.<h4>Taxon</h4>Angiosperm and gymnosperm trees, palms, and tree ferns.<h4>Methods</h4>We measured and identified all stems ≥10 cm dbh in 32 0.25-ha undisturbed rain forest plots over the ...[more]

PMID: 31160993

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Dataset Information

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

Aim

Location

Taxon

Methods

Results

Main conclusions

Publications

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

Similar Datasets

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