在不断变化的北极地区频繁的长途植物殖民
Inger Greve Alsos1, Pernille Bronken Eidesen, Dorothee Ehrich
1National Centre for Biosystematics, Natural History Museum, University of Oslo, Post Office Box 1172 Blindern, NO-0318 Oslo, Norway. ingera@unis.no
Science (New York, N.Y.)
|June 16, 2007
概括
尽管气候变化,但物种可以追踪生态. 在北极,植被,而不是分散,限制了植物的分布,这表明未来范围转移预测的无限分散.
科学领域:
- 生态生态学 生态生态学
- 进化生物学 进化生物学
- 遗传学 是一个遗传学.
背景情况:
- 预测气候变化下的物种分布是具有挑战性的,因为在利基追踪中存在不确定性.
- 长距离的分散和定居是影响物种适应不断变化的环境的能力的关键因素.
研究的目的:
- 调查斯瓦尔巴德北极群岛植物物种的殖民历史和遗传多样性.
- 为了确定分散与建立在限制物种在气候变化中的分布方面的相对重要性.
主要方法:
- 用DNA指纹,特别是放大片段长度多态 (AFLP),来分析遗传变异.
- 采集了9种不同的植物物种的样本并进行了分析,以评估它们的殖民模式和遗传关系.
主要成果:
- 确定了来自多个来源地区的植物物种对斯瓦尔巴德的重复远距离殖民.
- 遗传多样性模式与物种的温度要求有很强的相关性,这表明建立是主要的限制.
- 风和海冰可能有助于propagule的分散,从而支持远距离殖民.
结论:
- 建立,而不是分散,是限制北极植物物种分布的主要因素.
- 假设无限分散可能是适当的预测在气候变化下北极生态系统的长期范围的变化.
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