Resumen del producto

Microalgae blooms are frequent and periodic throughout the year in La Ensenada deLa Paz, a lagoon formed by a large sand bar enclosed at the southern end of the Bahía de LaPaz in the southwestern Gulf of California. Brown patches of the dinoflagellate Peridiniumquinquecorne Abé, an armored dinoflagellate that is cosmopolitan in neritic and estuarinewaters, were observed in July 2003 near a beach at the mouth of the lagoon. The patches wereabout 50-100 m long by 10-15 m wide and persisted for two days when water temperaturewas 26.2 to 27 °C. The blooms occurred after four days of a heavy rain. Abundance of P.quinquecorne varied from 3.4 to 6.4 × 106 cells l-1 and chlorophyll a varied from 13.20 to17.75 mg m-3. Concentrations of nutrients in this area were higher than normal, related to acontinuous re-suspension of sediment caused by wave action. The higher nutrient contentpromoted formation of patches of P. quinquecorne in this part of the lagoon.

Palabras clave: Specialist; canal artificial; microalgae bloom; Peridinium quinquecorne.

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