Does the red tide-forming dinoflagellate<i>noctiluca scintillans</i>feed on bacteria?

Kirchner, Miranda; Sahling, G.; Uhlig, G.; Gunkel, Wilfried; Klings, Karl-Walter

doi:10.1080/00364827.1996.10413610

Cited by 61 publications

(26 citation statements)

References 18 publications

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“…26 o C in summer, since Noctiluca has been known to feed on a variety of prey items, including phytoplankton, bacteria, micro-and mesozooplankton, fish eggs and detritus (e.g. Kirchner et al 1996, Shanks & Walters 1996, Sautour et al 2000, Fonda Umani et al 2004). …”

Section: Seasonal Variations In Abundancementioning

confidence: 99%

Seasonal variability of the red tide-forming heterotrophic dinoflagellate Noctiluca scintillans in the neritic area of Sagami Bay, Japan: its role in the nutrient-environment and aquatic ecosystem

Ara

Nakamura

Takahashi

et al. 2013

Plankton Benthos Res

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Abstract:The role of the heterotrophic dinoflagellate Noctiluca scintillans in affecting the nutrient-environment and aquatic ecosystem was investigated in the neritic area of Sagami Bay, Kanagawa, Japan, from January 2002 to December 2006, based on abundance, intracellular nutrient content, excretion rate and response of phytoplankton (diatoms) to enrichment of nutrients extracted from N. scintillans cells. Seasonal variations in abundance and vertical distribution of N. scintillans were significantly related to the physical structure of the water column, water temperature, chlorophyll a and primary productivity. Intracellular nutrient contents, except for Si(OH) 4 -Si, revealed clear seasonal fluctuations, which were significantly correlated to cell size variations. Thalassiosira rotula increased to higher cell abundances at higher concentrations of nutrients, which were extracted from N. scintillans cells. NH 4 + -N and PO 4 3--P excretion rates were much higher during the first 1-3 h, and decreased rapidly with time. Daily NH 4 + -N and PO 4 3--P supply by N. scintillans excretion was estimated to be on average 34.8% and 55.3%, especially 50.6-85.4% and 80.5-135.8% in April-July (monthly mean), of the daily N and P requirement for primary production, respectively. The large amounts of nutrients regenerated and released by N. scintillans excretion can increase the N and P concentrations in ambient seawater, especially in the upper layer in spring-summer, and consequently affect phytoplankton (diatom) abundance. These may exacerbate eutrophication in these waters by a mutually supportive relationship between phytoplankton and N. scintillans: bottom-up control (phytoplankton-N. scintillans) and nutrient supply by N. scintillans to phytoplankton through excretion.

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Section: Seasonal Variations In Abundancementioning

confidence: 99%

Seasonal variability of the red tide-forming heterotrophic dinoflagellate Noctiluca scintillans in the neritic area of Sagami Bay, Japan: its role in the nutrient-environment and aquatic ecosystem

Ara

Nakamura

Takahashi

et al. 2013

Plankton Benthos Res

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“…Once the experiment was set up, 2-mL samples of G. catenatum culture were used for counting at 0, 24, 48, 72, and 120 h. One 100-mL sample was fixed with lugol to calculate the proportion of N. scintillans with and without G. catenatum in their vacuoles. These concentrations were based on cell densities of previous N. scintillans (Uhlig and Sahling 1990, Kirchner et al 1996, Cortés-Altamirano et al 2007 and G. catenatum blooms (Band-Schmidt et al 2010, Hallegraeff et al 2012, Quijano-Scheggia et al 2012.…”

Section: Noctiluca Scintillansmentioning

confidence: 99%

“…Se fijó una muestra de 100 mL con lugol para calcular la proporción de N. scintillans con y sin G. catenatum dentro de sus vacuolas. Estás concentraciones se basaron en las abundancias previas registradas en florecimientos de N. scintillans (Uhlig y Sahling 1990, Kirchner et al 1996, Cortés-Altamirano et al 2007) y G. catenatum (Band-Schmidt et al 2010, Hallegraeff et al 2012, QuijanoScheggia et al 2012.…”

Section: Ingestion Ratesunclassified

“…The natural diet of N. scintillans consists of an array of prey, including phytoplankton, nauplii, zooplankton eggs, organic detritus, and bacteria (Schaumann et al 1988, Kirchner et al 1996, Elbrächter and Qi 1998, Quevedo et al 1999. Negative aspects of Noctiluca grazing on Acartia clausi eggs and nauplii have been reported.…”

Section: Our Field Observations Show That N Scintillans Engulfs G Cmentioning

confidence: 99%

“…El análisis estadístico no mostro diferencias significativas en los porcentajes de N. scintillans con la presa en su interior entre las tres concentraciones de G. catenatum probadas, lo que sugiere que no existió una saciedad del alimento. La dieta natural de N. scintillans incluye varias presas, como fitoplancton, nauplios, huevos de zooplancton, detritus orgánico y bacterias (Schaumann et al 1988, Kirchner et al 1996, Elbrächter y Qi 1998, Quevedo et al 1999. Se han documentado algunos aspectos negativos del pastoreo de Noctiluca sobre huevos de Acartia clausi y nauplios.…”

Section: Interaccion De Noctiluca Scintillans Y Gymnodinium Catenatumunclassified

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

et al. 2013

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ABSTRACT. 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. RESUMEN. Se monitoreó la temperatura y los nutrientes durante una proliferación de Noctiluca scintillans y Gymnodinium catenatum en la bahía de La Paz, golfo de California. También, bajo condiciones de laboratorio, se mezclaron diferentes concentraciones de G. catenatum (312, 625, o 1015 células mL -1 ) con 0.53 células de N. scintillans mL -1 a fin de evaluar las tasas de pastoreo. La experimentación se llevó a cabo en 750 mL de cultivo durante un periodo de cinco días. La temperatura superficial mostró claramente un periodo de transición de agua fría a caliente durante la proliferación. Las observaciones de campo y las de laboratorio mostraron que N. scintillans se alimentaba de G. catenatum. En el laboratorio, más del 70% de N. scintillans contenía células de G. catenatum en sus vacuolas. La tasas de ingestión variaron ampliamente; los valores más altos variaron de 30 a 40 células de G. catenatum h -1 en cada célula de N. scintillans. No se observó una relación entre las diferentes concentraciones de G. catenatum ofrecidas y la tasa de ingestión. Al final del experimento se observaron tasas de ingestión bajas de 1 a 3 células de G. catenatum h -1 en cada célula de N. scintillans. La concentración de N. scintillans se duplicó aproximadamente cada 48 h; sin embargo, observamos numerosos trofontes saliendo de su cubierta externa, lo cual sugiere que existió daño celular. Estos datos indican que N. scintillans ingiere a G. catenatum pero la presa parece dañar al depredador en un corto plazo.Palabras clave: Gymnodinium catenatum, Noctiluca scintillans, pastoreo, biocontrol, bahía de La Paz.

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