在120个岛屿的植物和水果种群中,物种的引入更大程度上改变了种子的分散潜力,而不是灭绝
Julia H Heinen1,2, Donald R Drake3, Kim McConkey4
1Center for Macroecology, Evolution and Climate, Globe Institute, University of Copenhagen, Copenhagen 2100, Denmark.
概括
引入和灭绝的脊椎动物正在全球重塑岛屿生态系统,通过改变果动物群体改变种子分散. 这种由引入驱动的功能转变,在动物口大小和植物种子大小之间产生了不匹配,影响了全球生态系统的运作.
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:
- 海洋岛屿的物种灭绝和引入率很高,这大大改变了社区的组成.
- 这些变化可能会破坏关键的生态相互作用,如动物媒介的种子分散,并产生长期的生态系统后果.
- 之前的研究缺乏关于岛屿之间这些功能转变的强度和方向的全球视角.
研究的目的:
- 开展一项全球范围内的综合性研究,研究岛上脊椎动物果食群体的功能重塑.
- 评估由灭绝和引入驱动的果动物特征的变化如何转化为与本地植物物种的不匹配.
- 研究这些功能转变的空间变化和驱动因素及其对种子分散潜力的影响.
主要方法:
- 汇编了来自22个群岛120个岛屿的原生,已灭绝和引入的脊椎动物果食动物 (鸟类,哺乳动物,爬行动物) 的数据.
- 分析了果类特定的特征,重点关注的大小及其与植物种子大小的关系.
- 由于物种的引入和灭绝,果食群体的定量分类学和功能变化.
主要成果:
- 在全球范围内观察到果族社区的广泛功能改造.
- 引入的脊椎动物数量超过了灭绝的脊椎动物数量,在果动物群体中带来了更为显著的功能转变.
- 一个常见的趋势是,无欲的陆地哺乳动物取代了大的飞行果食动物,导致动物的大小和植物种子大小之间的不匹配.
- 引入和灭绝影响的物种和岛屿的比例比以前理解的要高.
- 发现了大量的空间变化和岛屿特有的功能转移,导致种子分散的变化影响.
结论:
- 人类活动,特别是物种引入,正在全球重塑岛屿果群落,改变种子散播潜力.
- 果食动物口大小和植物种子大小之间的功能不匹配对预测生态系统反应构成重大挑战.
- 了解这些复杂的功能转变对于全球岛屿生态系统的有效保护和管理至关重要.
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