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, Cos...
Main Authors: | , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Wiley
2019-05-01
|
Series: | Ecology and Evolution |
Subjects: | |
Online Access: | https://doi.org/10.1002/ece3.5155 |
id |
doaj-409b87ae13a640a0b214e8e8ca3046aa |
---|---|
record_format |
Article |
spelling |
doaj-409b87ae13a640a0b214e8e8ca3046aa2021-03-02T04:59:58ZengWileyEcology and Evolution2045-77582019-05-019105720573010.1002/ece3.5155Drivers of tropical rainforest composition and alpha diversity patterns over a 2,520 m altitudinal gradientDario Veintimilla0Marie Ange Ngo Bieng1Diego Delgado2Sergio Vilchez‐Mendoza3Nelson Zamora4Bryan Finegan5CATIE-Centro Agronómico Tropical de Investigación y Enseñanza Turrialba Costa RicaCATIE-Centro Agronómico Tropical de Investigación y Enseñanza Turrialba Costa RicaCATIE-Centro Agronómico Tropical de Investigación y Enseñanza Turrialba Costa RicaCATIE-Centro Agronómico Tropical de Investigación y Enseñanza Turrialba Costa RicaCATIE-Centro Agronómico Tropical de Investigación y Enseñanza Turrialba Costa RicaCATIE-Centro Agronómico Tropical de Investigación y Enseñanza Turrialba Costa RicaAbstract 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.https://doi.org/10.1002/ece3.5155alpha diversityBeta diversitydispersal assemblyHill numbersniche assemblyrarefaction‐extrapolation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Dario Veintimilla Marie Ange Ngo Bieng Diego Delgado Sergio Vilchez‐Mendoza Nelson Zamora Bryan Finegan |
spellingShingle |
Dario Veintimilla Marie Ange Ngo Bieng Diego Delgado Sergio Vilchez‐Mendoza Nelson Zamora Bryan Finegan Drivers of tropical rainforest composition and alpha diversity patterns over a 2,520 m altitudinal gradient Ecology and Evolution alpha diversity Beta diversity dispersal assembly Hill numbers niche assembly rarefaction‐extrapolation |
author_facet |
Dario Veintimilla Marie Ange Ngo Bieng Diego Delgado Sergio Vilchez‐Mendoza Nelson Zamora Bryan Finegan |
author_sort |
Dario Veintimilla |
title |
Drivers of tropical rainforest composition and alpha diversity patterns over a 2,520 m altitudinal gradient |
title_short |
Drivers of tropical rainforest composition and alpha diversity patterns over a 2,520 m altitudinal gradient |
title_full |
Drivers of tropical rainforest composition and alpha diversity patterns over a 2,520 m altitudinal gradient |
title_fullStr |
Drivers of tropical rainforest composition and alpha diversity patterns over a 2,520 m altitudinal gradient |
title_full_unstemmed |
Drivers of tropical rainforest composition and alpha diversity patterns over a 2,520 m altitudinal gradient |
title_sort |
drivers of tropical rainforest composition and alpha diversity patterns over a 2,520 m altitudinal gradient |
publisher |
Wiley |
series |
Ecology and Evolution |
issn |
2045-7758 |
publishDate |
2019-05-01 |
description |
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. |
topic |
alpha diversity Beta diversity dispersal assembly Hill numbers niche assembly rarefaction‐extrapolation |
url |
https://doi.org/10.1002/ece3.5155 |
work_keys_str_mv |
AT darioveintimilla driversoftropicalrainforestcompositionandalphadiversitypatternsovera2520maltitudinalgradient AT marieangengobieng driversoftropicalrainforestcompositionandalphadiversitypatternsovera2520maltitudinalgradient AT diegodelgado driversoftropicalrainforestcompositionandalphadiversitypatternsovera2520maltitudinalgradient AT sergiovilchezmendoza driversoftropicalrainforestcompositionandalphadiversitypatternsovera2520maltitudinalgradient AT nelsonzamora driversoftropicalrainforestcompositionandalphadiversitypatternsovera2520maltitudinalgradient AT bryanfinegan driversoftropicalrainforestcompositionandalphadiversitypatternsovera2520maltitudinalgradient |
_version_ |
1724242787849732096 |