Resumen del producto

The chlorophyll (Chl) a and egg production of the copepods Acartia lilljeborgii Giesbrecht, 1889, Labidocera johnsoni Fleminger, 1964, and Centropages furcatus (Dana, 1849) were estimated daily between 11-15 October, and 22-26 November in Ensenada de la Paz, Baja California Sur, México. Temperature ranked 25.8 and 26.5°C in October 2010, and between 21.9-23°C.in November 2010. Chlorophyll a concentration in October was around 1. mg m-3, reducing in 50% in November indicating oligotrophic conditions with < 0.06 Chl a mg m–3. A. lilljeborgii had a higher egg production rate in October of 2010 compared to November 2010; remarkable variability within and between each day of October was observed. Mature females of L. johnsoni were found in a few days in October and the EPR in this month was slightly higher than in November. The variability was very high between days. C. furcatus had the highest EPR of all species, especially during November. Notable was the reduction of EPR of A. lilljeborgii and L. johnsoni in November, indicating a seasonal change in the reproduction strategy of this species. C. furcatus is a species that can produce eggs continuously at low concentrations of chlorophyll, what is certainly an important factor to keep it as one of the more abundant species in the study area.

Palabras clave: Acartia lilljeborgii; copépodos; Egg production; Labidocera johnsoni

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