Ingestion and clearance rates of the red Noctiluca scintillans fed on the toxic dinoflagellate Alexandrium minutum (Halim)

Frangópulos, Máximo; Spyrakos, Evangelos; Guisande, Cástor

doi:10.1016/j.hal.2010.11.002

Cited by 27 publications

(19 citation statements)

References 43 publications

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“…Noctiluca scintillans containing toxigenic Dinophysis and Pseudonitzschia species may act as a vector of toxigenic algae to higher trophic levels or transport to shellfish aquaculture [79]. On the other hand, grazing pressure by N. scintillans on the growth of other toxigenic dinoflagellates should be considered as a potential regulator of phytoplankton toxins production [80]. This is of particularly interest in our study area, due to its close vicinity to the biggest mussel culture of Greece, where a harvest ban is often implemented due to Dinophysis spp.…”

Section: Red Tidesmentioning

confidence: 99%

Phytoplankton Blooms, Red Tides and Mucilaginous Aggregates in the Urban Thessaloniki Bay, Eastern Mediterranean

et al. 2019

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We investigated the plankton community composition and abundance in the urban marine environment of Thessaloniki Bay. We collected water samples weekly from March 2017 to February 2018 at the coastal front of Thessaloniki city center and monthly samples from three other inshore sites along the urban front of the bay. During the study period, conspicuous and successive phytoplankton blooms, dominated by known mucilage-producing diatoms alternated with red tide events formed by the dinoflagellates Noctiluca scintillans and Spatulodinium pseudonoctiluca, and an extensive mucilage aggregate phenomenon, which appeared in late June 2017. At least 11 known harmful algae were identified throughout the study, with the increase in the abundance of the known harmful dinoflagellate Dinophysis cf. acuminata occurring in October and November 2017. Finally, a red tide caused by the photosynthetic ciliate Mesodinium rubrum on December 2017 was conspicuous throughout the sampling sites. The above-mentioned harmful blooms and red tides were linked to high nutrient concentrations and eutrophication. This paper provides an overview of eutrophication impacts on the response of the unicellular eukaryotic plankton organisms and their impact on water quality and ecosystem services.A large volume of domestic and industrial wastes from the city of Thessaloniki has been directed for decades to the Thermaikos Gulf and especially its inner part, Thessaloniki Bay. In the 20 th century, these wastes were discharged in the Bay without treatment, causing the eutrophication of the system. Since 2001, wastewater treatment has been implemented, decreasing the effects of anthropogenic eutrophication [17]. Although it is generally accepted in the public that the water quality in the Thermaikos Gulf has been improved compared to 20-30 years ago [18,19], the urban front of the Thessaloniki Bay, with restricted water circulation and shallowness, still exhibits apparent red tides and algal blooms. These events are usually the cause of irritation to the public, often mentioned in the Greek media, with subsequent socio-economic consequences to the city of Thessaloniki, especially the touristic center. Despite the growing concerns of the citizens and authorities on the water quality of the Bay and particularly of the urban front, only scarce and isolated studies have been published on the abundance and dynamics of plankton community (both phyto-and protozooplankton) in the urban part of the Gulf [20,21]. On the other hand, several studies in the broader Thermaikos Gulf have focused on phytoplankton [18,22,23] and the occurrence of HABs [24,25]. However, comprehensive studies on red tides and mucilage aggregate phenomena are lacking for the Thermaikos Gulf.According to the related legislation for the ecological water quality based on nutrient pressures and the phytoplankton quality element (Water Framework Directive; WFD, 2000/60/EC) there is a need for systematic and frequent monitoring of coastal waters. Furthermore, similar to the WFD objectives are those...

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Section: Red Tidesmentioning

confidence: 99%

Phytoplankton Blooms, Red Tides and Mucilaginous Aggregates in the Urban Thessaloniki Bay, Eastern Mediterranean

et al. 2019

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“…The vacuoles of this species contain toxigenic microalgae and may play an important role in the population dynamics of harmful algae (Alonso-Rodríguez et al 2005, Escalera et al 2007, Azanza et al 2009). Excretion or bioconversion of ingested saxitoxin and analogues by N. scintillans to less potent analogues (Azanza et al 2009, Frangópulos et al 2011 provides additional support for this suggestion. The dinoflagellate Gymnodinium catenatum Graham 1943 is one of the main producers of paralytic shellfish poisons (PSP) and bloom-forming species off the west coast of Mexico.…”

Section: Introductionmentioning

confidence: 83%

“…Como depredador, sus vacuolas alimenticias pueden contener algas tóxicas y jugar un papel importante en la dinámica de los florecimientos algales nocivos (Alonso-Rodríguez et al 2005, Escalera et al 2007, Azanza et al 2009). Los procesos de bioconversión o excreción de la saxitoxina a sus análogos de menor potencia proveen información adicional para esta sugerencia (Azanza et al 2009, Frangópulos et al 2011. El dinoflagelado Gymnodinium catenatum Graham 1943 es uno de los principales productores de toxina paralizante de moluscos y formadores de florecimientos de la costa oeste de México.…”

Section: Field Measurementsunclassified

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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“…On the other hand, Nakamura (1998b) and Tada et al (2003) suggested that feeding selectivity of N. scintillans on diatoms was not significantly different from that on dinoflagellates. Frangópulos et al (2011) reported that even the toxic dinoflagellate Alexandrium minutum Halim was a good prey item for N. scintillans. All these results, which are not always consistent with each other, were obtained in laboratory incubation experiments.…”

Section: Discussionmentioning

confidence: 99%

Predation pressure of Noctiluca scintillans on diatoms and thecate dinoflagellates off the western coast of Kyushu, Japan

Suzuki

Yamamoto

Narasaki

2013

Plankton Benthos Res

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Predation pressure of Noctiluca scintillans on diatoms and thecate dinoflagellates was investigated off the western coast of Kyushu, Japan by a comparison between the taxonomic composition of prey in the food vacuoles of N. scintillans and that in the ambient water. The ratios of total diatoms and centric diatoms in the food vacuoles were higher than those in the ambient water, while thecate dinoflagellates and pennate daitoms showed a reverse trend. These results indicate that predation pressure of N. scintillans on total diatoms is higher than on thecate dinoflagellates, and that the pressure on centric diatoms is stronger than that on pennate ones. Among the centric diatoms, Chaetoceros and Bacteriastrum were dominant in the food vacuoles and their respective ratios were higher than in the ambient water. Their chain-forming colonies with long setae appear to be easily trapped by N. scintillans tentacles and this is probably the cause of the high predation pressure of N. scintillans on centric diatoms.

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Ingestion and clearance rates of the red Noctiluca scintillans fed on the toxic dinoflagellate Alexandrium minutum (Halim)

Cited by 27 publications

References 43 publications

Phytoplankton Blooms, Red Tides and Mucilaginous Aggregates in the Urban Thessaloniki Bay, Eastern Mediterranean

Phytoplankton Blooms, Red Tides and Mucilaginous Aggregates in the Urban Thessaloniki Bay, Eastern Mediterranean

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

Predation pressure of Noctiluca scintillans on diatoms and thecate dinoflagellates off the western coast of Kyushu, Japan

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