
handle: 10201/131887
Comparison of two methods to estimate the population density of Ocypode gaudichaudii The study compares two methods (i.e., quadrants and distances) for estimation of population density in O. gaudichaudii. On the beach “Los Ranchos”, 13 transects were established and eight in “Las Bocas”; in addition, a visual census was carried out on each beach. In the analyses Los Ranchos was considered as an area and as two subdivisions (Los Ranchos-1, 2). The results showed that, the sampling by quadrants was more precise in Los Ranchos2 (6% of bias) and Las Bocas (4% of bias) while, the distance sampling was more accurate in Los Ranchos beach (32% of bias) and Los Ranchos-1 (29% of bias). In beaches with high densities (> 0,5 ind./m2 ) the method by quadrants should be selected and on beaches with low densities (< 0,5 ind./m2 ) the method by distances is recommended.
El estudio compara dos métodos de estimación (i.e., cuadrantes y distancias) de densidad poblacional, en O. gaudichaudii. Se establecieron 13 transectos en la playa “Los Ranchos” y ocho en “Las Bocas”; además, se realizó un censo visual en cada playa. Los análisis se desarrollaron considerando a Los Ranchos como un área y como dos subdivisiones (Los Ranchos-1, 2). Los resultados mostraron que, el muestreo por cuadrantes fue más preciso, en Los Ranchos-2 (6% de sesgo) y Las Bocas (4% de sesgo) mientras que, el muestreo por distancias fue más preciso en la playa Los Ranchos (32% de sesgo) y Los Ranchos-1 (29% de sesgo). En playas con altas densidades (> 0,5 ind./m2 ) se debe seleccionar el método por cuadrantes y en playas con bajas densidades (< 0,5 ind./m2 ) se recomienda el método por distancias.
Quadrant sampling, Cangrejo fantasma, Censo visual, Ecuador, Ghost crabs, Muestreo por cuadrantes, CDU::5 - Ciencias puras y naturales::57 - Biología, Manabí, Muestreo por distancias, Distance sampling, Visual census
Quadrant sampling, Cangrejo fantasma, Censo visual, Ecuador, Ghost crabs, Muestreo por cuadrantes, CDU::5 - Ciencias puras y naturales::57 - Biología, Manabí, Muestreo por distancias, Distance sampling, Visual census
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