수온과 염분의 변화에 따른 연령별 대복 (Gomphina veneriformis: Bivalvia) 의 여과율 변동

The Influence of Water Temperature and Salinity on Filtration Rates of the Hard Clam, Gomphina veneriformis (Bivalvia)

  • 신현출 (전남대학교 해양기술학부) ;
  • 이정호 (전남대학교 해양기술학부) ;
  • 정효진 (전남대학교 해양기술학부) ;
  • 이정식 (전남대학교 수산생명의학과) ;
  • 박정준 (전남대학교 수산생명의학과) ;
  • 김배훈 (전남대학교 해양기술학부)
  • Shin, Hyun-Chool (Faculty of Marine Technology, Chonnam National University) ;
  • Lee, Jung-Ho (Faculty of Marine Technology, Chonnam National University) ;
  • Jeong, Hyo-Jin (Faculty of Marine Technology, Chonnam National University) ;
  • Lee, Jung-Sick (Department of Aqualife Medicine, Chonnam National University) ;
  • Park, Jung-Jun (Department of Aqualife Medicine, Chonnam National University) ;
  • Kim, Bae-Hoon (Faculty of Marine Technology, Chonnam National University)
  • 투고 : 2009.08.03
  • 심사 : 2009.08.19
  • 발행 : 2009.08.31

초록

동해안의 유용 이매패류인 대복 (Gomphina veneriformis; Bivalvia)을 대상으로 기초 생리, 생태적 특성을 파악하기 위해 수온과 염분에 따른 대복의 여과율 변동을 측정하였다. 실험에 사용된 먹이생물은 황색편모조강 Isochrysis galbana (KMCC H-002)를 f/2배지를 이용하여 고농도로 단일배양한 후 사용하였다. 여과율 측정은 간접 측정법을 이용하였고, 실험에 사용된 먹이생물은 광학현미경 하에서 혈구계산판을 이용하여 계수하였다. 수온별 대복의 여과율은 2, 3, 4년생 모두 저온에서 수온이 상승할수록 여과율이 급격히 증가하여 $15^{\circ}C$에서 최대로 나타났으며, 이 후 감소하는 동일한 경향을 보였다. 염분별 대복의 여과율은 2, 3, 4년생 모두 30-35 psu의 염분범위에서 최대로 나타났다. 연령별 대복의 여과율은 수온, 염분변화에 관계없이 2년생 대복이 가장 높은 여과율을 기록했고, 4년생 대복의 여과율이 가장 낮았다. 다항회귀분석 결과 수온별 대복의 여과율 곡선은 모든 연령군에서 대체적으로 저온 구간으로 치우친 경향을 나타내었고 온도계수 $Q_{10}$ 값 역시 저온에서 높게 나타나 저온의 영향을 많이 받는 것으로 나타났다. 염분별 여과율 곡선은 모든 연령군에서 대체적으로 고염 구간으로 치우친 경향이 나타나 저염분으로 갈수록 여과율이 감소한다는 것을 알 수 있었다. 본 연구의 결과로 조하대 부유섭식 이매패류인 대복은 비교적 저온에서 서식하며 넓지 않은 온도범위에서 서식하는 협온성생물이며, 좁은 염분범위에서 높은 여과율을 보이는 협염성종임을 확인할 수 있었다.

The present study was performed to describe the influence of water temperature and salinity on filtration rates of the venus clam, Gomphina veneriformis, a suspension-feeding (filter-feeding) bivalve species. The calmswere collected from the eastern coastal area of Sokcho, Gangneung and Jumunjin at Kangwon-do, Korea, during December 2006 and May 2007. Isochrysis galbana (KMCC H-002) cells as food organisms were indoor-cultured by f/2 medium, and were used to measure the filtration rate of clam. Filtration rates of clam were measured by indirect method. Cell concentration of food organisms were determined by direct counting cells used the hemacytometer under the light microscope. The filtration rates of clams by water temperature sharply increased with temperatures up to $15^{\circ}C$ as optimum temperature and above this temperature, the filtration rates decreased exponentially. Venus clams showed very low filtration rates at low salinity (10-15 psu) and maximum values at high salinity (30-35 psu). Regardless of water temperature and salt change, 2-year class clams showed high filtration rates, but low in 4-year-class. Polynomial regression curves with water temperature were shifted to the left in low temperature region. Thermal coefficient $Q_{10}$ values showed much higher values at low temperature range than at high temperature range, too. These results indicate that the venus clam is more sensitive in cold water. Polynomial regression curves with salinity were shifted to the right in high saline region. According to this study, the venus clam Gomphina veneriformis, subtidal filter-feeding bivalve, was the stenothermal organism, inhabited mainly in low temperature and the stenohaline, in high saline waters.

키워드

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