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A Charecteristics of Marine Environments in a Blood Cockle Farm of the Northwestern Yeoja Bay, Korea. 1. Spatio-temporal Distributions of Chlorophyll a Concentration, Particulate Organic Carbon & Nitrogen

여자만 북서부 꼬막양식어장의 해양환경 특성. 1. 먹이생물로서 Chlorophyll a 농도, 입자태 유기탄소 및 유기질소의 시·공간적 분포 특성

  • Yoon, Yang Ho (School of Marine Technology, Chonnam National University)
  • Received : 2019.05.02
  • Accepted : 2019.07.05
  • Published : 2019.07.31
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Abstract

This study was designed to assess the quality and quantity of food resources such as the chlorophyll a concentration (Chl-a), the particulate organic carbon (POC) and the particulate organic nitrogen (PON), on blood cocke (Tegillarca granosa Linnaeus) farms from May to November 2017 in the northwestern area of Yeoja Bay, Korea. The values of Chl-a, POC and PON were $1.69-7.68{\mu}g{\cdot}L^{-1}$ (average: $3.48{\mu}g{\cdot}L^{-1}$ in the surface), 0.88-2.58 mM (average: 1.97 mM) and 0.17-0.90 mM (average: 0.54 mM), respectively, and these values were higher in the spring and summer and lower in the autumn. Furthermore, Chl-a and POC had higher values on the bottom layer than those vales on the surface, while PON had higher values on the surface than those values on the bottom. The POC/PON ratio and POC/Chl-a ratio were 1.56-7.88 (average: 3.71 on the surface of the water) and 216-967 (average: 700 on the bottom of the water), respectively, with most of the carbon sources being sediment-accumulated particle organic matter, and the contribution by phytoplankton was assessed as being low. These results show that the food source of the blood cockle farms in the northwest area of Yeoja Bay seems to be abundant in quantity, but this is considered to be very poor in quality.

여자만 북서해역에 위치하는 꼬막 양식어장의 해양환경 중 먹이생물 특성을 파악하기 위해 2017년 5월에서 11월까지 계절별로 7개 정점의 표층과 저층을 대상으로 조사를 실시하여, 먹이생물 항목인 Chlorophyll a (Chl-a), 입자태 유기탄소(POC), 입자태 유기질소(PON) 및 POC/PON ratio, POC/Chl-a ratio 등을 분석 및 산출하였다. 결과 Chl-a 농도, POC 및 PON은 각각 $1.69-7.68{\mu}g{\cdot}L^{-1}$(표층 평균 $3.48{\mu}g{\cdot}L^{-1}$), 0.88-2.58 mM(평균 1.97 mM) 및 0.17-0.90 mM(평균 0.54 mM)을 나타내어, 봄과 여름에 높고 가을에 낮은 농도를 보였다. 우점 출현하여, 기존 결과와는 다른 결과를 나타내었다. 수층별로는 Chl-a와 POC는 저층이 표층보다 높았고, PON은 표층이 저층보다 높았다. POC/PON ratio 및 POC/Chl-a ratio는 각각 1.56-7.88 (표층 평균 3.71) 및 216-967 (표층 평균 700)를 나타내어, 탄소원 대부분은 표층퇴적물에 침강 축적된 입자태 유기물로서 식물플랑크톤에 의한 기여부분이 낮은 것으로 평가되었다. 이러한 결과는 여자막 북서해역의 꼬막양식장의 먹이자원은 양적으로는 풍부한 것처럼 보이지만, 질적으로는 매우 불량한 것으로 평가되었다.

Keywords

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Fig. 1. Map show to the bathymetry and sampling stations at the blood cockle farms in the northwestern Yeoja bay.

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Fig. 2. Spatio-temporal variations of chlorophyll a concentration at surface(upper) and bottom(lower) layers in the fishing grounds for blood cockle.

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Fig. 3. Spatio-temporal variations of particulate organic carbon (POC) at surface (upper) and bottom (lower) layers in the fishing grounds for blood cockle.

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Fig. 4. Spatio-temporal variations of particulate organic nitrogen (PON) at surface (upper) and bottom (lower) layers in the fishing grounds for blood cockle.

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Fig. 5. Spatio-temporal variations of POC/PON ratio at surface (upper) and bottom (lower) layers in the fishing grounds for blood cockle.

Table 1. Temporal variations of marine environmental factors in the fishing grounds for blood cockle

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Table 2. A List on the value of particulate organic matters of Korean coastal waters and world regions.

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