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espanolSe estudio la demografia de Anolis aquaticus (Taylor 1956), de la quebrada La Palma de Puriscal, Costa Rica (9o45’N, 84o27’O). Metodos de muestreos sistematicos mensuales en captura, marcacion, recaptura, registros de depredacion y reclutamiento fueron desarrollados para la estimacion poblacional. Se muestra distribucion en el lugar de estudio y en todo Costa Rica. La abundancia de machos, hembras y juveniles, es estacional, es mayor en la estacion seca. La proporcion de sexo en la poblacion es 1:1 y se reproducen todo el ano. El tamano poblacional fluctuo entre 86 a 575 individuos por mes. En el area de 2800 m2 , se estimo una densidad entre 307 a 2053 anoles, equivalente a 11-73 individuos en cada 100 m2 ; y en el area de 5684 m2 , se estimo una densidad entre 149 a 1008 individuos; correspondiente a 3-18 anoles en cada 100 m2 , durante los meses del ano. La estructura de la poblacion es similar en machos y hembras y presenta mayor numero de individuos en las categorias de tamano grande y baja cantidad en los tamanos juveniles. Se observaron a tres especies depredando a los A. aquaticus, una de cangrejo y dos de serpientes. El reclutamiento anual es del 25-37%. Los machos son reclutados en numeros mas altos y sobreviven mas que las hembras. EnglishThe demography of Anolis aquaticus (Taylor 1956) was studied at La Palma Canyon of Puriscal (9o45’N, 84o27’W). A methodology based on marking, capture, recapture, predation, and recruitment was used in order to determine the population. A distribution of anoles is shown throughout the study area and the country of Costa Rica. The abundance of males, females, and juveniles is greater in the dry season. The sex ratio in the population is 1:1 and they mate throughout the year. Population abundance varies between 86-575 individuals per month. In a 2800 m2 area, a density of 307 to 2053 anoles was estimated, which is equivalent to 11-73 individuals for each 100 m2. In a 5684 m2 area, a density was estimated of 149 to 1008 individuals, corresponding to 3-18 anoles for each 100 m2 during the months of the year. The population structure is similar in males and females, and it presents a greater number of individuals in adults and a low quantity of juveniles. Three species were observed as predating A. aquaticus: one crab species and two snakes. The annual recruitment rate was 25-37%. Males are recruited in larger amounts and they have higher survival probabilities than females.

Demografía de la población de Anolis aquaticus (Sauria Polychrotidae) de la quebrada La Palma, Puriscal, Costa Rica