Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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The Effect of Enhanced Nitrate Input on the Temporal Variation of the Plankton Community in a Mesocosm

질산염 첨가에 따른 중형폐쇄생태계 내 플랑크톤 군집의 변화

  • 강정훈 (한국해양연구원 남해연구소) ;
  • 김웅서 (한국해양연구원 해양자원연구본부) ;
  • 신경순 (한국해양연구원 남해연구소) ;
  • 장만 (한국해양연구원 남해연구소) ;
  • 황근춘 (한국해양연구원 남해연구소)
  • Published : 2005.09.30
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Abstract

Temporal variation of the natural planktonic community in the Southern Sea of Korea was investigated by using low floating enclosed bags (3.2m deep and 2,500 liter) in order to understand the effect of enriched nitrate on the planktonic community in the spring (March-April) of 2002. Prior to beginning the incubation, the bags were placed in two different concentrations of nitrate, which consisted of control (ambient water) and experimental mesocosms (final concentration of $12{\mu}M$). The nitrate concentration in the experimental mesocosms remained significantly higher than those in control mesocosms throughout the study period (ANOYA, p<0.001). Following the addition of nitrate, abundance and chi-a concentration of phytoplankton peaked on Day 1, when diatoms established the peak in the experimental mesocosms. Diatoms consisted mainly of Thalasxiosira decipiens, Pseudo-nitzschia pungem, Leptocylindrus danicu, Thalassionema nitzschioides, Chaetoceros pseudocrinitus and Actinoptychus senariu. However, the peak did not lead to the difference in abundance and composition of phytoplankton between control and experimental mesocosms during the study period. The dinoflagellates began to increase soon after the diatoms decreased in all mesocosms. Copepods, as a dominant group in the rnosozooplankton community, showed no immediate peak in relation to the nitrate addition, but only their own developmental process from the eggs to adult stage during the study period. The bottom-up control from enriched nitrate via phytoplankton to adult copepods was not distinguished in terms of the abundance of the planktonic community. This might stem from the relatively low nitrate availability of phytoplankton at no N-limited seawater and the weak coupling between rapidly sunken diatoms and copepods through the water column.

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References

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