Diversity, stability and landscape dynamics in savanna communities ; Diversidad, estabilidad y dinámica del paisaje en comunidades de sabana
At a border of a savanna plateau (Mesa de Guanipa, Venezuela) we sampled tree communities from different land forms to study relationships between species richness (S), diversity (H’) and compositional stability estimated with two indices: resistance to species turnover (Rst) and resistance to compositional change (Rc). The hypothesis is that in dynamic systems external factors such as substrate dynamics and tendency to disturbance are determinants of community diversity and stability. The five land forms found in the study area represent a temporal sequence starting in the Mesa and ending in... Mehr ...
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Dokumenttyp: | Artikel |
Erscheinungsdatum: | 2018 |
Verlag/Hrsg.: |
Sociedad Venezolana de Ecología
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Schlagwörter: | Deomorphology / Diversity / Disturbanc / Landscape dynamics / Seasonal savanna / Stability / Trees / Árboles / Diversidad / Disturbio / Estabilidad / Evolución del paisaje / Geomorfología / Sabanas estacionales |
Sprache: | Spanish |
Permalink: | https://search.fid-benelux.de/Record/base-26875019 |
Datenquelle: | BASE; Originalkatalog |
Powered By: | BASE |
Link(s) : | http://erevistas.saber.ula.ve/index.php/ecotropicos/article/view/10195 |
At a border of a savanna plateau (Mesa de Guanipa, Venezuela) we sampled tree communities from different land forms to study relationships between species richness (S), diversity (H’) and compositional stability estimated with two indices: resistance to species turnover (Rst) and resistance to compositional change (Rc). The hypothesis is that in dynamic systems external factors such as substrate dynamics and tendency to disturbance are determinants of community diversity and stability. The five land forms found in the study area represent a temporal sequence starting in the Mesa and ending in Coluvial Valleys, with the other as intermediate land forms. Whereas diversity was higher in the transitional land forms, there was no relationship between those parameters and compositional stability (Rst or Rc). These were lower between transitional land forms and Coluvial Valleys, where changes in composition are more important. These results add evidences of the role of external factors on the diversity and stability of plant communities. ; En los bordes de la Mesa de Guanipa (Venezuela) muestreamos comunidades arbóreas en distintas formas de relieve con el objetivo de estudiar las relaciones entre riqueza de especies (S) y diversidad (H’) con la estabilidad de la composición florística de esas comunidades, estimada con dos índices: Resistencia al Reemplazo de Especies (Rst) y Resistencia al Cambio en Composición (Rc). La hipótesis es que en sistemas sometidos a procesos dinámicos de transformación, factores externos a la comunidad vegetal tales como dinámica del sustrato y tendencia al disturbio son determinantes tanto de la diversidad como de la estabilidad de las comunidades. Las cinco formas de relieve del área de estudio representan una secuencia temporal que se inicia con la Mesa y termina con Valles Coluviales, siendo las otras tres formas intermedias y de mayor tendencia al disturbio. Mientras que la diversidad fue más alta en las formas intermedias, no encontramos correlación significativa entre H’ o S y la ...