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Temperature and nutrient concentrations were measured during a mixed bloom of Noctiluca scintillans and Gymnodinium catenatum in La Paz Bay, Gulf of California. Under laboratory conditions, we offered three concentrations of G. catenatum (312, 625, or 1015 cells mL–1) to 0.53 N. scintillans cells mL–1 to study predation rates. Experiments were carried out with 750 mL of culture during a fiveday period. Sea surface temperature clearly showed a transitional period from colder to warmer water during the bloom. Field and laboratory data showed that N. scintillans fed on G. catenatum. During the trial, more than 70% of N. scintillans cells contained G. catenatum cells in their vacuoles. Ingestion rates varied; the highest ranged from 30 to 40 G. catenatum cells h–1 in each N. scintillans cell. A clear relation to the concentration of the diet was not evident. Low values of 1 to 3 G. catenatum cells h–1 in each N. scintillans cell were typical at the end of the trial. Noctiluca scintillans doubled in concentration about every 48 h; however, numerous trophonts were observed leaving the cytoplasmic membrane, suggesting cell damage. These data indicate that N. scintillans ingests G. catenatum cells but the prey appears to damage predator cells in a relatively short time.   Se monitoreo la temperatura y los nutrientes durante una proliferacion de Noctiluca scintillans y Gymnodinium catenatum en la bahia de La Paz, golfo de California. Tambien, bajo condiciones de laboratorio, se mezclaron diferentes concentraciones de G. catenatum (312, 625, o 1015 celulas mL–1) con 0.53 celulas de N. scintillans mL–1 a fin de evaluar las tasas de pastoreo. La experimentacion se llevo a cabo en 750 mL de cultivo durante un periodo de cinco dias. La temperatura superficial mostro claramente un periodo de transicion de agua fria a caliente durante la proliferacion. Las observaciones de campo y las de laboratorio mostraron que N. scintillans se alimentaba de G. catenatum. En el laboratorio, mas del 70% de N. scintillans contenia celulas de G. catenatum en sus vacuolas. La tasas de ingestion variaron ampliamente; los valores mas altos variaron de 30 a 40 celulas de G. catenatum h–1 en cada celula de N. scintillans. No se observo una relacion entre las diferentes concentraciones de G. catenatum ofrecidas y la tasa de ingestion. Al final del experimento se observaron tasas de ingestion bajas de 1 a 3 celulas de G. catenatum h–1 en cada celula de N. scintillans. La concentracion de N. scintillans se duplico aproximadamente cada 48 h; sin embargo, observamos numerosos trofontes saliendo de su cubierta externa, lo cual sugiere que existio dano celular. Estos datos indican que N. scintillans ingiere a G. catenatum pero la presa parece danar al depredador en un corto plazo.

ciencias marinas

Grazing of the dinoflagellate Noctiluca scintillans on the paralytic toxin-producing dinoflagellate Gymnodinium catenatum: Does grazing eliminate cells during a bloom?