隐藏在肠道中:转基因编码揭示了被忽视的入侵性欧洲鱼 (Silurus glanis) 的掠食行为
Mafalda Moncada1,2, Sofia Nogueira1, Diogo Ribeiro1
1MARE, Marine and Environmental Sciences Centre/ARNET, Aquatic Research Network, Faculty of Sciences, University of Lisbon, Lisbon, Portugal.
Journal of fish biology
|August 20, 2025
概括
对欧洲鱼 (Silurus glanis) 饮食的元编码分析显示,捕食物比传统方法多样化. 这种先进的技术对于了解对本地物种的影响以及为伊比利亚半岛的保护工作提供信息至关重要.
科学领域:
- 生态学
- 水生生物学
- 保护科学
背景情况:
- 欧洲鱼 (Silurus glanis) 是伊比利亚半岛的一个入侵物种.
- 了解入侵性捕食者的饮食对于评估它们对生态的影响至关重要.
- 传统的形态分析在全面识别猎物方面存在局限性.
研究的目的:
- 为了比较metabarcoding和形态分析在欧洲入侵性鱼的饮食的有效性.
- 在伊比利亚半岛确定Silurus glanis的猎物组成和多样性.
- 通过入侵性掠食者威胁本地物种的保护策略.
主要方法:
- 使用环境DNA元编码对173条欧洲鱼的肠道内容进行分析.
- 通过传统的形态识别对110只欧洲鱼的胃部内容进行分析.
- 通过这两种方法检测到的猎物类型的比较,包括鱼类和甲类动物.
主要成果:
- 甲基编码发现了明显更多的猎物种类 (34) 比形态分析 (21).
- 这两种方法都确定了关键的本地猎物 (例如,Anguilla anguilla) 和非本地猎物.
- 与形态分析相比,metabarcoding检测到了危物种,并显示了A. anguilla的更高的掠食率.
结论:
- 通过metabarcoding,可以更全面地评估Silurus glanis的饮食,特别是鱼类.
- 观察到饮食变化,受季节和捕食者大小的影响,表明适应性食.
- 这些发现突显了迫切需要采取管理行动,以减轻侵入性鱼对伊比利亚水生生态系统的影响.
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