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The Strategy of Population Maintenance by Coastal Copepod Inferred from Seasonal Variations in Abundance of Adults and Resting Eggs

연안 요각류의 성체와 휴면란의 계절별 개체수 변화를 통한 개체군 유지 전략

  • Park, Chailinn (Global Ocean Research Center, KIOST) ;
  • Ju, Se-Jong (Global Ocean Research Center, KIOST) ;
  • Park, Wongyu (Department of Marine Biology, Colleges of Fisheries Sciences, Pukyong National University) ;
  • Kim, Hyun-Woo (Department of Marine Biology, Colleges of Fisheries Sciences, Pukyong National University) ;
  • Lee, Soo Rin (Department of Marine Biology, Colleges of Fisheries Sciences, Pukyong National University) ;
  • Park, Jeong-Ho (Fisheries Resources Research Division, National Institute of Fisheries Science)
  • 박채린 (한국해양과학기술원 대양자원연구센터) ;
  • 주세종 (한국해양과학기술원 대양자원연구센터) ;
  • 박원규 (부경대학교 수산과학대학 자원생물학과) ;
  • 김현우 (부경대학교 수산과학대학 자원생물학과) ;
  • 이수린 (부경대학교 수산과학대학 자원생물학과) ;
  • 박정호 (국립수산과학원 연근해자원과)
  • Received : 2018.10.11
  • Accepted : 2018.12.11
  • Published : 2018.12.30

Abstract

We investigated seasonal variations in the abundance of the adults and the resting eggs of copepods to understand the role of copepod resting eggs for maintaining their population inhabiting the coastal area of Dadaepo, Korea. Adults and resting eggs of copepods were collected bi-monthly with a conical net (45 cm mouth diameter, $330{\mu}m$ mesh size) and van Veen grab ($0.1m^2$ area), respectively, from October 2016 to September 2017. The species of resting eggs were identified using mtCOI gene. The mean abundance of copepods was highest in October ($3686{\pm}1190inds{\cdot}m^{-3}$) and lowest in January ($176{\pm}60inds{\cdot}m^{-3}$) with the dominance of Paracalanus parvus s.l.. Among copepod producing resting eggs, Acartia omorii and Centropages abdominalis were dominant. The mean abundance of resting eggs was the highest in July ($9148{\pm}6787eggs{\cdot}m^{-2}$) and the lowest in October ($530{\pm}348eggs{\cdot}m^{-2}$). Most of the collected resting eggs were identified as A. omorii's. The mean abundances of A. omorii adults and resting eggs were highest in July, and both abundances fluctuated in a similar pattern except in September. In September, A. omorii adults were observed in a state of low abundance, while their resting eggs occurred in a state of high abundance. These results suggest that A. omorii maintain their population by producing a large quantity of resting eggs, particularly diapause eggs, before the seawater temperature rises. These eggs would hatch and be newly recruited to their population when the environmental condition becomes favorable.

Keywords

References

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