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Hernández Sandoval, F.E., J., Bustillos Guzmán, D., López-Cortés, C.J., Band Schmidt, C.J., Núñez Vázquez & I., Gárate Lizárraga (2008). Effects of nutrients and ratios on abundance of Gymnodinium catenatum in two bays in the southern part of the Gulf of California, Mexico. 13th International Conference on Harmful Algae. Hong Kong, China, China, noviembre 3 - 7, 2008, 48.

Effects of nutrients and ratios on abundance of Gymnodinium catenatum in two bays in the southern part of the Gulf of California, Mexico

Fernando E. Hernández Sandoval, J. Bustillos Guzmán, David López-Cortés, Christine Johanna Band Schmidt, C.J. Núñez Vázquez y Ismael Gárate Lizárraga

Gymnodinium catenatum, a producer of paralytic shellfish toxin, is very common along the Mexican Pacific coast of Mexico and has been linked to human poisoning from eating contaminated shellfish. This study evaluates the relationship of nitrogen and phosphorus sources, as well as the N:P ratio, on abundance and toxicity of this dinoflagellate. Monthly samplings were collected in Bahía de Mazatlán (BAMAZ) and Bahía de La Paz (BAPAZ) from June 2006 through May 2007. Low densities of G. catenatum in both bays were found during the sampling period (1000 and 3000 cells/L, respectively). Detection of toxins in this phytoplankton was not possible at these low densities. N and P concentrations in BAPAZ were low (average 2.0 and 0.5 ?M, respectively). In BAMAZ, the average concentrations of were 5.0 for N and 1.5 ?M, respectively. N:P ratios between 2 and 5, and temperature ranging from 20 to 27 ?C in both bays coincided with the presence of G. catenatum. The low N:P ratios, as well as the absence of a stratified water column during the sampling period, were not optimal for blooms of G. catenatum.

Palabras clave: nutrients; Bahía de Acapulco

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