Puntos y áreas flexibles (PAF) para inventarios rápidos del estado de biodiversidad
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Ecología en Bolivia
Abstract
El método de puntos y áreas flexibles de inventario rápido (PAF) combina los clásicos métodos de intercepción de puntos con áreas de muestreo o cuadrantes; registrando puntos a lo largo de una línea (el método de intercepción de puntos) pero incorporando además un área de uno a varios metros (cuadrante flexible) a cada lado para incluir las especies más raras en forma cuantitativa. Esta combinación resuelve la tensión que existe entre la objetividad de la evaluación de cobertura vs. inclusión de las especies más raras. En el PAF las áreas incluyen a las especies más raras de manera cuantitativa y relacionable con el área muestreada, pero con un mínimo de pisoteo a la vegetación y un mínimo de esfuerzo de muestreo. Esto permite análisis estadísticos más avanzados como obtención de curvas especie-área, derivación de curvas de rango-abundancia y los análisis respectivos, cálculo de índices como los de diversidad de Shannon-Weaver, equitatividad y ajuste lognormal (ΔL), entre otros.
The point and flexible area sampling method for rapid inventories of biodiversity status (PAF) combines classical methods of point intercepts with quadrat sampling areas. The method registers points along a line (point intercept method), and in addition samples an area of one to several meters (flexible quadrat) on each side of this line to provide a quantitative assessment of the rarer species. Such a combination resolves the tension between the objectivity of cover evaluation vs. the need to include rarer species. PAF areas include a quantitative assessment of species cover in relation to the total sample area, with minimum trampling and minimum sampling effort. This provides information suitable for more advanced statistical analyses such as obtaining species-area relationships, deriving rank-abundance curves and the corresponding analyses, and the calculation of indices such as the Shannon-Weaver diversity index, equitability, distance to the lognormal (ΔL), etc.
The point and flexible area sampling method for rapid inventories of biodiversity status (PAF) combines classical methods of point intercepts with quadrat sampling areas. The method registers points along a line (point intercept method), and in addition samples an area of one to several meters (flexible quadrat) on each side of this line to provide a quantitative assessment of the rarer species. Such a combination resolves the tension between the objectivity of cover evaluation vs. the need to include rarer species. PAF areas include a quantitative assessment of species cover in relation to the total sample area, with minimum trampling and minimum sampling effort. This provides information suitable for more advanced statistical analyses such as obtaining species-area relationships, deriving rank-abundance curves and the corresponding analyses, and the calculation of indices such as the Shannon-Weaver diversity index, equitability, distance to the lognormal (ΔL), etc.
Description
Vol. 46, No. 1