Caprella watch : new approach for monitoring butyltin levels in the shallow water ecosystem

Caprella 观察：监测浅水生态系统中丁基锡水平的新方法

基本信息

批准号：
09680503
负责人：
TAKEUCHI Ichiro
金额：
$ 1.98万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

The wide impact of tributyltin (TBT) on non-target organisms has led several developed countries to place restrictions on the use of TBT as an antifouling agent for coastal boats and aquaculture beds. A comparative study on the butyltin levels in various organisms showed that marked bioaccumulation occurs in certain lower trophic levels ; i.e., from seawater to phytoplankton and into caprellid amphipods, Caprella spp. Caprella spp., which inhabit algal communities and aquaculture beds in the subtidal zone, are small crustaceans with reduced movement ability and a shortened life-span of less than 3 months. These characteristics indicate that Caprella spp. may be well-suited for monitoring butyltin residue changes over small spatial and temporal scales. Thus, we propose the suitability of using Caprella spp. to monitor temporal and spatial changes in baseline concentrations of butyltins. We compared the acute toxicity of caprellid and gammarid amphipods, both collected from the shallow water ecosystem of Otuschi Bay. The results show LCィイD250ィエD2 at 20℃ after 2 days of caprellids in 1.2-6.6 mg TBT/L are significantly lower than gammarids in 17.8-23.1 mg TBT/L. We have collected Caprella spp. from various areas along Japanese coasts since 1997. The preliminary results on the BTs (TBT, DBT and MBT) indicate that BTs vary from 1 ng/g wet weight in C. penantis R-type from Tobishima Island in the Sea of Japan to 466 ng/g wet weight in C. decipiens from Amakusa Islands, western Kyushu. This indicates that the difference of BTs in Caprella spp. is in the range of at least 500 times along Japanese coasts. The above results indicate that Caprella watch is a useful approach for monitoring butyltin residues in the shallow water ecosystem.

三丁基锡 (TBT) 对非目标生物体的广泛影响导致一些发达国家限制使用 TBT 作为沿海船只和水产养殖床的防污剂。生物蓄积发生在某些较低的营养级，即从海水到浮游植物，再到 Caprella spp.。栖息在潮下带的藻类群落和水产养殖床中，是小型甲壳类动物，运动能力较差，寿命短于 3 个月，这些特征表明 Caprella spp 可能非常适合监测小范围内的丁基锡残留变化。因此，我们提出使用 Caprella spp 监测丁基锡基线浓度的时间和空间变化的适用性。结果显示，在 1.2-6.6 mg TBT/L 条件下，在 20℃ 下的 LC250D2 显着低于在 17.8-23.1 mg TBT/L 条件下的蛤蟆。自 1997 年以来，从日本沿海的各个地区采集了 Caprella spp.。 BT（TBT、DBT 和 MBT）表明 BT 范围从日本海飞岛的 C. penantis R-type 湿重 1 ng/g 到天草群岛 C. decipiens 的 466 ng/g 湿重, 九州西部这表明日本沿海地区的 BT 差异至少为 500 倍。 Caprella 监测是监测浅水生态系统中丁基锡残留量的有用方法。