不断变化的环境条件改变了两个关键的北极海洋捕食者的食生态
Matthew A Anderson1, Aaron T Fisk1, Rodd Laing2
1School of the Environment, University of Windsor, Windsor, ON, Canada.
Scientific reports
|August 28, 2023
概括
北极海和环状海正在改变他们的饮食,以应对环境变化. 这些变化会影响食物网的动态,并可能影响拉布拉多的因纽特人的粮食安全.
科学领域:
- 海洋生态海洋生态学
- 北极地区的食物网.
- 气候变化影响气候变化的影响.
背景情况:
- 北极海洋食物网对环境变化非常敏感.
- 北极 (Salvelinus alpinus) 和环状海 (Pusa hispida) 是监测生态系统健康的关键物种.
- 了解它们的养生态,可以了解北极地区的气候变化影响.
研究的目的:
- 调查海冰,海面温度 (SST) 和初级生产力如何影响北极和环状海的养生态.
- 评估加拿大拉布拉多北部这些关键物种的长期饮食变化.
- 评估这些饮食变化对北极食物网和区域粮食安全的影响.
主要方法:
- 稳定同位素分析 (δ13C, δ15N, δ34S) 以追踪饮食来源和热量水平.
- 分析长期环境数据 (海冰,SST,叶绿素a).
- 同位素数据与环境变量和物种状况因素的相关性.
主要成果:
- 北极煤炭转移到更高的热带水位和更多的海洋/海上资源,这与叶绿素a的减少有关.
- 环状海也在更多的海底资源上移动到更高的食量水平,与较低的SST和更高的叶绿素a相关.
- 高SST和减少的海冰导致更大的同位素位大小,这表明两种物种的食变化更大.
- 北极碳状况降低和脂质含量与更高的摄食位相关.
结论:
- 环境变化正在推动北极海和环状海的养生态发生重大变化.
- 这些饮食变化对北极海洋食物网的结构有影响.
- 这些在文化和生态上重要的物种的数量和分布的变化可能会威胁到拉布拉多的因纽特人的粮食安全.
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