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Long-term variation of zooplankton around Dokdo in the East Sea

독도 인근해역 동물플랑크톤 장기간 특성

  • Kang, Jung-Hoon (South Sea Environment Research Center, Korea Institute of Ocean Science & Technology) ;
  • Kim, Woong-Seo (Deep-Sea and Seabed Mineral Resources Research Center, Korea Institute of Ocean Science & Technology) ;
  • Kwon, Oh Youn (South Sea Environment Research Center, Korea Institute of Ocean Science & Technology) ;
  • Cho, Kyuhee (Envient incorporation)
  • 강정훈 (한국해양과학기술원 남해특성연구센터) ;
  • 김웅서 (한국해양과학기술원 심해저광물자원연구센터) ;
  • 권오윤 (한국해양과학기술원 남해특성연구센터) ;
  • 조규희 ((주)엔비언트)
  • Received : 2016.08.03
  • Accepted : 2016.09.09
  • Published : 2016.09.30

Abstract

We investigated the abundance and composition of the zooplankton community around Dokdo in the East Sea from 2006 to 2015. Zooplankton samples were collected in the surface mixed layer by vertical hauls using a standard type net at the monitoring stations. There were no clear long-term trends in the average temperature and salinity, but relatively low salinity was recorded in the summer of 2013 and 2015. The average abundances of zooplankton in the summer increased by two orders of magnitude from $317inds./m^3$ in 2008 to $10,242inds./m^3$ in 2015. This long-term increase was accompanied by a slight increase in the chlorophyll-a concentration and a decrease in the catch of potential crucial predators (anchovy, mackerel pike, squid, herring and horse mackerel) in the study area. The dominant zooplankton, accounting for most of the long-term increase, consisted of appendicularian (Oikopleura spp.), which showed a steady increase since 2012, summer species such as Noctiluca scintillans and the cladoceran Penilia avirostris, which showed an abrupt increase, and the copepod Paracalanus parvus s.l., which showed a rapid increase after its first occurrence in summer 2010. These results suggest that the long-term increase of zooplankton could be related to the increase in the concentration of prey and the decrease in the predation pressure of potential predators around Dokdo in the study area.

2006년부터 2015년까지 동해 독도 인근해역에서 동물플랑크톤 군집의 변동특성을 조사하였다. 동물플랑크톤 시료는 고정정점의 수온약층 상부수층에서 표준네트로 수직예인하여 획득하였다. 평균수온과 염분은 장기적으로 뚜렷한 변화는 없었으나, 2013년과 2015년 여름철에 상대적으로 낮은 염분이 관측되었다. 동물플랑크톤 평균 개체수는 여름철 기준으로 $317inds./m^3$(2008년)부터 $10,242inds./m^3$(2015년)까지 증가추세를 나타냈고, 동물플랑크톤 장기간 증가는 먹이생물인 엽록소-a 농도 증가와 잠재적 포식자인 주요 어류(멸치, 꽁치, 오징어, 청어, 전갱이)의 어획생산량 감소와 같이 나타났다. 증가를 주도한 우점종은 점진적으로 증가하는 유형류(Oikopleura spp.), 여름철에 주로 출현하며 2012년 이후 급속히 증가한 야광충(Noctiluca scintillans)과 지각류(Penilia avirostris), 그리고 2010년 여름철에 출현하기 시작하여 빠른 속도로 증가한 요각류(Paracalanus parvus s.l.)로 구분되었다. 본 연구결과는 독도주변해역에서 장기간 증가한 동물플랑크톤 개체수가 먹이농도의 증가와 상위포식자의 포식압 감소와 관련있음을 시사하였다.

