Primary production mechanism in a bay with cultivation of pearl oyster Pinctada fucata martensi (Dunker)

海湾养殖珍珠贝的初级生产机制 Pinctada fucata martensi (Dunker)

• 批准号: 06640819
• 负责人: KAWABATA Zenichiro
• 金额: $ 0.45万
• 依托单位: Ehime University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06640819/
• 关键词: Pearl oyster Pinctada fucata martensi (Dunker); Phytoplankton; Predation; Filtrated sea water; Pump up mechanism; Mitigation effect; Bay; 濾過海水; 栄養塩; 増殖物質; 連鎖; 貝重

The object of this study was to clarify the primary production mechanism in the bay where pearl oysters Pinctada fucata martensi (Dunker) were cultivated. The results obtained were as follows : 1) the amount of predation of P.fucata martensi on phytoplankton in summer was 0.11 mug/hr/g of wet weight, 2) P.fucata martensi filtrated 171/hr/individual (43g) of sea water in summer, 3) 0.5 mug/l of chlorophyll a increased with the Kyucho in the bay, 4) a mitigation hypothesis, that P.fucata martensi indirectly favored the growth of phytoplankton by filtrating sea water, was induced based on the comparison of the increase by the pump up mechanism and the decrease by predation of P.fucata martensi predation, 5) the concentrations of P04-P and NH4-N increased in the filtrated sea water, 6) growth substances existed in the filtrated sea water by P.fucata martensi.It was found that while P.fucata martensi favored the growth of phytoplankton in the bay it also hindered its growth by its predation. This is a mitigation effect of P.fucata martensi on its predation on phytoplankton.These results indicated an important prey-predatory relationship in an aquatic ecosystem.

本研究旨在探讨合浦珠母贝（Pinctada fucata martensi（Dunker））养殖湾的初级生产机制。获得的结果如下：1）夏季合浦裸腹蛛对浮游植物的捕食量为0.11 μ g/hr/g湿重，2）夏季合浦裸腹蛛对海水的滤食量为171 μ g/hr/个体（43 g），3）海湾中的Kyucho增加了0.5 μ g/l叶绿素a，4）缓解假说，通过比较合浦原鲤捕食作用的泵升机制和捕食作用的降低机制，得出合浦原鲤通过过滤海水间接促进了浮游植物的生长; 5）过滤海水中P_（04）-P和NH_（4-N）浓度增加，（6）合浦裸藻滤出的海水中存在生长物质，合浦裸藻在促进海湾浮游植物生长的同时，也通过捕食作用阻碍了浮游植物的生长。这是合浦藻对浮游植物捕食的一种缓解作用，表明了水生生态系统中重要的捕食-捕食关系。