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Hidden thin layers of toxic diatoms in a coastal bay

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Item Summary

Title: Hidden thin layers of toxic diatoms in a coastal bay
Authors: Timmerman, Amanda Heesoon Vinson
Keywords: harmful algae blooms
Monterey Bay
pseudo-nitzschia bloom
Issue Date: Aug 2012
Publisher: [Honolulu] : [University of Hawaii at Manoa], [August 2012]
Abstract: Harmful algal blooms (HABs) can threaten animal and human health through the production of toxins such as domoic acid. These blooms have become more frequent and toxic over the last few decades. In this study, we investigate the role that nutrients play in a toxic, subsurface bloom of Pseudo-nitzschia in northeastern Monterey Bay, California. Profilers and towed instruments were deployed and laboratory analyses of discrete water samples were conducted to describe the physical and biogeochemical conditions of the sampling site and to characterize the bloom. The Pseudo-nitzschia bloom occurred within a well-defined subsurface layer, containing high levels of domoic acid. In situ images taken within the layer revealed diatom flocs-indicators of nutrient stress. Nutrient ratios and alkaline phosphatase activity, commonly used to determine the nutritional status of phytoplankton, suggest that the Pseudo-nitzschia cells were phosphate stressed, and we speculate that this physiological stress led to increased toxicity of the bloom. Understanding how frequently blooms such as these are characterized by nutrient stress could improve our ability to predict the occurrence of HABs. With increased anthropogenic input of nutrients, such blooms could occur more often and with greater degrees of toxicity in the future.
Description: M.S. University of Hawaii at Manoa 2012.
Includes bibliographical references.
Appears in Collections:M.S. - Oceanography

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