Toxic red-tide in the Argentine Sea. Phytoplankton distribution and survival of the toxic dinoflagellate Gonyaulax excavata in a frontal area

Carreto, José I.; Benavides, Hugo; Negri, Rubén M.; Glorioso, Pablo D.

doi:10.1093/plankt/8.1.15

Cited by 127 publications

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“…It is therefore evident that frontal zones play a key role in ecological processes of the ocean (Acha et al 2004), allowing an exceptionally large primary production (Carreto et al 1986), offering adequate feeding and reproductive habitats for planktivorous species and acting as retention areas for larvae. In the Peninsula Valdés frontal system, homogeneous and transitional waters constitute a suitable environment for the small fraction of zooplankton, and the abundances of these prey foods would be important for the survival and growth of first-feeding larvae.…”

Section: Discussionmentioning

confidence: 99%

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Potential zooplankton preys (Copepoda and Appendicularia) for Engraulis anchoita in relation to early larval and spawning distributions in the Patagonian frontal system (SW Atlantic Ocean)

et al. 2011

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SUMMARY:We investigated the spatial distribution of the abundance, biomass and size of zooplankton (nauplii, calanoids, cyclopoids and appendicularians) in relation to the distribution of first-feeding larvae and eggs of Engraulis anchoita across the frontal system of Peninsula Valdés. Twelve samples of zooplankton and ichthyoplankton were taken with small Bongo (67 µm) and Pairovet (200 µm) nets during the spring of 2004 along two transects. The total abundance of zooplankton and the chlorophyll a concentration were higher in homogeneous waters, while total biomasses were higher in stratified waters. Temperature was negatively correlated with biological variables and was the main factor affecting the zooplankton distribution. In both transects, abundance peaks of first-feeding larvae were detected at coastal stations along with the smallest fraction of zooplankton (<500 µm), while the largest fraction was dominant at the external stations, coinciding with the highest egg abundance. The physical structure of this front generates different levels of food availability for first-feeding larvae. Calanoids (southern transect) and cyclopoids (northern transect) are predominant followed by nauplii and appendicularians. The biomass of zooplankton preys contributes to the carbon transfer to the upper trophic levels and is probably important for the survival and growth of anchovy larvae in this frontal system. Keywords: southwestern Atlantic Ocean, North Patagonian frontal system, copepods, appendicularians, zooplanktonanchovy linkage.RESUMEN: Potenciales presas zooplanctónicas (Copepoda y Appendicularia) para Engraulis anchoita en relación con las distribuciones de larvas tempranas y de desove en la región frontal patagónica (océano Atlán-tico sudoccidental). -Se investigó la distribución espacial de la abundancia, biomasa y las tallas del zooplancton (nauplii, calanoideos, ciclopoideos y apendicularias) en relación con la distribución de las larvas en estadio de primera alimentación y los huevos de Engraulis anchoita en el sistema frontal de Península Valdés. Se tomaron 12 muestras de zooplancton e ictioplancton durante la primavera de 2004 a lo largo de dos transectos, mediante una red Minibongo (67 µm) y una Pairovet (200 µm) respectivamente. La abundancia total del zooplancton y la concentración de clorofila fue mayor en aguas homogéneas, mientras que la biomasa fue mayor en aguas estratificadas. La temperatura se correlacionó negativamente con las variables biológicas siendo ésta el principal factor que afectó la distribución del zooplancton. En las estaciones costeras de ambos transectos, se encontró la mayor abundancia de larvas en coincidencia con la fracción más pequeña de zooplancton (<500 µm), mientras que la fracción más grande fue dominante en las estaciones externas, en coincidencia con la mayor abundancia de huevos. La estructura física de este frente genera diferente disponibilidad de alimento para las larvas siendo los calanoideos (transecto sur) y los ciclopoideos (transecto norte) predominantes, seguid...

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Section: Discussionmentioning

confidence: 99%

“…This feature, combined with the stratification of shelf waters induced by seasonal surface warming, results in the highly mixed coastal waters being separated from the stratified offshore waters. This structure is maintained until autumn when stratification breaks down (Carreto et al 1986, Glorioso 1987, Acha et al 2004.…”

Section: Introductionmentioning

confidence: 97%

Potential zooplankton preys (Copepoda and Appendicularia) for Engraulis anchoita in relation to early larval and spawning distributions in the Patagonian frontal system (SW Atlantic Ocean)

et al. 2011

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“…Our CTD profile data agree well with previous findings on tides (Piola and Rivas, 1997) and the general oceanography of the SJG (Baldoni, 1990). Tidal fronts generate seasonal development and retention during the spring and late autumn (Carreto et al, 1985(Carreto et al, , 1986Glorioso and Flather, 1997;Guerrero and Piola, 1997).…”

Section: Oceanographic Parameters and Biogeographical Association Of mentioning

confidence: 99%

Analysis of the hydrographic conditions and cyst beds in the San Jorge Gulf, Argentina, that favor dinoflagellate population development including toxigenic species and their toxins

Krock

Borel

Barrera

et al. 2015

Journal of Marine Systems

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The overlay of cooler nutrient enriched Beagle-Magellan water with warmer nutrient depleted shelf water and a strong stratification of the water column in the San Jorge Gulf region, Argentina, coincided with relatively high dinoflagellate abundances in April 2012, up to 34,000 cells L −1 . This dinoflagellate proliferation was dominated by Ceratium spp., but environmental conditions also favored to a lesser amount the occurrence of toxigenic dinoflagellates, such as Alexandrium tamarense and Protoceratium reticulatum, whose toxins were hardly detected in any other areas along the expedition transect of the R/V Puerto Deseado between 38 and 56°S (Ushuaia-Mar del Plata) in March/April 2012. Generally vegetative cells of A. tamarense and P. reticulatum co-occurred with their respective phycotoxins in the water column and their cysts in the upper sediment layers. Two strains of A. tamarense were isolated from the bloom sample and morphologically characterized. Their PSP toxin profiles consisted of C1/2, gonyautoxins 1/4 and to a lesser amount of neosaxitoxin and confirmed earlier data from this region. The ratios between autotrophic picoplankton and heterotrophic bacteria were higher in shelf waters in the north than in Beagle-Magellan waters in the south of San Jorge Gulf.

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“…The studies were carried out in three different regions (Fig. 1) in the South-western Atlantic Ocean (Alheit et al, 1991) and comprised: a-An area in the Argentine shelf, Region A (42°S), characterized by tidal mixing fronts off Península Valdés (Carreto et. al., 1986a;Glorioso, 1987).…”

Section: Introductionmentioning

confidence: 99%

Environmental patterns and biomass distribution of gelatinous macrozooplankton. Three study cases in the South-western Atlantic Ocean

Mianzán¹,

Guerrero²

2000

Sci. Mar.

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Toxic red-tide in the Argentine Sea. Phytoplankton distribution and survival of the toxic dinoflagellate Gonyaulax excavata in a frontal area

Cited by 127 publications

References 0 publications

Potential zooplankton preys (Copepoda and Appendicularia) for <i>Engraulis anchoita</i> in relation to early larval and spawning distributions in the Patagonian frontal system (SW Atlantic Ocean)

Potential zooplankton preys (Copepoda and Appendicularia) for <i>Engraulis anchoita</i> in relation to early larval and spawning distributions in the Patagonian frontal system (SW Atlantic Ocean)

Analysis of the hydrographic conditions and cyst beds in the San Jorge Gulf, Argentina, that favor dinoflagellate population development including toxigenic species and their toxins

Environmental patterns and biomass distribution of gelatinous macrozooplankton. Three study cases in the South-western Atlantic Ocean

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