Environmental Factors Affecting the Distribution of Pseudo-nitzschia in Two Monsoonal Estuaries of Western India and Effects of Salinity on Growth and Domoic Acid Production by P. pungens

Pednekar, Suraksha; Bates, Stephen S.; Kerkar, Vijaya; Matondkar, S.G.P.

doi:10.1007/s12237-018-0366-y

Cited by 22 publications

(16 citation statements)

References 49 publications

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“…Additionally, a recent study by Pednekar et al. () showed that the highest growth rates were obtained at salinities of 15–25, and that higher and lower salinities resulted in a reduction of growth rate. This salinity range also corresponded to the area where this species was isolated and is commonly present in the Zuari and Mandovi estuaries in western India (Pednekar et al.…”

Section: Discussionmentioning

confidence: 96%

“…, Thessen and Stoecker , Markina and Aizdaicher , Van Meerssche and Pinckney , Pednekar et al. ). The results of these previous studies showed that high cell abundances and growth rates of Pseudo‐nitzschia cells were associated with high salinity levels.…”

Section: Discussionmentioning

confidence: 99%

“…, Van Meerssche and Pinckney , Pednekar et al. ). During cell growth in hypersaline conditions, diatoms can establish cellular adaptation mechanisms in order to compensate the osmotic pressure (Schobert ).…”

mentioning

confidence: 99%

“…() and Pednekar et al. () noticed an increase in DA production with increasing salinity in Pseudo‐nitzschia multiseries and P. pungens cells, the potential physiological role of DA as an osmolyte have not yet been fully confirmed (Doucette et al. , Lelong et al.…”

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confidence: 99%

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Influence of sudden salinity variation on the physiology and domoic acid production by two strains of Pseudo‐nitzschia australis

Ayache

Hervé

Véronique

et al. 2018

Journal of Phycology

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Several coastal countries including France have experienced serious and increasing problems related to Pseudo-nitzschia toxic blooms. These toxic blooms occur in estuarine and coastal waters potentially subject to fluctuations in salinity. In this study, we document for the first time the viability, growth, photosynthetic efficiency, and toxin production of two strains of Pseudo-nitzschia australis grown under conditions with sudden salinity changes. Following salinity variation, the two strains survived over a restricted salinity range of 30-35, with favorable physiological responses, as the growth, effective quantum yield and toxin content were high compared to the other conditions. In addition, high cellular quotas of domoic acid (DA) were observed at a salinity of 40 for the strain IFR-PAU-16.1 in comparison with the other strain IFR-PAU-16.2 where the cell DA content was directly released into the medium. On the other hand, the osmotic stress imposed at lower salinities, 20 and 10, resulted in cell lysis and a sudden DA leakage in the medium. Intraspecific variability was observed in growth and toxin production, with the strain IFR-PAU-16.1 apparently able to withstand higher salinities than the strain IFR-PAU-16.2. On the whole, DA does not appear to act as an osmolyte in response to sudden salinity changes. Since most of the shellfish harvesting areas of bivalve molluscs in France are located in areas where the salinity generally varies between 30 and 35, Pseudo-nitzschia australis blooms might potentially impact public health and commercial shellfish resources in these places.Abbreviations: API 4000 Trap, triple quadrupole mass spectrometer; ASP, amnesic shellfish poisoning; DA, domoic acid; dDA, dissolved domoic acid; F v /F m , effective quantum yield; LOD, Limit of detection; LOQ, Limit of quantification; QY, quantum yield; UFLC, ultra-fast liquid chromatography 1

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Influence of sudden salinity variation on the physiology and domoic acid production by two strains of Pseudo‐nitzschia australis

Ayache

Hervé

Véronique

et al. 2018

Journal of Phycology

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“…Understanding the relationships between the abundance of these diatoms, DA, and the characteristics of the environment will provide valuable information on the variable(s) that might determine their growth, distribution, and DA production. Several authors [18][19][20][21][22][23][24] have related these…”

Section: Introductionmentioning

confidence: 99%

Pseudo-nitzschia Blooms in a Coastal Upwelling System: Remote Sensing Detection, Toxicity and Environmental Variables

Palenzuela

Vilas

Bellas

et al. 2019

Water

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The NW coast of the Iberian Peninsula is dominated by extensive shellfish farming, which places this region as a world leader in mussel production. Harmful algal blooms in the area frequent lead to lengthy harvesting closures threatening food security. This study developed a framework for the detection of Pseudo-nitzschia blooms in the Galician rias from satellite data (MERIS full-resolution images) and identified key variables that affect their abundance and toxicity. Two events of toxin-containing Pseudo-nitzschia were detected (up to 2.5 μg L−1 pDA) in the area. This study suggests that even moderate densities of Pseudo-nitzschia in this area might indicate high toxin content. Empirical models for particulate domoic acid (pDA) were developed based on MERIS FR data. The resulting remote-sensing model, including MERIS bands centered around 510, 560, and 620 nm explain 73% of the pDA variance (R2 = 0.73, p < 0.001). The results show that higher salinity values and lower Si(OH)4/N ratios favour higher Pseudo-nitzschia spp. abundances. High pDA values seem to be associated with relatively high PO43, low NO3− concentrations, and low Si(OH)4/N. While MERIS FR data and regionally specific algorithms can be useful for detecting Pseudo-nitzschia blooms, nutrient relationships are crucial for predicting the toxicity of these blooms.

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Diatoms: the Living Jewels and their Biodiversity, Phycosphere and Associated Phenotypic Plasticity: A Lesson to Learn from the Current Pandemic of Coronavirus

Vinayak

Bhaskar

Pandey

et al. 2022

Biodiversity in India: Status, Issues and Challenges

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Environmental Factors Affecting the Distribution of Pseudo-nitzschia in Two Monsoonal Estuaries of Western India and Effects of Salinity on Growth and Domoic Acid Production by P. pungens

Cited by 22 publications

References 49 publications

Influence of sudden salinity variation on the physiology and domoic acid production by two strains of Pseudo‐nitzschia australis

Influence of sudden salinity variation on the physiology and domoic acid production by two strains of Pseudo‐nitzschia australis

Pseudo-nitzschia Blooms in a Coastal Upwelling System: Remote Sensing Detection, Toxicity and Environmental Variables

Diatoms: the Living Jewels and their Biodiversity, Phycosphere and Associated Phenotypic Plasticity: A Lesson to Learn from the Current Pandemic of Coronavirus

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