Life-history stages of natural bloom populations and the bloom dynamics of a tropical Asian ribotype of Alexandrium minutum

Winnie Lik Sing Lau, Ing Kuo Law, Guat Ru Liow, Kieng Soon Hii, Gires Usup, Po Teen Lim, Chui Pin Leaw

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)52-63
Number of pages12
JournalHarmful Algae
Volume70
DOIs
Publication statusPublished - 1 Dec 2017

Fingerprint

excystation
ribotypes
Polymesoda
algal bloom
life history
developmental stages
Alexandrium
vegetative cells
discoloration
clams
Malaysia
flow cytometry
plankton
cell division
cells
salinity
germination
sampling
nutrients
temperature

Keywords

  • HAB dynamics
  • Paralytic shellfish poisoning (PSP)
  • Planozygote
  • Resting cyst
  • Saxitoxin

ASJC Scopus subject areas

  • Aquatic Science
  • Plant Science

Cite this

Life-history stages of natural bloom populations and the bloom dynamics of a tropical Asian ribotype of Alexandrium minutum. / Lau, Winnie Lik Sing; Law, Ing Kuo; Liow, Guat Ru; Hii, Kieng Soon; Usup, Gires; Lim, Po Teen; Leaw, Chui Pin.

In: Harmful Algae, Vol. 70, 01.12.2017, p. 52-63.

Research output: Contribution to journalArticle

Lau, Winnie Lik Sing ; Law, Ing Kuo ; Liow, Guat Ru ; Hii, Kieng Soon ; Usup, Gires ; Lim, Po Teen ; Leaw, Chui Pin. / Life-history stages of natural bloom populations and the bloom dynamics of a tropical Asian ribotype of Alexandrium minutum. In: Harmful Algae. 2017 ; Vol. 70. pp. 52-63.
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