Keywords

References

  1. J.-Y. Na, S.-W. Lee, K.-D. Cho, A study on sea water and ocean current in the sea adjacent to Korea Peninsula, Journal of the Korean Fisheries Society, vol. 24, no. 4, pp. 215-228, 1991.
  2. H.-S. Yang, S.-S. Kim, C.-G. Kang, K.-D. Cho, A study on sea water and ocean current in the sea adjacent to Korea peninsula, Journal of the Korean Fisheries Society, vol. 24, no. 3, pp. 185-192, 1991.
  3. C. Park, C.R. Lee, J.C.Kim, Zooplankton community in the front zone of the East Sea (the Sea of Japan), Korea: 2. Relationship between abundance distribution and seawater temperature, Journal of Korean Fisheries Society, vol. 31, no. 5, pp. 749-759, 1998.
  4. Dokdo Ocean and Fisheries Association, The report on the basic study for sustainment of marine environment and fishery resources of the Tokto Area, Ministry of Maritime Affairs and Fisheries, Korea, 544p, 1999.
  5. Korea Ocean Research & Development Institute, The report on a study on the basic exploration for Dokdo ecosystem, Ministry of Maritime Affairs and Fisheries, Korea, 1,033p, 2000.
  6. Korea Ocean Research & Development Institute, The report on a sustainable research and development of Dokdo, Ministry of Land, Transport and Maritime Affairs, Korea, 792p, 2008.
  7. J.-H. Kang, W.-S. Kim, K.-I. Chang, J.-H. Noh, Distribution of plankton related to the mesoscale physical structure within the surface mixed layer in the southwestern East Sea, Korea, Journal of Plankton Research, vol. 26, no. 12, pp. 1515-1528, 2004. DOI: http://dx.doi.org/10.1093/plankt/fbh140
  8. S.W. Kim, C.I. Choi, K.I. Yoo, Observations on the biology of a marine cladoceran Evadne spinifera in waters adjacent to Ulleung Do and Tok Do Islands in the East Sea, Korea, Korean Journal of Environmental Biology, vol. 14, no. 2, pp. 189-193, 1996.
  9. J.-H. Kang, W.-S. Kim, J.-H. Shim, Species composition and abundance of zooplankton community in Spring and Autumn around Dokdo, Ocean and Polar Research, vol. 24, no. 4, pp. 407-417, 2002. DOI: http://dx.doi.org/10.4217/OPR.2002.24.4.407
  10. H.-W. Lee, W.-G. Park, Larval timing and distribution of the red snow crab Chionoecetes japonicus near Dokdo, Korean Journal of Fisheries and Aquatic Sciences, vol. 45, no. 6, pp. 716-722, 2012. DOI: http://dx.doi.org/10.5657/KFAS.2012.0716
  11. C. Park, J.K. Choi, Zooplankton community in the front zone of the East Sea of Korea (the Sea of Japan): 1. Species list, distribution of dominant taxa, and species association, Journal of Korean Fisheries Society, vol. 30, no. 2, pp. 225-238, 1997.
  12. J.-H. Kang, M.H. Seo, O.Y. Kwon, W.-S. Kim, Diel vertical migration of the copepod Calanus sinicus before and during formation of the Yellow Sea Cold Bottom Water in the Yellow Sea, Acta Oceanologica Sinica. vol. 32, no. 9, pp. 99-106, 2013. DOI: http://dx.doi.org/10.1007/s13131-013-0357-6
  13. D. Roemmich, J. McGowan, Climate warming and the decline of zooplankton in the California current, Science, vol. 267, pp. 1324-1326, 1995. DOI: http://dx.doi.org/10.1126/science.267.5202.1324
  14. H.M. Verheye, A.J. Richardson, Long-term increase in crustacean zooplankton abundance in the southern Benguela upwelling region (1951-1996): bottom-up or top-down control?, ICES Journal of Marine Science, vol. 55, pp. 803-807, 1998. DOI: http://dx.doi.org/10.1006/jmsc.1998.0387
