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Resumen del producto

Verdugo Díaz, G., A., Martinez Lopez & I., Gárate Lizárraga (2011). Phytoplankton community structure in Bahía Concepcion, Gulf of California. 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, 73.

Phytoplankton community structure in Bahía Concepcion, Gulf of California

Gerardo Verdugo Díaz, Aida Martinez Lopez y Ismael Gárate Lizárraga

Bahía Concepción is an area with a high production of bivalve mollusks. The scallop Argopecten ventricosus is one of the most important fishery resources in the area. The objective of the present study is to describe the spatial variability of phytoplankton and the particles that may potentially serve as food for this species during the spawning season. Seasonal changes in the spatial distribution of the phytoplankton community were determined in Bahía Concepción, B.C.S., from 1991 to 1993. The total abundance, and the seasonal variation of phytoplankton size fractions (nanno- and microphytoplankton) were determined as well as its structure. A total of 230 taxa were identified. Diatoms were the best represented group due to the highest species richness (131). The most important genera were Chaetoceros, Rhizosolenia and Nitzschia. The second important group were dinoflagellates (92 species), represented mainly by Protoperidinium, Ceratium and Prorocentrum. The third most numerically important group were the silicoflagellates (9 species). The most representative genus of this group was Dictyocha. A major presence of the diatoms was observed during the cold months with a homogeneous water-column. Dinoflagellates registered the major presence in the warm season when the water-column is stratified. About 10 species of dinoflagellates were identified and they are considered toxic or potentially toxic. It is notable that detritus represented the main source of particles for these organisms in the sampling level nearest the bottom. Another possible supplement in their nutrition is the tychoplankton flora found at some stations of the bay, in particular the genera of diatoms such as Melosira, Licmophora, Pleurosigma and Navicula. They occurred in the stomach content of several pectinid species.

Palabras clave: microfitoplancton; Espíritu Santo; Argopecten ventricosus; nanofitoplancton. Diatomeas

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