ISSN : 1225-3480
본 연구는 먹이생물의 종류와 서식 위치 (패각 크기)에 따라서 지중해담치의 여과율이 수온에 따라 어떻게 변동하는 지를 알아보고자 하였다. 실험에 사용된 먹이생물은 Isochrysis galbana, Chaetoceros didymus and Prorocentrum dentatum의 3 종류이다. 지중해담치의 크기 (각고)는 중부조간대 상부 지역 (+ 5 cm MSL)에 서식하는 개체가 중부조간대 하부지역 (- 58 cm MSL)에 서식하는 개체보다 월등히 작았다. 지중해담치의 여수율과 섭식율은 먹이생물의 종류에 상관없이 중부조간대 상부에 서식하는 지중해담치가 중부조간대 하부에 서식하는 지중해담치보다 높은 값을 보였다. 전반적으로 수온에 따른 여수율과 섭식율 변동은 동일한 변동 양상을 보였다. 즉 수온이 상승함에 따라서 여수율과 섭식율도 증가하다가, 수온 <TEX>$20-25^{\circ}C$</TEX> 정도에서 최대값을 보이며, 이 후 점차 감소하는 경향을 보였다. 다항회귀분석식에서 추정한 최대 여수율과 섭식율을 보이는 이론적 적정 수온 역시 <TEX>$20-25^{\circ}C$</TEX>의 범위내로 나타났다. 먹이생물의 종류에 따라서는 여수율과 섭식율이 약간 다른 변동을 보였다. 대체적으로 여수율과 세포수 기준 섭식율은 지중해담치의 서식위치 (조고)나 먹이생물의 종류에 상관없이 거의 유사한 경향을 보였다. 반면에 탄소함량 기준 섭식율의 경우 먹이생물이 P. dentatum일 경우가 I. galbana나 C. didymus일 경우 보다 월등히 높은 값을 보였다.
This study was performed to describe the influence of temperature on the clearance rate and ingestion rate of the blue mussel, Mytilus galloprovincialis with three food organisms and habitat location (shell size) of mussel. Food organisms used in this experiments were Isochrysis galbana, Chaetoceros didymus and Prorocentrum dentatum. The size of mussels inhabiting higher midlittoral zone was smaller than those of lower midlittoral zone. Regardless of the kind of food organisms, filtration rates and ingestion rates of higher midlittoral mussels were higher than those of lower midlittoral mussels in experiment temperature conditions. The variation of filtration rate and ingestion rate showed same tendency with temperature. Filtration rates and ingestion rates increased with temperature, and recorded maximum values at 20-25℃ of temperature, and thereafter decreased gradually. Theoretical optimum temperatures showing maximum filtration rates and ingestion rates estimated from polynomial regression curves were also in the range of 20-25℃. Blue mussels showed different variation of filtration rate and ingestion rate with the kind of food organisms. Filtration rates and ingestion rate based on cell number were similar regardless of habitat location(tidal elevation) and food organisms. Ingestion rates based on carbon content showed very high values in case of P. dentatum beside I. galbana and C. didymus as food organism.
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