塞斯顿中的不和脂肪酸含量和湖泊中的 trofodynamic 合
Dörthe C Müller-Navarra1, Michael T Brett, Sangkyu Park
1University of California, Department of Environmental Science and Policy, One Shields Avenue, Davis, California 95616, USA. doerthe.mueller-navarra@uni-hamburg.de
Nature
|January 1, 2004
概括
湖泊的营养物质负载影响食物网的能量转移. 塞斯顿中的特定omega-3脂肪酸 (omega3-PUFA) 随着高的含量而减少,这解释了动物浮游生物的减少和更高的营养水平.
科学领域:
- 生态生态学 生态生态学
- 临界技术 临界技术
- 生物地质化学生物地质化学
背景情况:
- 营养物质负载,特别是总,是湖水质量管理的关键因素.
- 营养负载和浮游植物 (叶绿素a) 之间的关系已经确立,但影响食物网能量转移的机制尚不清楚.
- 随着营养负载和生产率的增加,将能量转移效率降低到更高的热量级.
研究的目的:
- 为了研究湖中特定的omega-3多不和脂肪酸 (omega3-PUFA) 的作用.
- 为了确定omega3-PUFA含量与湖泊 trofhic状态 (总) 之间的相关性.
- 通过植物动物界面的食物质量来解释生产性湖泊中能量转移效率的下降.
主要方法:
- 在夏季对塞斯顿成分的分析.
- 特定的欧米茄3-PUFA的量化,包括八甲乙烯酸,埃可萨乙烯酸 (EPA),多可萨乙烯酸和α-烯酸.
- 将经验EPA-to-carbon数据与动物浮游生物 (Daphnia) 生长和蛋生产的功能模型集成.
主要成果:
- 塞斯顿中的特定omega3-PUFA与湖泊的热带状态有显著的相关性.
- 随着总含量的增加,埃可萨氨酸 (EPA),多可萨赫萨氨酸和八甲氨酸的含量都在减少.
- 阿尔法-烯酸与总没有显著的相关性.
结论:
- 降低塞斯顿的omega3-PUFA含量,同时增加营养负载,降低了动物浮游生物的食物质量.
- 植物动物界面上的食物质量下降解释了能量转移到生产性湖泊中更高的食物水平的效率下降.
- 欧米茄3-PUFA含量是对营养丰富的反应中介于食物网动态的关键因素.
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