• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Effects of low crude oil chronic exposure on the northern krill (Meganyctiphanes norvegica)
【24h】

Effects of low crude oil chronic exposure on the northern krill (Meganyctiphanes norvegica)

机译：低原油长期暴露量对北磷虾（Meganyctiphanes norvegica）的影响

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

Chronic oil pollution related to gas and oil drilling activities is increasing in the sea due to the rising offshore petroleum industry activity. Among marine organisms, zooplankton play a crucial role in the marine ecosystem and therefore understanding the effects of crude oil chronic exposure on zooplankton is needed to determine the impact of oil in marine environments. The present study reports on the effect of crude oil on adult northern krill, Meganyctiphanes norvegica, collected during three seasons. Their sensitivity to oil was examined with oil concentration of 0.01 versus 0.1 mg oil L-1 and photo-modified oil in flowing seawater maintained in the dark for 2 weeks at in situ temperature. Oil (polycyclic aromatic hydrocarbons, PAHs) entered the krill (on average, 350 and 4400 mu g.kg(-1) wet weight in low and medium oil treatments respectively) and a larger fraction of the krill exhibited digestive gland pathologies (enhanced apoptosis and pathology of digestive tubules) in oil treatments (27-80%) compared to a significantly lower fraction (7-13%) in treatments that received no oil. However, 2-week oil exposure at these concentrations did not significantly decrease survivorship or impair basic functioning such as feeding and respiration rates. Similarly, there were only limited changes in the transcription of 7 selected genes from head tissue. Additionally, although there was significant seasonal variation in krill total lipid content and fatty acid composition, there was no treatment effect on both these parameters, which suggests limited oxidative stress under experimental conditions. Furthermore, there was no significant treatment effect on two direct measures of oxidative stress (MDA: malondialdehyde and AOPP: advanced oxidation protein products) in any of the seasons. Nevertheless, histology clearly revealed enhanced digestive gland pathologies in krill even at low concentrations. Although krill with such pathologies continue to survive, their accumulation of PAHs may be transferred up the food chain, impacting their predators and the wider ecosystem.
机译：由于海上石油工业活动的增加，与天然气和石油钻探活动有关的慢性石油污染在海域正在增加。在海洋生物中，浮游动物在海洋生态系统中起着至关重要的作用，因此需要了解原油长期暴露对浮游动物的影响，才能确定石油对海洋环境的影响。本研究报告了原油对三个季节收集的成年北方磷虾（Meganyctiphanes norvegica）的影响。在原位温度下，在黑暗中保持2周的流动海水中，用0.01的油浓度相对于0.1 mg的油L-1和光改性油对油的敏感性进行了检查。油（多环芳烃，PAHs）进入磷虾（在低油和中油处理中，平均湿重分别为350和4400μg.kg（-1）），磷虾的大部分表现出消化腺病理（增强了细胞凋亡）油疗法中的消化管病理学和病理学）（27-80％），相比之下，未加油疗法中的比例（7-13％）显着较低。但是，在这些浓度下接触2周的油不会显着降低存活率或损害基本功能（例如进食和呼吸频率）。同样，从头部组织中选择的7个基因的转录也只有有限的变化。另外，尽管磷虾的总脂质含量和脂肪酸组成存在明显的季节性变化，但对这两个参数均没有治疗作用，这表明在实验条件下氧化应激有限。此外，在任何季节中，对两种直接氧化应激指标（MDA：丙二醛和AOPP：高级氧化蛋白产物）都没有明显的治疗效果。然而，组织学清楚地表明，即使在低浓度下，磷虾的消化腺病理也有所增强。尽管具有这种病态的磷虾继续存在，但其多环芳烃的积累可能在食物链中转移，从而影响了其捕食者和更广泛的生态系统。

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