Resumen del producto

To identify spatiotemporal variation patterns in the structure of the rocky and sandy, shallow bottom macroinvertebrate community, two surveys (November 2011 and March 2012) were conducted at five sites around the Espíritu Santo Archipelago, Baja California Sur, Mexico. The abundance of conspicuous macrobenthos (gastropods, bivalves and cephalopods) was estimated visually by free diving at 4-6 m in depth along two band-transects parallel to the coastline. Each transect was 5 m wide and 50 m long, covering an area of 500 m² per site. Sea surface temperature, wave exposure, type of substrate and slope were also recorded. Seventeen species were identified. The bivalves were the best represented group, with 9 species from 7 families, followed by the gastropods, with 7 species from 4 families, and one cephalopod. The highest mean abundance and density values were recorded for Pinctada mazatlanica (25.4 ± 16.7 ind and 0.05 ind m², respectively), Pinna rugosa (3.0± 3.08 ind and 0.008 ind m², respectively) and Muricanthus nigritus (2.6± 4.3 ind and 0.005 ind m², respectively). There were no significant differences in diversity, equitability and species richness among sampling months, though differences were found among sites (P < 0.05). A spatial diversity pattern was identified, with low values (Shannon H' = 0.42 bits ind^-1 y J = 0.30) for exposed shores and high values (H' = 2.06 bits ind^-1 y J = 0.86) for semi-sheltered areas.

Palabras clave: Structure; Espíritu Santo Archipelago; macroinvertebrate community

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