왕우렁이를 이용한 식물플랑크톤 대발생 제어
Control of Phytoplankton Bloom using Apple Snail (Pomacea canaliculata: Ampullariidae)
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초록
This study is measured the change of chlorophyll-a concentration and phytoplanktondensity, the grazing rates (GR) and pseudofaeces production (PFP), by grazing of freshwaterapple snail, Pomacea canaliculata, to investigated that the snails are able to control of phytoplanktonbloom. The experiments are performed to evaluate the GR and PFP at different conditionssuch as incubation time (0, 2, 4, 6, 8, 10 and 12 hr), shell height (1.0 to 4.0 cm, n=108), snaildensity (1, 1.5, 2.5, 3.5 and 5 indiv. L-1) and food concentration (200, 400, 600, 800 and 1000 μg L-1). Regarding feeding time, the highest GR (2.5 L. gAFDW-1 h-1) and PFP (15.3 mg AFDW-1) showedat 4 hr after snail stocking, respectively. The snail, smaller than 1.5 cm in body size, showed thehighest of GRs (2.54 L. gAFDW-1 h-1) for the initial period (2 hr of stocking), compared to thosegreater than 1.5 cm, which showed a stable FR, higher than 0.099 L. gAFDW-1 h-1. Upon snaildensity effect, the density of 5 indiv. L-1 induced the most effective inhibition on phytoplanktonbiomass with the highest PFP. On the food concentration, the highest GR (0.54 L. gAFDW-1 h-1)and PFP (8.5 mg gAFDW-1) were induced at the level of 600 μg L-1, respectively. We checked thatit is possible to control of phytoplankton bloom by the grazing of apple snail as well as Reeve. However, it required a through research for the remove of pseudofaeces and 2nd problem by thedecomposition of the organic materals.
Abstract
This study is measured the change of chlorophyll-a concentration and phytoplanktondensity, the grazing rates (GR) and pseudofaeces production (PFP), by grazing of freshwaterapple snail, Pomacea canaliculata, to investigated that the snails are able to control of phytoplanktonbloom. The experiments are performed to evaluate the GR and PFP at different conditionssuch as incubation time (0, 2, 4, 6, 8, 10 and 12 hr), shell height (1.0 to 4.0 cm, n=108), snaildensity (1, 1.5, 2.5, 3.5 and 5 indiv. L-1) and food concentration (200, 400, 600, 800 and 1000 μg L-1). Regarding feeding time, the highest GR (2.5 L. gAFDW-1 h-1) and PFP (15.3 mg AFDW-1) showedat 4 hr after snail stocking, respectively. The snail, smaller than 1.5 cm in body size, showed thehighest of GRs (2.54 L. gAFDW-1 h-1) for the initial period (2 hr of stocking), compared to thosegreater than 1.5 cm, which showed a stable FR, higher than 0.099 L. gAFDW-1 h-1. Upon snaildensity effect, the density of 5 indiv. L-1 induced the most effective inhibition on phytoplanktonbiomass with the highest PFP. On the food concentration, the highest GR (0.54 L. gAFDW-1 h-1)and PFP (8.5 mg gAFDW-1) were induced at the level of 600 μg L-1, respectively. We checked thatit is possible to control of phytoplankton bloom by the grazing of apple snail as well as Reeve. However, it required a through research for the remove of pseudofaeces and 2nd problem by thedecomposition of the organic materals.
참고문헌 (21)
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