Resumen del producto

Anadara tuberculosa (Sowerby 1833) (Bivalvia: Arcidae) dominates muddy mangrove communities of the lagoon of Ensenada de La Paz. 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 population biology of this intertidal ark was studied by determining population structure, growth and production at the three locations sandy barrier El Mogote from August 2007 to July 2009. Von Bertalanffy growth function was estimated through length-based methods (ELEFAN I and Battacharya; by software Fisat II) and using an asymptotic length (L_¥) of 93.2 mm and the growth constant (K) of 0.56 y^-1. Longevity is estimated to be approximately seven years. 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 org./m² of arks and It was estimated a growth rate of 4.91 mm/month (3.67 g/month). Average secondary production of the black ark was 4.51 g/m² month and was higher during the spring. The obtained results as a quality index of benthos are suitable for measuring changes to the mangrove system in the lagoon Ensenada de La Paz. However, the variability of the biomass of the black ark seems to be principally related to human activities.

Palabras clave: black ark; Anadara tuberculosa; Mangroves; secondary productivity

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