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Resumen del producto

Band Schmidt, C.J., L.J., Fernández-Herrera, D.V., Ramírez-Rodríguez, M.G., Zumaya-Higuera, F.E., Hernández-Sandoval, E.J., Nuñez-Vázquez, J.J., Bustillos-Guzmán, D.J., López-Cortés & I., Leyva-Valencia (2017). Effect of different taxonomic groups on the growth and toxin content in Gymnodinium catenatum cultures from the Pacific coast of Mexico. P., L. A. O. and Hallegraeff, G. (Eds.), International Society for the Study of Harmful Algae 2017 (Ed.), Marine and Fresh-Water Harmful Algae. Proceedings of the 17th International Conference on Harmful Algae. pp.54-57.

Effect of different taxonomic groups on the growth and toxin content in Gymnodinium catenatum cultures from the Pacific coast of Mexico

Christine Johanna Band Schmidt, Leyberth J. Fernández-Herrera, Dulce V. Ramírez-Rodríguez, Miriam G. Zumaya-Higuera, Francisco Eduardo Hernández-Sandoval, Erick J. Nuñez-Vázquez, Jose J. Bustillos-Guzmán, David Javier López-Cortés y Ignacio Leyva-Valencia

The effect of cells and cell-filtrates of microalgae belonging to different taxonomic groups were tested on thegrowth and toxin content of Gymnodinium catenatum cultures. Cultures of a raphidophyte (Chattonellamarina var. marina), a dinoflagellate (Margalefidinium polykrikoides), and a bacterial community isolatedfrom G. catenatum were used. All these were cultivated in GSe media, maintained at 24 ± 1°C, salinity 34,and a 12:12 light:dark cycle. Samples for cell counts and microscopic observations were taken. Chattonellacaused a strong and fast inhibition of G. catenatum growth; mortality of G. catenatum occurred with andwithout direct cell contact, indicating that toxic metabolites were released to the culture medium.Margalefidinium polykrikoides also caused mortality of G. catenatum but required a longer time. The growthresponse of G. catenatum towards the bacterial community was isolate-specific. Changes in of G. catenatummorphology, i.e. loss of flagella, swelling, evident nucleus and lysis, were observed in all cases, and cellsresembling pellicle cysts in some. The results suggest that biotic factors affect G. catenatum growth and lifehistory transitions, providing new insights on the interactions between G. catenatum and other co-occuringplanktonic species.

Palabras clave: biotic interactions; Growth; Gymnodinium catenatum; Morphology; paralytic shellfish toxins

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