한국수산과학회지 (Korean Journal of Fisheries and Aquatic Sciences)

  • 제38권1호
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  • Pages.55-64
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  • 2005
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  • 0374-8111(pISSN)
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  • 2287-8815(eISSN)
한국수산과학회 (The Korean Society of Fisheries and Aquatic Science)
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남대천 하구역의 식물플랑크톤과 영양염 변동

Variation of Phytoplankton and Nutrients in the Namdaechon Estuary, Korea

  • 권기영 (국립수산과학원 남해수산연구소) ;
  • 김주경 (국립수산과학원 동해수산연구소) ;
  • 홍관의 (국립수산과학원 내수면생태연구소) ;
  • 성기백 (국립수산과학원 남해수산연구소) ;
  • 이철호 (국립수산과학원 동해수산연구소) ;
  • 문창호 (국립수산과학원 동해수산연구소, 부경대학교 해양학과)
  • KWON Kee-Young (South Sea Fisheries Research Institute, NFRDI) ;
  • KIM Ju-Kyoung (East Sea Fisheries Research Institute, NFRDI) ;
  • HONG Gwan-Eui (Inland Fisheries Ecological Research Institute, NFRDI) ;
  • SEONG Ki-Baek (South Sea Fisheries Research Institute, NFRDI) ;
  • LEE Chul-Ho (East Sea Fisheries Research Institute, NFRDI) ;
  • MOON Chang-Ho (East Sea Fisheries Research Institute, NFRDI, Department of Oceanography, Pukyong National University)
  • 발행 : 2005.02.01
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초록

Spatio-temporal variations of phytoplankton abundance and nutrient concentrations were investigated in the Namdaechon estuary, Yangyang, from April to December, 2003. A total of 51 phytoplankton species were identified with 32 diatom species in the study area. Phytoplankton abundance ranged from 14 cells/mL to 3,798 cells/mL. Small sized benthic and pennate-type diatoms like Cymbella spp., Fragilaria spp., Navicula spp., Synedra spp. were dominant at throughout the whole study area. Various planktonic species like Chlamydomonas sp., Peridinium spp., Euglena spp., Cryptomonas spp. etc. were abundant especially at the estuary of the Namdaechon, from May to August. Phytoplankton bloom (>3,000 \;cells/mL) occurred from the late May to mid June. After September when the sandbank of estuary was broken by the typhoon 'Maemi', planktonic species disappeared. These planktonic species were followed by oceanic diatoms, Skeletonema costatum and Chaetoceros spp.. Concentrations of dissolved inorganic nitrogen (DIN) and silicate were relatively high at the upstream in summer. In May, before phytoplankton bloom, high concentrations of phosphate $(>3.5\;{\mu}mol/L)$ were observed at all the study area. These results suggested that spatio-temporal variation of phytoplankton in the Namdaechon estuary was related to formation of sandbank at the mouth of the estuary, fluid speed affected by sandbank and nutrients supplied in spring. High correlation $(r^2=0.928)$ between chlorophyll a and biological oxygen demand (BOD) implies that BOD was related to phytoplankton abundance in the Namdaechon estuary.

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