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Título : | Factors affecting woody plant species diversity of fragmented seasonally dry oak forest in the Mixteca Alta, Oaxaca, Mexico |
Otros títulos : | Factores que afectan la diversidad de especies leñosas en fragmentos de bosques de encino estacionalmente seco en la Mixteca alta oaxaqueña, México |
Autor : | Aguilar-Santelises, Remedios del Castillo, Rafael F. |
Palabras clave : | fragmentation sesasonally dry oak forest human dusturbance species-area retion ship topographic heterogeneity structural equation modeling |
Fecha de publicación : | jun-2013 |
Editorial : | Revista Mexicana de Biodiversidad |
Citación : | Volumen 84 |
Citación : | volumen 84; ;2 |
Resumen : | Abstract. We explored the relationship between fragment area, topographic heterogeneity, and disturbance intensity with tree and shrub species diversity in seasonally dry oak forest remnants in the Mixteca Alta, Oaxaca, Mexico. The fragments are distributed in a matrix of eroded lands and crop fields, have a complex topography, and are disturbed by plant extraction and trail opening. Sampling was conducted in 12 fragments from 12-3 211 ha. Topographic heterogeneity was estimated by the fragment’s standard deviation in slope-aspect, slope, and altitude. The density of stumps and roads were used as estimators of disturbance intensity. Fisher’s α diversity ranked from 0.95 to 4.55 for the tree layer; and 2.99 to 8.51, for the shrub layer. A structural equation model showed that the diversity of woody plants increases with topographic heterogeneity and disturbance in the remnants. When these 2 variables were considered, diversity tended to decrease with fragment size probably because smaller fragments have a greater perimeter-to-area ratio and therefore proportionally offer more opportunities for pioneer species colonization. Indeed, the tree-to shrublayer diversity ratio increased with fragment size. Conservation strategies in fragmented forests must consider the fragment´s environmental heterogeneity, the disturbance type and intensity, and the species to be preserved. |
URI : | http://www.repositoriodigital.ipn.mx/handle/123456789/18925 |
ISSN : | 1870-3453 |
Aparece en las colecciones: | Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
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Factors affecting woody plant species diversity Resumen.pdf | 177.02 kB | Adobe PDF | Visualizar/Abrir |
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