  15. J. Flinkman, E. Aro, I.Vuorinen, M.Viitasalo, Changes in northern Baltic zooplankton and herring nutrition from 1980s to 1990s: top-down and bottom-up processes at work, Marine Ecological Progress Series, vol. 165, pp. 127-136, 1998. DOI: http://dx.doi.org/10.3354/meps165127
  16. C. Mollmann, G. Kornilovs, L. Sidrevics, Long-term dynamics of main mesozooplankton species in the central Baltic Sea, Journal of Plankton Research, vol. 22, no. 11, pp. 2015-2038, 2000. DOI: http://dx.doi.org/10.1093/plankt/22.11.2015
  17. R.A. Clark, C.L.J. Frid, K.R. Nicholas, Long-term, predation-based control of a central-west North Sea zooplankton community, ICES Journal of Marine Science, vol. 60, pp.187-197, 2003. DOI: http://dx.doi.org/10.1016/S1054-3139(02)00253-9
  18. C. Lin, J. Su, B. Xu, Q. Tang, Long-term variations of temperature and salinity of the Bohai Sea and their influence on its ecosystem, Progress in Oceanography, vol. 49, pp. 7-19, 2001. DOI: http://dx.doi.org/10.1016/S0079-6611(01)00013-1
  19. J.-H. Kang, W.-S. Kim, H.J. Jeong, K.Shin, M.Chang, Why did the copepod Calanus sinicus increase during the 1990s in the Yellow Sea?, Marine Environmental Research, vol. 63, pp. 82-90, 2007. DOI: http://dx.doi.org/10.1016/j.marenvres.2006.05.005
  20. J.-H. Kang, Distributional characteristics and carrying capacity of the potentially risky species Noctiluca scintillans at international Korean seaports, Ocean and Polar Research, vol. 32, no. 4, pp. 449-462, 2010. DOI: http://dx.doi.org/10.4217/OPR.2010.32.4.449
  21. J.H. Lochhead, On the distribution of a marine cladoceran, Penilia avirostris DANA (Crustacea, Branchiopoda), with a note on its reported bioluminescence, Biological Bulletin, vol. 107, no. 1, pp. 92-105, 1954. DOI: http://dx.doi.org/10.2307/1538633
  22. S.I. Uye, S. Ichino, Seasonal variations in abundance, size composition, biomass and production rate of Oikopleura dioica(Fol)(Tunicata: Appendicularia) in a temperate eutrophic inlet, Journal of Experimental Marine Biology and Ecology, vol. 189, pp. 1-11, 1995. DOI: http://dx.doi.org/10.1016/0022-0981(95)00004-B
  23. F. Sommer, T. Hansen, H. Feuchtmayr, B. Santer, N. Tokle, U. Sommer, Do calanoid copepods suppress appendicularians in the coastal ocean?, Journal of Plankton Research, vol. 25, no. 7, pp. 869-871, 2003. DOI: http://dx.doi.org/10.1093/plankt/25.7.869
  24. A. Lopez-Urrutia, R.P. Harris, T.Smith, Predation by calanoid copepods on the appendicularian Oikopleura dioica, Limnology and Oceanography, vol. 49, no. 1, pp. 303-307, 2004. DOI: http://dx.doi.org/10.4319/lo.2004.49.1.0303
  25. S.Y. Moon, H.-J. Oh, H.Y. Soh, Seasonal variation of zooplankton communities in the southern coastal waters of Korea, Ocean Polar Research, vol. 32, no. 4, pp. 411-426, 2010. DOI: http://dx.doi.org/10.4217/OPR.2010.32.4.411
  26. K. Suzuki, Y. Nakamura, J. Hiromi, Feeding by the small calanoid copepod Paracalanus sp. on heterotrophic dinoflagellates and ciliates, Aquatic Microbial Ecology, vol. 17, pp. 99-103, 1999. DOI: http://dx.doi.org/10.3354/ame017099
  27. R. Giesecke, H.E. Gonzalez, Reproduction and feeding of Sagitta enflata in the Humboldt Current system off Chile, ICES Journal of Marine Science, vol. 65, pp. 361-370, 2008. DOI: http://dx.doi.org/10.1093/icesjms/fsn030