Pseudo-nitzschia species population dynamics in the Quoddy Region, Bay of Fundy

Kaczmarska, Irena; Martin, Jennifer L.; Ehrman, James M.; LeGresley, Murielle M.

doi:10.1016/j.hal.2007.05.001

Cited by 41 publications

(32 citation statements)

References 43 publications

(67 reference statements)

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“…blooms in the natural environment are often associated with high abundances of other algal species (Fehling et al 2006, Mafra et al 2006, Spatharis et al 2007), including multiple Pseudonitzschia spp. (Rines et al 2002, Kaczmarska et al 2007, this finding suggests that DA intake by oysters could be facilitated in mixed suspensions with a more palatable food source. In the present study, oyster gills were shown to clear P. multiseries cells at similar or higher rates than flagellate species in a mixed suspension.…”

Section: Discussionmentioning

confidence: 82%

Mechanisms contributing to low domoic acid uptake by oysters feeding on Pseudo-nitzschia cells. II. Selective rejection

Mafra¹,

Bricelj²,

Ward³

2009

Aquat. Biol.

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Oysters accumulate relatively low levels of domoic acid (DA) compared to other bivalves. Mafra et al. (2009, in this Theme Section) identified feeding mechanisms of oysters that may lead to low DA accumulation during monospecific blooms of Pseudo-nitzschia multiseries. However, several different species of Pseudo-nitzschia, as well as other diatoms and flagellates, may co-occur during a bloom. Therefore, the present study investigates pre-ingestive feeding processes that operate when oysters Crassostrea virginica are exposed to mixed phytoplankton assemblages containing P. multiseries of varying cell length. Guided by video-endoscopy, material transported along the ventral and dorsal gill tracts was sampled and analyzed to determine the site for sorting of microalgae on the pallial organs. There was no preferential rejection of P. multiseries in pseudofeces when oysters were exposed to the alga in a mixed suspension with other diatom species (Thalassiosira weissflogii or Chaetoceros muelleri). In contrast, P. multiseries was preferentially rejected when mixed with the flagellates Isochrysis galbana or Rhodomonas lens, suggesting a qualitative mechanism for particle sorting. This occurred on the gills, followed by further selection on the palps. Oysters also preferentially rejected larger P. multiseries cells (82 to 90 µm) relative to smaller ones (24 to 28 µm) on the gills, while no further selection based on size occurred on the palps. This effect is attributed to the fact that P. multiseries cells with a length that exceeds the width of the principal filament aperture (ca. 68 µm) are more likely directed to the ventral tract and rejected in pseudofeces. These findings offer an additional explanation for the relatively low DA levels found in oysters during natural Pseudo-nitzschia spp. blooms.

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Section: Discussionmentioning

confidence: 82%

Mechanisms contributing to low domoic acid uptake by oysters feeding on Pseudo-nitzschia cells. II. Selective rejection

Mafra¹,

Bricelj²,

Ward³

2009

Aquat. Biol.

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“…In the South China Sea, Pseudo-nitzschia abundances responded to increased land runoff after rainfall (Qi et al, 1994) and in the Aegean Sea, Greece, a winter bloom of P. calliantha appeared to be induced by agricultural runoff shortly after a strong rainfall event (Spatharis et al, 2007). An analysis of P. delicatissima and P. pseudodelicatissima dynamics and environmental parameters in the Bay of Fundy, Canada, showed a strong relationship between NO 3 À and NO 2 À concentrations and the abundance of these species (Kaczmarska et al, 2007). These coastal studies show a response to riverine nutrients, changing nutrient ratios and eutrophication.…”

Section: Ecological Profile Of Pseudo-nitzschia Speciesmentioning

confidence: 78%

Pseudo-nitzschia physiological ecology, phylogeny, toxicity, monitoring and impacts on ecosystem health

et al. 2012

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“…These species seem to have a broad physiological range for growth (Lundholm et al, 2003;Caropo et al, 2005;Amato et al, 2007;Kaczmarska et al, 2007;Spatharis et al, 2007;Besiktepe et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

<i>Pseudo-nitzschia</i> species on the Catalan coast: characterization and contribution to the current knowledge of the distribution of this genus in the Mediterranean Sea

Quijano-Scheggia¹,

Garcés²,

Andrée

et al. 2010

Sci. Mar.

