植物入侵导致了加拉帕戈斯群岛云林中达尔文的养模式的改变
Rebecca Hood-Nowotny1, Ingrid Rabitsch1, Arno Cimadom2
1Institute of Soil Research, University of Natural Resources and Life Sciences, 1180 Vienna, Austria.
The Science of the total environment
|June 26, 2023
概括
加拉帕戈斯群岛的侵入性黑通过降低它们的食物来源来伤害本地. 长期管理有助于森林恢复,并支持鱼种群.
科学领域:
- 生态生态学 生态生态学
- 保护生物学 保护生物学
- 岛屿生物地理 岛屿生物地理
背景情况:
- 侵入性物种,如Rubus niveus (黑),威胁着岛上的生物多样性.
- 加拉帕戈斯云林和特有达尔文特别容易受到入侵植物的影响.
- 来自入侵植物的食物网中断可能会影响本土动物群,包括食虫鸟类.
研究的目的:
- 为了研究侵入性黑对绿色 (Certhidae olivacea) 的饮食和食物网的影响.
- 为了比较未经管理的,短期和长期入侵性植物管理地区的鱼的饮食变化.
- 评估入侵物种管理对生态系统恢复和鸟类种群的有效性.
主要方法:
- 在鸟类血液和关节动物食物来源中进行稳定同位素分析 (δ15N,δ13C,C:N比率).
- 在被侵占和管理的地区评估关节动物的丰富性和多样性.
- 使用同位素混合模型进行饮食表征.
主要成果:
- 在未经管理的,黑入侵地区的鱼消耗了更多的,但质量较低的节肢动物.
- 侵入性黑侵占降低了食物来源质量,对子生理学产生了负面影响.
- 短期黑控制暂时减少了食物的可用性,影响了的招募.
结论:
- 侵入性黑会显著改变食物网,对加拉帕戈斯鱼种群产生负面影响.
- 长期的入侵物种管理促进生态系统的恢复,并支持在三年内恢复本土鸟类种群.
- 保护战略必须考虑入侵物种对食物网动态和本土生物多样性的级联影响.
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