Journal of Ecology and Environment

한국생태학회 (The Ecological Society of Korea)
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A Laboratory Study of the Effect of Phytoplankton Concentration, Water Flow and Their Interaction on the Growth of the Sandy Shore Suspension Feeding Clam Gafrarium tumidum

  • Shin, P.K.S. (Department of Biology and Chemistry, City University of Hong Kong) ;
  • Cheung, S.G. (Department of Biology and Chemistry, City University of Hong Kong)
  • 발행 : 2007.05.31
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초록

The effects of water flow rate and phytoplankton concentration on the growth of the sandy shore clam Gafrarium tumidum was investigated in a laboratory flume study using a $3{\times}3$ factorial design. After 60 days, shell length, shell weight and tissue dry weight increased significantly with phytoplankton concentration. For the effect of flow rate, growth was faster when flow rate increased from low to medium level; further increases in flow rate, however, either did not sustain faster growth or resulted in a reduction in growth. The condition index (CI) of a standard-sized clam was significantly higher at low flow rate than at medium and high flow rates and was negatively correlated with phytoplankton concentration. The uncoupled growth of shell and tissue in response to flow rate and phytoplankton concentration may be adaptations to low food environments, so that energy can either be stored to sustain life or reserved for gametogenesis during the reproductive period.

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참고문헌

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