Seasonal turnover in floristic composition of flooding savannas in Arauca, Colombia ; Variación estacional de la composición florística en sabanas inundables en Arauca, Colombia
Changes in the floristic composition in flooded savannas in Arauca (Arauca, Colombia) were described and correlated with annual rain patterns. We surveyed the vegetation to determine species richness, relative abundances and the Importance Value Index (IVI) using eleven-point line transects and eleven 1 m2 plots every two months for a year. 110 species were recorded, and there was a positive correlation between the monthly precipitation and the abundance of individuals in the vegetation community. The higher values of species richness (96) occurred during the wet season compared to the dry sea... Mehr ...
| Verfasser: | |
|---|---|
| Dokumenttyp: | Artikel |
| Erscheinungsdatum: | 2019 |
| Verlag/Hrsg.: |
Universidad Nacional de Colombia - Sede Bogotá - Facultad de Ciencias - Instituto de Ciencias Naturales
|
| Schlagwörter: | Botany / Llanos Orientales / Orinoquia / seasonality / vegetation / plant ecology / Botánica / régimen climático / vegetación / ecología vegetal |
| Sprache: | Spanish |
| Permalink: | https://search.fid-benelux.de/Record/base-27653269 |
| Datenquelle: | BASE; Originalkatalog |
| Powered By: | BASE |
| Link(s) : | https://revistas.unal.edu.co/index.php/cal/article/view/70467 |
Changes in the floristic composition in flooded savannas in Arauca (Arauca, Colombia) were described and correlated with annual rain patterns. We surveyed the vegetation to determine species richness, relative abundances and the Importance Value Index (IVI) using eleven-point line transects and eleven 1 m2 plots every two months for a year. 110 species were recorded, and there was a positive correlation between the monthly precipitation and the abundance of individuals in the vegetation community. The higher values of species richness (96) occurred during the wet season compared to the dry season species richness (57). Also, the wet season rank abundance curve had higher evenness compared to the dry season curve. Species that were dominant during the dry season included Hydrolea spinosa, Melochia spicata, Peltaea sessiliflora, Cyperus luzulae, Acroceras zizanioides, and Andropogon bicornis. 53 species were exclusive to the wet season and fourteen to the dry season. This study shows the high botanic biodiversity that can be found in the Orinoco savannas. ; Mediante censos se documentó el recambio en la composición florística asociado al régimen de lluvias en comunidades de las sabanas de Arauca (Arauca, Colombia). Además, se cuantificó la abundancia relativa y el Índice de Valor de Importancia (IVI) de las especies en eventos de muestreo bimestrales a lo largo de un año. Se usaron transectos lineales con once puntos y once cuadrantes de 1 m2. Se registraron 110 especies y se obtuvo una correlación positiva entre la precipitación mensual y la abundancia de individuos, acompañada de un aumento del 85,7 % en la riqueza de especies en los meses de lluvias. Debido al mayor número de especies (96) la equitatividad de la comunidad fue mayor en el periodo de lluvias en tanto que, de las 57 especies de la época de sequía hubo dominancia de especies como Hydrolea spinosa, Melochia spicata, Peltaea sessiliflora, Cyperus luzulae, Acroceras zizanioides y Andropogon bicornis. El periodo de lluvias tuvo 53 especies exclusivas ...