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ISSN : 2287-8327

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Vol.30 No.2
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Growth Responses of the Filter-Feeding Clam Gafrarium tumidum to Water Flow: A Field Manipulation Experiment

Journal of Ecology and Environment / Journal of Ecology and Environment, (P)2287-8327; (E)2288-1220
2007, v.30 no.2, pp.109-119
Cheung, S.G (City University of Hong Kong, Kowloon)
Paul K.S. Shin (City University of Hong Kong, Kowloon)
Cheung,, S. , & Paul, K. S. (2007). Growth Responses of the Filter-Feeding Clam Gafrarium tumidum to Water Flow: A Field Manipulation Experiment. Journal of Ecology and Environment, 30(2), 109-119.
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Abstract

The effect of water flow on the growth of Gafrarium tumidum was studied in the field using open cages constructed with stainless steel net and perspex in which holes were drilled. Cages with different flows (25, 50 and 75% of the control) were made by varying the area of perspex being drilled. Reduction in flow rate was directly proportional to the undrilled area, and the mean flow rate of the different treatment groups varied from 3.12 cm/s for the 25% exposure to 12.48 cm/s for the control cages. At the end of the 3-month experiment, no significant differences in sediment characteristics were found among the treatments. Growth in shell length, shell weight and tissue dry weight was, however, positively correlated with flow rate. Percentage increases ranged from 3.0～8.3% for shell length, 9.9～23.1% for shell weight and 17.2～53.3% for tissue dry weight. Condition index of the clam was not significantly different among the treatments. Seston depletion effect could reduce growth in G. tumidum only when water flow was reduced to 25% of the control. G. tumidum also exhibited different responses in shell and tissue growth at low flow rates, in which shell growth continued to decrease as flow rate decreased whereas tissue growth was relatively independent of low flows at 25 and 50% of the control. It was suggested that when seston flux was reduced at slow flows, it would be a better strategy for G. tumidum to channel energy for gonad development instead of shell growth during the reproductive stage.

keywords
Clams, Gafrarium, Growth, Water flowCheung, S.G. and Paul K.S. Shin J. Ecol. Field Biol. 30 (2) 110Here we describe the results of a study investigating the growth of a siphonate, filter-feeding clam Gafrarium tumidum under dif-ferent flow rates in, Clams, Gafrarium, Growth, Water flowCheung, S.G. and Paul K.S. Shin J. Ecol. Field Biol. 30 (2) 110Here we describe the results of a study investigating the growth of a siphonate, filter-feeding clam Gafrarium tumidum under dif-ferent flow rates in

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(2007) Received February 5 2007 Accepted February 24 2007,

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