Resumen del producto

Quantification of photosynthetic efficiency and productive capacity of the phytoplankton community was the objective of the surveys that were conducted in December 2005, May and August 2006; and February, May and November 2007 in Bahía de La Paz (Cuenca Alfonso). Samples of water were collected from 7 levels of surface irradiance (100, 55, 33, 10, 3, 1 and 0.1%), of the euphotic zone (Zeu). In situ primary production estimations were performed by 14C assimilation methodology. There were 2 basic assimilation ratios patterns; one with subsurface maxima during February and May 2007 and other with a tendency of increasing values as the lower limit of the Zeu was approached (December 2005; May and August 2006; November 2007). Minimum values were observed in December with a range of 0.16 to 2.35 mg C (mg Chla)-1 h-1. February 2007 showed high variability with a range of 3.3 to 22.4 mg C (mg Chla)-1 h-1. During December 2005, May, August 2006 and November 2007, there was an increase to 0.1% of surface irradiance, which reached 10.22 mg C (mg Chla)-1 h-1 in August 2006. In May 2007, the maximum value (13.23 mg C (mg Chla)-1 h-1 was associated with the mixing layer. Depth integrated primary production (PP) value up to 350 g C m-2 year-1 point out the high productive feature of the study site in Bahía de La Paz. A significant increase in the PP to consider 0.1% of the surface irradiance as the lower limit euphotic observed.

Palabras clave: primary production; Photosynthetic efficiency; assimilation ratio; euphotic zone

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