Resumen del producto

The Class Ophiuroidea is perhaps one of the less known in México, possibly due to their cryptic habits, which difficults their study. The objective of this work was to analyze some ecological traits of the Ophiuroidea in Acapulco, Guerrero, México, such as abundance, species richness, and taxonomic diversity in five rocky sites during April and May 2014. A total of six quadrats (50 cm²) separated 3 m from each other were done on each site, at a maximum depth of 10.6 m. A total of 1,174 individuals were collected, with 11 species distributed in only one Order, five Families, and eight Genera. The species Ophiactis savignyi, Ophiocoma aethiops and Ophiocoma alexandri were the most abundant, and all sites had between 6 and 7 species and only Playa Tlacopanocha recorded the highest value found of 11 ophiuroids. This site is the most impacted by human activities and there is all type of debris in the bottom, which we think, act as a kind of an artificial reef, providing with different substrata for the animals to live on. Diversity was high (H´= 2.22 bits/ind), and the taxonomic indices presented values below the taxonomic level of genus (50), while average values of taxonomic distinctiveness of both abundance and presence/absence showed values close to the taxonomic level of family values (75). The results suggest a high diversity, so that in Acapulco, the class Ophiuroidea is taxonomically more distinct.

Palabras clave: diversity; dominant species.; Community structure; quadrats

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