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Sci Rep:中科院水生所蔡庆华研究组发表于高山溪流群落构建过程研究进展

摘要 : 2016年4月19日,国际学术权威刊物自然出版集团旗下子刊《Scientific Reports》在线发表了中国科学院水生生物研究所系统与流域生态学学科组蔡庆华研究员对高山溪流底栖硅藻集合群落构建过程的研究进展

2016年4月19日,国际学术权威刊物自然出版集团旗下子刊《Scientific Reports》在线发表了中国科学院水生生物研究所系统与流域生态学学科组蔡庆华研究员对高山溪流底栖硅藻集合群落构建过程的研究进展,博士生董笑语为论文第一作者,蔡庆华研究员为论文通讯作者。

中国西南山地典型的地形地貌造成了丰富的生物多样性资源和独特的生物多样性格局,因而被保护国际 (Conservation International,简称 CI)列为全球34个生物多样性热点地区之一。研究区域内典型高山生物群落的构建和维持机理对该区域生物多样性的研究和保护具有重要意义。

研究工作开展于滇西北地区的苍山溪流,运用空间模型模拟底栖硅藻的扩散过程,结果表明高山溪流中方向性的生态过程是群落构建的最重要过程,它不仅促进了底栖硅藻的方向性扩散,而且通过构建方向性的环境梯度而间接影响群落的空间格局。另外,研究还表明即使在很小的空间尺度上,山地的地形因素依然能够对溪流生物的扩散产生限制作用。而具有不同功能性状的硅藻共位群由于具有不同的环境适应性和扩散方式,因而具有不同的群落构建过程。

原文链接:

Flow directionality, mountain barriers and functional traits determine diatom metacommunity structuring of high mountain streams

原文摘要:

Stream metacommunities are structured by a combination of local (environmental filtering) and regional (dispersal) processes. The unique characters of high mountain streams could potentially determine metacommunity structuring, which is currently poorly understood. Aiming at understanding how these characters influenced metacommunity structuring, we explored the relative importance of local environmental conditions and various dispersal processes, including through geographical (overland), topographical (across mountain barriers) and network (along flow direction) pathways in shaping benthic diatom communities. From a trait perspective, diatoms were categorized into high-profile, low-profile and motile guild to examine the roles of functional traits. Our results indicated that both environmental filtering and dispersal processes influenced metacommunity structuring, with dispersal contributing more than environmental processes. Among the three pathways, stream corridors were primary pathway. Deconstructive analysis suggested different responses to environmental and spatial factors for each of three ecological guilds. However, regardless of traits, dispersal among streams was limited by mountain barriers, while dispersal along stream was promoted by rushing flow in high mountain stream. Our results highlighted that directional processes had prevailing effects on metacommunity structuring in high mountain streams. Flow directionality, mountain barriers and ecological guilds contributed to a better understanding of the roles that mountains played in structuring metacommunity.

来源: Scientific Reports 浏览次数:1

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