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Resumen del producto
Aguillón Negreros, A., M.D., Herrero Perezrul & B.P., Ceballos Vázquez
(2011).
Spatio-temporal variation in the recruitment of Mollusks (Bivalvia and Gastropoda) on rocky shores in Bahía de la Paz, B.C.S. México.
44th Western Society of Malacologists Annual Meeting and 12th National Biennial Meeting of Malacology and Conchology of The Sociedad Mexicana de Malacología, A.C..
La Paz, Baja California Sur, México, México, junio 27 - 30, 2011,
161.
Spatio-temporal variation in the recruitment of Mollusks (Bivalvia and Gastropoda) on rocky shores in Bahía de la Paz, B.C.S. México
Alejandra Aguillón Negreros, María Dinorah Herrero Perezrul y Bertha Patricia Ceballos Vázquez
Rocky shores are considered environments with high species diversity, where organisms of almost all marine phyla are represented. Defined by the dominance of their invertebrate fauna, mollusks are part of the most common organisms distributed in these environments. Recruitment in this group plays an important role in shaping the structure of their communities, due to the fact that most of their species are sedentary in their adult life. The study of mollusk recruitment has centered on evaluating species of commercial interest, hence the important role of natural recruitment in these communities is unknown. We evaluated the spatial and temporal changes in the recruitment of mollusks bimonthly during an annual period from May 2009 to April 2010. Artificial collectors (N= 360) were deployed at three sites in the northern and southern shores of Bahía de La Paz, at El Portugués, El Corralito and El Pulguero. Variations in composition and abundance of recruited species were measured by ecological indices of diversity (Shannon-Wiener H’), richness (number of species S), evenness (Pielou J’) and dominance (I.V.I.) Environmental variables such as temperature, salinity, oxygen, suspended particulate matter (SPM) and chlorophyll a were evaluated. A total of 3,293 recruits where collected during the sampling period, belonging to 60 species, 52 genera, 38 families, 11 orders and 3 classes of Mollusca. Significant differences (P<0.05) were only found between the values of species richness. Seasonal differences were observed in changes of the species composition and in the variation in the abundance of dominant species. Seasonality was reflected principally in the temperature, with a maximum of 30º C in May-June 2009 (hot season) and a minimum of 20º C in November-December, and in the chlorophyll a, with a maximum of 4.2 mg m-3 (November-December) and a minimum of 1.86 mg m-3 (May-June).
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