• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Harmful Algae >Do toxic Pseudo-nitzschia species pose a threat to aquaculture in the southern Benguela eastern boundary upwelling system?
【24h】

Do toxic Pseudo-nitzschia species pose a threat to aquaculture in the southern Benguela eastern boundary upwelling system?

机译：毒性伪奈茨西亚物种对南方南方东区升空系统的水产养殖构成了威胁吗？

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The productive but highly exposed coastline of the southern Benguela eastern boundary upwelling system offers limited natural environment for aquaculture. Saldanha Bay located on the west coast of South Africa is one of the few embayments on the coastline that provides a productive and relatively sheltered environment suitable for the cultivation of shellfish. Consequently, bivalve culture in South Africa is centered in Saldanha Bay and is presently targeted for expansion. Pseudo-nitzschia blooms including toxin-producing species are shown to contribute significantly to the phytoplankton of Saldanha Bay specifically in spring and summer. Their dominance at this time of the year, when upwelling is strongest, fits the ecological profile of Pseudo-nitzschia occurring during periods of high turbulence and nutrients. Multiple Pseudo-nitzschia blooms were sampled under varying envi-ronmental conditions and the strength of the relationship between Pseudo-nitzschia cell abundance and particulate domoic acid (pDA) content, reflecting bloom toxicity, varied greatly. This variability is the result of the combined influence of species and strain composition of the Pseudo-nitzschia assemblage and the effect of environmental conditions on toxin production. Elevated levels of pDA were associated with higher concentrations of cells of the P. seriata complex differentiated by frustule width (3 mu m). P. australis was identified as a toxin-producing species and a prominent member of the P. seriata complex. Low DA levels in shellfish in Saldanha Bay are considered a function of low cellular domoic acid (cDA). Silicate limitation has emerged as an important factor inducing DA production in Pseudo-nitzschia species. The high ratio of silicate to nitrate in Saldanha Bay provides a plausible explanation for the low toxin content of Pseudo-nitzschia blooms in the bay and the consequent low risk posed by these blooms to the aquaculture sector.
机译：南方南方东区边界升空系统的生产但高度暴露的海岸线为水产养殖提供有限的自然环境。 Saldanha Bay位于南非西海岸，是海岸线上的少数倒膜之一，提供了适合贝类培养的生产效率和相对庇护的环境。因此，南非的双气候文化在萨尔达达哈湾定居，目前旨在扩张。包括毒素生产物种在内的伪尼特斯基亚盛开的盛开将在春季和夏季专门针对萨尔达达哈湾的浮游植物作出显着贡献。在今年的这个时候，他们的主导地位是最强的，符合在高湍流和营养期间发生的伪奈茨西亚的生态概况。在不同的环境中，在不同的环境条件下进行了多种伪奈茨西亚绽放，并且伪尼科西氏细胞丰度和颗粒状肠道酸（PDA）含量之间的关系强度，反映绽放毒性，大大变化。这种变异性是伪尼科西氏组合物种和菌株组成的综合影响以及环境条件对毒素生产的影响的结果。 PDA的升高水平与通过截端宽度（>3μm）分化的P.Seriata复合物的较高浓度的细胞。 P. Australis被鉴定为毒素的种类和P.Seriata综合体的突出成员。 Saldanha湾贝类中的低DA水平被认为是低细胞大小肠（CDA）的函数。硅酸盐限制被出现为伪尼氏菌类中诱导达达的重要因素。在萨尔达达海湾硅酸盐与硝酸盐的高比率为海湾伪芽孢杆菌盛开的低毒素含量提供了合理的解释，因此这些绽放到水产养殖领域的随之而来的低风险。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号