地下河流中的高积累和低效生物放大:来自岩洞生态系统的见解
Chan Li1, Weifeng Du2, Mengyi Chen3
1School of Life Sciences, Guizhou Normal University, Guiyang 550001, China; Institute of International Rivers and Eco-security, Yunnan Key Laboratory of International Rivers and Trans-Boundary Eco-security, Yunnan University, Kunming 650091, China; University of Chinese Academy of Sciences, Beijing 100049, China.
(Hg) 在洞穴生物中大量积累,度高于表面生态系统. 然而,Hg生物放大在这些独特的地下环境中效率较低.
科学领域:
- 环境科学 环境科学
- 生态毒理学 生态毒理学
- 洞穴生物学 洞穴生物学
背景情况:
- 卡斯特洞穴生态系统是独特的,孤立的环境,资源有限,没有光线.
- 这些生态系统中 (Hg) 积累和生物放大动态的理解很少.
- 了解Hg循环对于环境保护和国际公约至关重要.
研究的目的:
- 为了研究总 (THg) 和甲基 (MeHg) 在岩洞穴水生食物网中的生物积累和生物放大.
- 为了比较Hg水平和洞穴生态系统中的热量转移与表面淡水系统.
- 确定影响地下环境中Hg循环的因素.
主要方法:
- 从中国西南的岩洞流中采集水生生物的样本.
- 在组织中量化总 (THg) 和甲基 (MeHg) 度.
- 分析食物网结构和热量关系.
- 计算热量放大斜率 (TMS) 和热量放大因子 (TMF).
主要成果:
- 与表面生态系统相比,洞穴生物的THg和MeHg度显著增加.
- 洞穴中的基底物种显示Hg水平比表面物种高1.5-12.3倍.
- 在洞穴中,Hg生物放大效率较低,TMS和TMF值较低.
- 高积累和低热量转移与洞穴特定的条件和生物体特征有关.
结论:
- 卡斯特洞穴充当了神秘的Hg储库,具有大量的生物积累.
- 独特的洞穴特征 (低光,O2,温度,食物网) 影响Hg循环.
- 这些发现对于准确的Hg库存和在地地形中执行米纳马塔公约至关重要.
更多相关视频
09:38Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems
Published on: October 29, 2016
11:57Ecosystem Fabrication EcoFAB Protocols for The Construction of Laboratory Ecosystems Designed to Study Plant-microbe Interactions
Published on: April 10, 2018
相关概念视频
What is an Ecosystem?
Robbers Cave
The Soil Ecosystem
Stream Function
Freezing Point Depression and Boiling Point Elevation
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
Elevation of Intermediate Points on Vertical Curves
