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<p>To elucidate the mechanism of winter diatom blooms in Ariake Bay, particularly <i>Eucampia zodiacus</i> Ehrenberg blooms, field observations of the entire bay and observations using an automated observation buoy system at a fixed point were conducted from November 2018 to March 2019. <i>Chaetoceros</i> spp., <i>Skeletonema</i> spp., and <i>E</i>. <i>zodiacus</i> blooms were observed during the study period. The vertical distribution of the physical parameters in Ariake Bay showed that vertical mixing occurred throughout the bay from November to December. In contrast, density stratification gradually occurred in the inner part of the bay from February as precipitation and water temperature increased. Monitoring data from automated observation buoys showed that salinity stratification occurred during neap tides in February, and the blooms of <i>E</i>. <i>zodiacus</i> developed during this event. Although <i>E</i>. <i>zodiacus</i> was distributed throughout the water column, the vertical distribution of dissolved oxygen indicated that it increased in the upper mixed layer. However, populations in the bottom layer may be transported inshore to estuaries via estuarine circulation. In summary, the formation of salinity stratification owing to increased river discharge from February and the associated estuarine circulation are essential factors in developing <i>E</i>. <i>zodiacus</i> blooms.</p>

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Development of Eucampia zodiacus blooms associated with salinity stratification in Ariake Bay during winter

  • 期刊论文

  • 发表日期：

    2025年2月5日

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  • Akira Yamaguchi,
  • Kouki Fukuoka,
  • Kazumaro Okamura,
  • Hiroshi Ota,
  • Tsuyoshi Naitou,
  • Shinichiro Abe

摘要

To elucidate the mechanism of winter diatom blooms in Ariake Bay, particularly Eucampia zodiacus Ehrenberg blooms, field observations of the entire bay and observations using an automated observation buoy system at a fixed point were conducted from November 2018 to March 2019. Chaetoceros spp., Skeletonema spp., and E. zodiacus blooms were observed during the study period. The vertical distribution of the physical parameters in Ariake Bay showed that vertical mixing occurred throughout the bay from November to December. In contrast, density stratification gradually occurred in the inner part of the bay from February as precipitation and water temperature increased. Monitoring data from automated observation buoys showed that salinity stratification occurred during neap tides in February, and the blooms of E. zodiacus developed during this event. Although E. zodiacus was distributed throughout the water column, the vertical distribution of dissolved oxygen indicated that it increased in the upper mixed layer. However, populations in the bottom layer may be transported inshore to estuaries via estuarine circulation. In summary, the formation of salinity stratification owing to increased river discharge from February and the associated estuarine circulation are essential factors in developing E. zodiacus blooms.