Resumen del producto

The Islands of the Gulf of California according to the World Wildlife Fund-Mexico Gulf of California Program assigns a hierarchical ranking higher (80%) of conservation priority due to anthropogenic threats, and therefore require an inventory and ecological assessment that allows ensure that future measures to be taken on the islands, are not affected by negative actions in the management of its coastal zone. We study the composition and community structure of sandy mollusc Cerralvo island and its relationship to the type of sediment. We selected 32 sampling sites where 64 samples were collected, of which 32 corresponded to 32 samples of sediment and biological samples (mollusks) obtained by scuba diving. Used as descriptors of the environment temperature, chlorophyll a (Sea WiFS), depth and sediment grain size. We analyzed the abundance and diversity of the benthic community Malacological as ecological indicators. There were 7326 specimens of 148 species of mollusks, the best represented family was Tellinidae with the most abundant species Tellina eburnea (50.7%), followed in importance Transennella humilis (9%), the bivalve Megapitaria squalida was the most widely distributed species in sampling sites. The greatest richness was found in shal­low bottoms of coarse sand between 2 and 30 m deep. The average values derived diversity index (1.9 bits / indiv.) Have proved to be minor compared to other places in different latitudes of the western coast of the Gulf of California.

Palabras clave: pepino de mar; Espíritu Santo; espectro trófico; sedimento

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