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The Influence of Microtopography and Soil Properties on the Distribution of the Speciose Genus of Trees, Inga (Fabaceae:Mimosoidea), in Ecuadorian Amazonia

2010; Wiley; Volume: 43; Issue: 2 Linguagem: Inglês

10.1111/j.1744-7429.2010.00668.x

1744-7429

María‐José Endara, Jaime Jaramillo,

Plant Diversity and Evolution

BiotropicaVolume 43, Issue 2 p. 157-164 The Influence of Microtopography and Soil Properties on the Distribution of the Speciose Genus of Trees, Inga (Fabaceae:Mimosoidea), in Ecuadorian Amazonia María J. Endara, María J. Endara Departamento de Ciencias Biológicas, Herbario QCA, Pontificia Universidad Católica del Ecuador, Av. 12 de Octubre y Roca, Aptdo. 17-01-2184, Quito, Ecuador 1Corresponding author; current address: Department of Biology, University of Utah, Salt Lake City, UT 84112, U.S.A.; e-mail: [email protected]Search for more papers by this authorJaime L. Jaramillo, Jaime L. Jaramillo Departamento de Ciencias Biológicas, Herbario QCA, Pontificia Universidad Católica del Ecuador, Av. 12 de Octubre y Roca, Aptdo. 17-01-2184, Quito, EcuadorSearch for more papers by this author María J. Endara, María J. Endara Departamento de Ciencias Biológicas, Herbario QCA, Pontificia Universidad Católica del Ecuador, Av. 12 de Octubre y Roca, Aptdo. 17-01-2184, Quito, Ecuador 1Corresponding author; current address: Department of Biology, University of Utah, Salt Lake City, UT 84112, U.S.A.; e-mail: [email protected]Search for more papers by this authorJaime L. Jaramillo, Jaime L. Jaramillo Departamento de Ciencias Biológicas, Herbario QCA, Pontificia Universidad Católica del Ecuador, Av. 12 de Octubre y Roca, Aptdo. 17-01-2184, Quito, EcuadorSearch for more papers by this author First published: 01 March 2011 https://doi.org/10.1111/j.1744-7429.2010.00668.xCitations: 13 Read the full textAboutPDF ToolsExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL ABSTRACTen In tropical forests, much of the plant diversity is due to a large number of congeneric taxa. It is unclear what ecological processes are responsible for the number and composition of co-occurring species in these forests. Here, we present strong evidence that microhabitat heterogeneity may contribute to the coexistence of many different Inga species in just 100 ha. We examined their patterns of abundance and diversity in 75 transects related to the edaphic variables: soil water content, pH and soil texture at three different microtopographical units (ridges, slopes and valleys). We used two different approaches: Inga community level analyses and individual-species analyses. Multivariate analyses, controlled for spatial autocorrelation, demonstrated that species show a distributional gradient mainly related to soil water content and to a lesser degree pH. Individual-species analyses determined that obligate microhabitat restriction is uncommon: only 2 of 37 species analyzed were restricted to a single microhabitat. Habitat association analyses, however, identified a number of species characteristic of the ridge, slope and valley microhabitats. We conclude that the environmental setting plays an important role in the Inga community assembly but is not sufficient to explain the coexistence of 37 sympatric species at a single site. RESUMENes Gran parte de la diversidad de plantas en bosques tropicales corresponde a especies congenéricas. Es incierto cuáles procesos ecológicos son los responsables del número y composición de dichas especies. En este estudio presentamos evidencia de que la heterogeneidad de microhábitat podría permitir la coexistencia de varias especies del género Inga en 100 ha de bosque. Examinamos sus patrones de abundancia y diversidad en relación a los factores edáficos: contenido de agua, pH y textura del suelo en 75 transectas en tres diferentes unidades microtopográficas (crestas, pendientes y valles). Utilizamos dos enfoques diferentes: análisis a nivel de toda la comunidad del género Inga y análisis a nivel de cada especie. Análisis multivariados, controlando la autocorrelación espacial, demostraron que las especies presentan un gradiente distribucional principalmente relacionado al contenido de agua en el suelo y en menor grado al pH. Los análisis a nivel de cada especie determinaron que la restricción a un solo micro-hábitat es poco común: únicamente dos de las 37 especies analizadas estuvieron restringidas a un solo micro-hábitat. Sin embargo, análisis de asociación de hábitat identificaron varias especies características de los micro-hábitats cresta, pendiente y valle. Concluimos que los factores ambientales juegan un papel importante en el ensamblaje de la comunidad del género Inga pero no son suficientes para explicar la coexistencia de 37 especies simpátricas en un solo sitio. Citing Literature Supporting Information TABLE S1. Species of Inga, number of individuals (abundance) and the number of transects (of a total of 75) in which the species was present (frequency). Please note: Wiley-Blackwell is not responsible for the content or functionality of any supporting materials supplied by the authors. Any queries (other than missing material) should be directed to the corresponding author for the article. Filename Description BTP_668_sm_table-s1.doc87.5 KB Supporting info item Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article. Volume43, Issue2March 2011Pages 157-164 RelatedInformation