Reproducción de la Garza Gandera (<em>Bubulcus ibis</em>) en la Ciénaga de Biramas, Cuba

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Dennis Denis
Antonio Rodríguez
Patricia Rodríguez
Ariam Jiménez

Resumen: La Garza Ganadera (Bubulcus ibis) es una especie de particular interés por su asociacin a agroecosistemas que la hace potencialmente importante como controlador biolgico. El presente trabajo brinda algunos de sus parámetros reproductivos en la ciénaga de Biramas, Granma, Cuba, durante la estacin de cra de 1999. Se localizaron y marcaron 176 nidos de esta especie en la colonia de Cayo Norte, los cuales fueron medidos y visitados diariamente durante dos semanas para evaluar la mortalidad y el éxito reproductivo. Los nidos se ubicaron a 1.4 – 0.3 m de altura y tuvieron un diámetro de 28.6 – 5.4 cm. El tamaño de la nidada fue de 2.08 huevos, cuyo diámetro mayor fue de 45.73 – 2.4 mm y diámetro menor de 32.13 – 1.6 mm. No se detectaron diferencias estadsticas entre los huevos en relacin con el orden de puesta. El intervalo entre puestas fue de 1.8 das, siendo la eclosin simultánea o en das consecutivos en el 36.8% de los casos. El 95% de los nidos perdi algœn huevo durante la incubacin y el 12% fue totalmente destruido antes de eclosionar, obteniéndose una probabilidad del 24.4% de que un nido iniciado llegue a producir al menos un pichn de 14 das de edad. El efecto del disturbio se expres en una disminucin de un 8.9% en la probabilidad de éxito de los nidos, pero la diferencia no present significacin estadstica. Tanto el peso corporal como el tarso y la longitud del pico siguieron un comportamiento sigmoideo, caracterizado por una ecuacin polinomial de tercer orden, además se brindan las regresiones lineales para predecir la edad de los pichones. 


Palabras clave: Bubulcus ibis, colonias, Garza Ganadera, reproducción


Abstract: The Cattle Egret (Bubulcus ibis) is an interesting species because it associates with agroecosystems, giving them potential value as biological controllers of pests. Here we report some reproductive parameters of the egret in the Ciénaga de Biramas, Granma province, Cuba, during the breeding season of 1999. A total of 176 nests was located and labeled in the Cayo Norte colony. The nests were measured and monitored for two weeks to determine mortality and reproductive success. Nests were at a mean height of 1.4 – 0.3 m and averaged 28.6 – 5.4 cm in diameter. Clutch size averaged 2.08 eggs, with eggs averaging 45.73 – 2.4 mm by 32.13 – 1.6 mm. No statistical differences were found between eggs in relation to laying order. Time between laying of sequential eggs was 1.8 days, with 36.8% being laid on the same day or the next day. Ninety-five percent of nests lost some egg during incubation and 12% of nests were destroyed before hatching, resulting in a probability of 24.4% that an initiated nest produce at least one nestling of 14 days old. Researcher disturbance was responsible for an 8.9% reduction in the probability of nest success, but this was not statistically significant. Weight and lengths of tarsus and bill exhibited sigmoidal growth curves best described by a third-order polynomial equation, which we present along with the lineal regressions. 

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