在没有入侵性老鼠的情况下,海鸟提高了珊瑚礁的生产力和功能
Nicholas A J Graham1,2, Shaun K Wilson3,4, Peter Carr5,6
1Lancaster Environment Centre, Lancaster University, Lancaster, UK. nick.graham@lancaster.ac.uk.
Nature
|July 12, 2018
概括
从岛上除掉入侵性老鼠会增加海鸟种群, 这提高了珊瑚礁鱼类的生长,生物质和生态系统功能,
科学领域:
- 海洋生态
- 岛屿生物地理
- 营养循环
背景情况:
- 生物连接转移有机物和营养物质,影响生态系统.
- 海鸟将海洋营养物运到岛上, 提高陆地生产力.
- 这些营养物流对邻近珊瑚礁的影响尚不清楚.
研究的目的:
- 研究海鸟来源的营养补贴如何影响珊瑚礁生态系统.
- 通过自然实验比较查戈斯群岛的老鼠繁殖岛屿和无老鼠岛屿.
主要方法:
- 在没有老鼠的岛屿和感染老鼠的岛屿上比较海鸟密度和沉积.
- 在陆地和珊瑚礁生物中分析的稳定同位素 (δ15N) 值.
- 在相邻的珊瑚礁上测量了鱼类生长,生物量,放牧和生物侵蚀率.
主要成果:
- 没有老鼠的岛屿的海鸟密度和沉积量显著增加.
- 陆地和珊瑚礁生物中的高δ15N值表明在没有老鼠的岛屿上增加了营养补贴.
- 在没有老鼠的岛屿附近的珊瑚礁出现了鱼类生长,生物量,放牧和生物侵蚀的增加.
结论:
- 侵袭性老鼠破坏了海上,岛屿和珊瑚礁生态系统之间的营养流动.
- 根除老鼠对于恢复陆地和海洋生态系统的健康至关重要.
- 恢复海鸟种群可以提高珊瑚礁的生产力和功能.
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