期刊
HARMFUL ALGAE
卷 70, 期 -, 页码 52-63出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.hal.2017.10.006
关键词
HAB dynamics; Paralytic shellfish poisoning (PSP); Planozygote; Resting cyst; Saxitoxin
资金
- Malaysian government through the Ministry of Higher Education under HICoE Fund [IOES-2014C]
- Ministry of Science, Technology and Innovation [04-01-03-SF1011]
- JSPS Core-to-Core Program
- Ministry of Higher Education MyBrain Scholarship
In 2015, a remarkably high density bloom of Alexandrium minutum occurred in Sungai Geting, a semi enclosed lagoon situated in the northeast of Peninsular Malaysia, causing severe discoloration and contaminated the benthic clams (Polymesoda). Plankton and water samples were collected to investigate the mechanisms of bloom development of this toxic species. Analysis of bloom samples using flow cytometry indicated that the bloom was initiated by the process of active excystment, as planomycetes (>4C cells) were observed in the early stage of the bloom. Increase in planozygotes (2C cells) was evident during the middle stage of the bloom, coinciding with an abrupt decrease in salinity and increase of temperature. The bloom was sustained through the combination of binary division of vegetative cells, division of planozygotes, and cyst germination through continuous excystment. Nutrient depletion followed by precipitation subsequently caused the bloom to terminate. This study provides the first continuous record of in situ life-cycle stages of a natural bloom population of A. minutum through a complete bloom cycle. The event has provided a fundamental understanding of the pelagic life-cycle stages of this tropical dinoflagellate, and demonstrated a unique bloom development characteristic shared among toxic Alexandrium species in coastal embayments. (C) 2017 Elsevier B.V. All rights reserved.
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