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<p>This study delineates the variability in phytoplankton and microzooplankton community composition and abundance during and after the occurrence of harmful <i>Prorocentrum rhathymum</i> (dinoflagellate) bloom encountered in the coastal waters of Alappuzha, southwest coast of India. During bloom phase (August), prolific growth of <i>P. rhathymum</i> was observed in the nearshore stations, especially in S2 (3200 × 10<sup>3</sup> cells/L) with high Chl <i>a</i> (79.43&#xa0;mg&#xa0;m<sup>−3</sup>), which subsequently declined during non-bloom phase (September). The study area exhibited marked variations in phytoplankton and microzooplankton community composition between the bloom and non-bloom phases, characterized by the transition from phytoflagellates to diatoms and from loricates to aloricates, particularly at the nearshore stations. Our findings suggest that the nutrient enrichment, specifically from enhanced levels of ammonium and phosphate due to coastal upwelling, favoured the bloom. Furthermore, the subsequent decline of the bloom was influenced by the top-down control exerted by microzooplankton, especially loricates, in conjunction with pronounced changes in environmental variables.</p>

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Insights on phytoplankton and microzooplankton community changes amidst and in the aftermath of harmful dinoflagellate bloom (Prorocentrum rhathymum) in the coastal waters of Alappuzha, Southwest coast of India

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • Shini Shaji,
  • Miriam Paul Sreeram,
  • Anil Peariya,
  • Grinson George,
  • Raveendran Ratheeshkumar,
  • Aju Kallumpurathu Raju,
  • Kaippaparambil Manikandan Sreekumar,
  • Lakshmanan Sreesanth,
  • Thobias Pulikal Antony

摘要

This study delineates the variability in phytoplankton and microzooplankton community composition and abundance during and after the occurrence of harmful Prorocentrum rhathymum (dinoflagellate) bloom encountered in the coastal waters of Alappuzha, southwest coast of India. During bloom phase (August), prolific growth of P. rhathymum was observed in the nearshore stations, especially in S2 (3200 × 103 cells/L) with high Chl a (79.43 mg m−3), which subsequently declined during non-bloom phase (September). The study area exhibited marked variations in phytoplankton and microzooplankton community composition between the bloom and non-bloom phases, characterized by the transition from phytoflagellates to diatoms and from loricates to aloricates, particularly at the nearshore stations. Our findings suggest that the nutrient enrichment, specifically from enhanced levels of ammonium and phosphate due to coastal upwelling, favoured the bloom. Furthermore, the subsequent decline of the bloom was influenced by the top-down control exerted by microzooplankton, especially loricates, in conjunction with pronounced changes in environmental variables.