Resumen del producto

The composition and structure of the soft bottoms mollusks community of Santa Cruz Island (25 ° 18'N 110 ° 45'W and) was analyzed. On summer of 2010 32 samples were collected; 16 correspond to biological samples and 16 to sediments. The composition, abundance and diversity of the benthic malacological community were analyzed as ecological indicators. A total of 695 individuals were recorded, they were grouped in 2 class; Gasteropoda with 446 organisms (5 orders, 11 families and 19 species), the most abundant species was Siphonaria maura (18%), the class Bivalvia with 249 organisms (8 orders, 14 families and 25 species), the most abundant species for this class was Tellina eburnea (10%). The class Gastropoda represented higher abundances than Bivalvia with 64.17% and 35% respectively. The species with major abundances and relative frequencies were the gasteropods Siphonarua maura and the bivalve Septifer seteki. Four trophic categories were identified, filterers were the most abundant group (73%), followed by the herbivores (20%), carnivores (5%) and ectoparasites were the rarest group (2%). In this site the specific richness (44 taxa) were lower compared to other sites from different latitudes of the western Gulf of California possibly due to that the study site is a high energy environment were only juvenile mollusks and micromollusks were found.

Palabras clave: sediments; Communities; Gulf of California; mollusks; islands

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