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Mangrove ecosystems are critical habitat for many species. The productivity of mangroves is important due its contribution in form of organic detritus and secondary production. The objective was to identify indicators of secondary productivity of mangrove systems to establish a baseline for measuring changes in the mangrove system due potential natural or anthropogenic disturbances. The bivalve mollusks, the mangrove cockle Anadara tuberculosa and the mangrove oyster Saccostrea palmula were chosen as indicators of secondary productivity. Samples were collected in three mangroves of the sand barrier El Mogote in the Ensenada de La Paz, from August 2007 to July 2009. Abundance and secondary production were estimated based on biomass increase. The estimated weight increase was performed by determining individual growth rates through an analysis of length frequency distributions. The average abundance was 1.27 and 510 ind m^-2 of mangrove cockle and mangrove oyster respectively. It was estimated a growth rate of 4.91 mm?month ^-1 (3.67 g?month^-1) for mangrove cockle and 3.80 mm?month^-1 (0.18 g?month^-1) for the mangrove oyster. Average secondary production of mangrove cockle was 4.51 g/m2 month and was higher during the spring, while for the mangrove oyster was 97.9 g m^-2 month^-1, and the maximum production was recorded during the summer. Crustaceans are at greatest abundance, distribution and species richness, as species of crabs (Brachyura and Anomura), the rest barnacles, amphipods and caridean shrimps. The estimated wet weight biomass throughout the year in the mangroves, varied considerably from 62.8 kg m^-2 in August to 9.6 kg m-2 in April, while the others showed less variation, with maximum registered in February to 19.9 kg m^-2 and 1.3 kg m^-2 minimum in September; but, it was not possible estimated the productivity based on biomass increase. The obtained results as a quality index of benthos are suitable for measuring changes to the mangrove system in the Ensenada of La Paz, Baja California Sur, México.

Palabras clave: Crustaceans; El Mogote.; secondary productivity; mangrove; mollusks

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