Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Effect of El Niño/Na Niña on Mesozooplankton Biomass in the Northwestern Subtropical Pacific Warm Pool and the Northern East China Sea

엘니뇨/라니냐가 북서태평양 아열대 난수역과 북부동중국해의 중형동물플랑크톤 생체량에 미치는 영향

  • 강형구 (한국해양과학기술원 생물.생태계연구본부) ;
  • 신창웅 (한국해양과학기술원 한.페루 해양과학기술 공동연구센터) ;
  • 전동철 (한국해양과학기술원 해양물리연구본부)
  • Received : 2015.07.20
  • Accepted : 2015.09.01
  • Published : 2015.09.30
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Abstract

Mesozooplankton biomass including total biomass and size-fractionated biomass and the abundance of major taxonomic groups of copepods were studied in the Northwestern Subtropical Pacific Warm Pool (NSPWP) and the Northern East China Sea (NECS) from 2006 to 2014. Mesozooplankton biomass ranged from 0.69 to $3.08mgC/m^3$ (mean $1.12mgC/m^3$) in the NSPWP and from 10.60 to $69.10mgC/m^3$ (mean $30.33mgC/m^3$) in the NECS with higher values in spring than fall. Percent composition in the biomass of each size group of mesozooplankton varied interannually both in the NSPWP and in the NECS. The smallest size group (0.2~0.5 mm) contributed the least to total biomass in both regions, but significantly higher in the NSPWP than in the NECS. The percent composition in abundance of copepod taxonomic groups (i.e. Calanoida, Cyclopoida, and Poecilostomatoida) also fluctuated interannually. Mean composition of calanoid copepods was higher in the NECS than in the NSPWP, but the opposite pattern was observed for poecilostomatoid copepods. Mesozooplankton biomass both in the NSPWP and in the NECS was negatively correlated with Oceanic $Ni{\tilde{n}}o$ Index (ONI), indicating declines in biomass during El $Ni{\tilde{n}}o$ periods and vice versa during Na $Ni{\tilde{n}}a$ period. The effect of El $Ni{\tilde{n}}o$ on variation of mesozooplankton biomass was more prominent in the NSPWP than in the NECS. These results suggest that mesozooplankton biomass both in the NSPWP and in the NECS responded to El $Ni{\tilde{n}}o$ events, although the biological process that explain the reduced mesozooplankton biomass might be different in both regions.

Keywords

References

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