Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Mass Occurrence of the Salp Salpa fusiformis during Spring 2017 in the Southern Waters of Korea and the Northern East China Sea

2017년 봄철 한국 남해와 북부동중국해의 살파 Salpa fusiformis 대량 출현

  • 강형구 (한국해양과학기술원 해양생태연구센터) ;
  • 김가람 (한국해양과학기술원 해양생태연구센터) ;
  • 강정훈 (한국해양과학기술원 남해연구소) ;
  • 김민주 (한국해양과학기술원 남해연구소) ;
  • 노재훈 (한국해양과학기술원 해양생태연구센터)
  • Received : 2019.05.14
  • Accepted : 2019.09.03
  • Published : 2019.09.30
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Abstract

We investigated the mass occurrence of the salp Salpa fusiformis during spring in the southern waters of Korea and the northern East China Sea. Abundance of S. fusiformis and dominant taxonomic groups including copepods, ostracods, euphausiids, and appendicularian was examined along with environmental factors (e.g., temperature, salinity, and chlorophyll-a concentration). The abundance of S. fusiformis at 27 stations ranged from 0 to $183\;inds\;m^{-3}$. Both aggregate and solitary forms of S. fusiformis occurred with a mean abundance of $62\;inds\;m^{-3}$ and $4\;inds\;m^{-3}$, and mean body length of 6.5 mm and 15.4 mm, respectively. Redundancy analysis showed that the abundance of S. fusiformis was negatively correlated with chlorophyll-a concentration, indicating the intensive grazing impact of S. fusiformis on phytoplankton. While the abundance of S. fusiformis increased, the species diversity of zooplankton community decreased. The abundances of total copepods and the dominant copepod species (e.g., adults and/or copepodites of Paracalansus parvus s.l., Calanus sinicus, Oithona similis, and Corycaeus affinis) also decreased with the increase of S. fusiformis abundance. However, the abundance of ostracods, euphausiids, and appendicularians was not affected by the mass occurrence of the salps. These results suggest that the mass occurrence of S. fusiformis in spring could negatively affect ecosystem conditions by changing trophodynamics in the zooplankton community.

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References

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