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<p>To examine the effects of environmental variables on the abundance of <i>Calanus sinicus</i> in the Seto Inland Sea, we examined zooplankton samples collected monthly with a 335-µm meshed net at three stations in Harima-Nada over a 10-year period (2012–2021), and analyzed correlations with water temperature and chlorophyll-<i>a</i> concentration in different seasons. Because predation pressure by sand lance was assumed to be markedly different between the first and second halves of the 10-year study, the correlation analyses were performed separately for each 5-year period. The results showed that the correlations between <i>C. sinicus</i> abundance and temperature during the low-abundance season (August–December) and the highest-temperature season (August–October) were significantly negative in both of the 5-year periods, while there were no significant correlations in the other seasons nor between abundance and chlorophyll-<i>a</i> in any season. The abundance and stage composition of individuals differed significantly between the two 5-year periods, which may be due to changes in the strength of the top–down predation effect of sand lance. The negative impact of high summer temperatures on the low-abundance population suggests that further warming in the Seto Inland Sea could lead to localized extinction of <i>C. sinicus</i>.</p>

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Recent interannual variations of Calanus sinicus abundance and local extinction possibility in the eastern Seto Inland Sea due to warming

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Tetsuya Nishikawa,
  • Hiroshi Ueda

摘要

To examine the effects of environmental variables on the abundance of Calanus sinicus in the Seto Inland Sea, we examined zooplankton samples collected monthly with a 335-µm meshed net at three stations in Harima-Nada over a 10-year period (2012–2021), and analyzed correlations with water temperature and chlorophyll-a concentration in different seasons. Because predation pressure by sand lance was assumed to be markedly different between the first and second halves of the 10-year study, the correlation analyses were performed separately for each 5-year period. The results showed that the correlations between C. sinicus abundance and temperature during the low-abundance season (August–December) and the highest-temperature season (August–October) were significantly negative in both of the 5-year periods, while there were no significant correlations in the other seasons nor between abundance and chlorophyll-a in any season. The abundance and stage composition of individuals differed significantly between the two 5-year periods, which may be due to changes in the strength of the top–down predation effect of sand lance. The negative impact of high summer temperatures on the low-abundance population suggests that further warming in the Seto Inland Sea could lead to localized extinction of C. sinicus.