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Egg Production and Fecundity Changes during the Year in the Fine-Sediment Amphipod, Ampelisca araucana Gallardo, 1962

Edgardo Soto, Enrique Bay-Schmith and Alberto Larrain
Crustaceana
Vol. 79, No. 4 (Apr., 2006), pp. 385-395
Published by: Brill
Stable URL: http://www.jstor.org/stable/20107667
Page Count: 11
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Egg Production and Fecundity Changes during the Year in the Fine-Sediment Amphipod, Ampelisca araucana Gallardo, 1962
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Abstract

Seasonal changes in reproductive parameters like number and size of ovigerous females and number and size of eggs were studied throughout the year in an amphipod living in a stable environment. Specimens of Ampelisca araucana were collected from samples of fine sediments obtained at Coliumo Bay, Chile (36°31′S 72°55′W) between October 1995 and October 1996. Monthly measurements show changes throughout the year in the size of the ovigerous females and their eggs, as well as in their abundance. Batch size as well as egg size, however, are not directly related to female size. The changes observed in the reproductive parameters seem to be related to various physico-chemical properties of the water, and to the availability of food. /// Se estudiaron cambios estacionales en los parámetros reproductivos número y tamaño de hembras ovígeras, número y tamaño de huevos a través del año en el anfípodo de ambiente estable Ampelisca araucana. Los ejemplares fueron recolectados de muestras de sedimento fangoso obtenidas en la Bahía de Coliumo (36°31′S 72°55′W) entre Octubre 1995 y Octubre 1996. De acuerdo a los resultados, existen cambios en el tamaño de huevos y hembras ovígeras como también en el número de ellos a través del año. Sin embargo el número y tamaño de los huevos no se encuentra en relación lineal al tamaño de las hembras. Los cambios observados en los parámetros reproductivos parecen estar vinculados con parámetros físico-químicos como también por la disponibilidad de alimento.

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