Riqueza, composición y diversidad de la comunidad de moluscos asociada al sustrato rocoso intermareal de playa Parque de la Reina, Acapulco, México

Abstract

The information available about marine biodiversity in the State of Guerrero, Mexico, is scarce as designated by the National Commission for the Conservation and Use of Biodiversity. To gain on this issue, this work was carried on at the rocky intertidal zone of Parque de la Reina beach, Acapulco, which is located in the Priority Region for Marine Conservation and Biodiversity Use Number 32. The objective was to establish the mollusks species richness, community structure, determine the density and degree of species occurrence, composition by size and diversity. The sampling area was 10 m-2 and the sampling unit was 1 m-2. Fifty eight species were identified, with 4 new records for the intertidal rocky shores of Acapulco. The best represented families were: Muricidae, Ischnochitonidae, and Mytilidae. The observed density was of 207.55 m-2. Twenty one species were rated as dominant. Macrocypraea cervinetta had the highest size. The mollusks richness was high, as is expected in the tropics. The constant and dominant species accounted for 55.16% of the total, and considered as representative of the community. The density found was higher than has been previously reported for the State of Guerrero; the type of substrate is one of the determining factors defining species richness and abundance