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

Environmental Factors Affecting the Distribution of Pseudo-nitzschia in Two Monsoonal Estuaries... Species of the diatom genus Pseudo-nitzschia, some of which produce the neurotoxin domoic acid (DA), were studied to see how environmental factors affect their distribution in two tropical monsoonal estuaries and how salinity influences the growth and toxicity of P. pungens. Pseudo-nitzschia pungens, P. multistriata, and P. seriata were present in both the Mandovi and Zuari estuaries, whereas P. australis and P. pseudodelicatissima appeared only in the Zuari estuary. Canonical correspondence analysis indicated a significant positive correlation between salinity and the occurrence of P. seriata in the Mandovi estuary and of P. pungens in the Zuari estuary. A strain of P. pungens isolated from the Zuari estuary showed significant variations in specific growth rate between salinities, in support of our finding of a relationship between salinity and its distribution in the field. The lowest growth rate (0.44 day−1) was at a salinity of 5 and it increased to a maximum (1.05–1.19 day−1) at salinities of 15 to 30, declining slightly (0.98 day−1) at a salinity of 35. The isolated strain produced DA but at low levels. DA production rates varied significantly with salinity; they were low and similar at salinities of 5–15 (2.56–3.12 ng ml−1 day−1) and increased with increasing salinity, reaching 5.25 ng ml−1 day−1 at 35. The observed variations in growth rate and DA production by P. pungens indicate the need to focus more on salinity as an environmental factor that affects this, and other Pseudo-nitzschia species, in these monsoonal waters. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Estuaries and Coasts Springer Journals

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

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Publisher
Springer US
Copyright
Copyright © 2018 by Coastal and Estuarine Research Federation
Subject
Environment; Environment, general; Ecology; Freshwater & Marine Ecology; Environmental Management; Coastal Sciences; Water and Health
ISSN
1559-2723
eISSN
1559-2731
D.O.I.
10.1007/s12237-018-0366-y
Publisher site
See Article on Publisher Site

Abstract

Species of the diatom genus Pseudo-nitzschia, some of which produce the neurotoxin domoic acid (DA), were studied to see how environmental factors affect their distribution in two tropical monsoonal estuaries and how salinity influences the growth and toxicity of P. pungens. Pseudo-nitzschia pungens, P. multistriata, and P. seriata were present in both the Mandovi and Zuari estuaries, whereas P. australis and P. pseudodelicatissima appeared only in the Zuari estuary. Canonical correspondence analysis indicated a significant positive correlation between salinity and the occurrence of P. seriata in the Mandovi estuary and of P. pungens in the Zuari estuary. A strain of P. pungens isolated from the Zuari estuary showed significant variations in specific growth rate between salinities, in support of our finding of a relationship between salinity and its distribution in the field. The lowest growth rate (0.44 day−1) was at a salinity of 5 and it increased to a maximum (1.05–1.19 day−1) at salinities of 15 to 30, declining slightly (0.98 day−1) at a salinity of 35. The isolated strain produced DA but at low levels. DA production rates varied significantly with salinity; they were low and similar at salinities of 5–15 (2.56–3.12 ng ml−1 day−1) and increased with increasing salinity, reaching 5.25 ng ml−1 day−1 at 35. The observed variations in growth rate and DA production by P. pungens indicate the need to focus more on salinity as an environmental factor that affects this, and other Pseudo-nitzschia species, in these monsoonal waters.

Journal

Estuaries and CoastsSpringer Journals

Published: Feb 1, 2018

References

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