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SUMMARY: Proliferations of the genus Pseudo-nitzschia recur along the Catalan coast (NW Mediterranean) throughout the year. The establishment of 58 clonal cultures facilitated morphological studies with scanning electron microscopy (SEM) and ITS 5.8S rDNA sequence characterization. Moreover, strains of each species were examined with respect to sexual compatibility and toxicity. The results of the morphological and phylogenetic studies confirmed nine species of the genus Pseudo-nitzschia: P. brasiliana, P. calliantha, P. delicatissima clade A/del 2, P. arenysensis, P. fraudulenta, P. galaxiae, P. linea, P. multistriata and P. pungens clade I. Moreover, two Pseudo-nitzschia species, P. caciantha and P. cf mannii, could only be identified following SEM analysis of their morphology. None of the cultured strains of Pseudo-nitzschia analyzed produced domoic acid in amounts above the limit of detection. The current distributions of the Pseudo-nitzschia species in the Mediterranean Sea were plotted on maps, which led to the following observations: i) diversity within this genus is much greater than previously considered, ii) some species have a broad distribution (e.g. P. calliantha), iii) whereas the distribution of others is narrowly restricted (e.g. P. pungens clade I). Moreover, this study reports the first detection of P. linea in the Mediterranean Sea and is the first description of P. galaxiae and P. cf mannii along the Catalan coast. Morphological studies coupled with molecular biological characterization, mating tests and biogeographic distribution analyses provide a critical theoretical basis for testing and/or implementing the current phylogenetic framework in the genus Pseudo-nitzschia.Keywords: Pseudo-nitzschia, ITS, morphology, mating compatibility, toxin, Mediterranean Sea.RESUMEN: Especies Pseudo-nitzschia en la costa catalana: caracterización y contribución al conocimiento actual de la distribución del género en el mar Mediterráneo. -Las proliferaciones del género Pseudo-nitzschia son recurrentes durante todo año en la costa catalana (Mediterráneo NO). El establecimiento de 58 cultivos clonales han facilitado la comparación morfológica por medio del microscopio óptico y electrónico de barrido y la secuenciación del gen ADN ribosomal ITS 5.8S. Además se examinó la compatibilidad sexual de las cepas de cada una de las especie juntamente con el análisis de toxicidad. Los resultados del estudio morfológico y filogenético confirmaron nueve especies del género Pseudo-nitzschia: P. brasiliana, P. calliantha, P. delicatissima clade A/del 2, P. arenysensis, P. fraudulenta, P. galaxiae, P. linea, P. multistriata y P. pungens clade I. Se identificaron morfológicamente dos especies de Pseudo-nitzschia con SEM: P. caciantha y P. cf manii. Ningún cultivo clonal de Pseudo-nitzschia mostró producción de acido domóico por encima del límite de detección. Se muestra la distribución actual de especies de Pseudo-nitzschia en el mar Mediterráneo y esto permite concluir que: i) la diversidad del género es más amplia que lo c...

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Pseudo-nitzschia species population dynamics in the Quoddy Region, Bay of Fundy

Cited by 41 publications

References 43 publications

Mechanisms contributing to low domoic acid uptake by oysters feeding on Pseudo-nitzschia cells. II. Selective rejection

Mechanisms contributing to low domoic acid uptake by oysters feeding on Pseudo-nitzschia cells. II. Selective rejection

Pseudo-nitzschia physiological ecology, phylogeny, toxicity, monitoring and impacts on ecosystem health

<i>Pseudo-nitzschia</i> species on the Catalan coast: characterization and contribution to the current knowledge of the distribution of this genus in the Mediterranean Sea

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