Species diversity and random distribution of microfauna in extremely isolated habitable patches on Antarctic nunataks
Species diversity and random distribution of microfauna in extremely isolated habitable patches on Antarctic nunataks
复制标题
南极努纳塔克岛极其孤立的宜居斑块中微型动物的物种多样性和随机分布
DOI：
10.1007/s00300-008-0420-5
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发表时间：
2008
期刊：
影响因子：
1.7
通讯作者：
S. Boström
中科院分区：
文献类型：
--
作者：
B. Sohlenius;S. Boström
后生动物微型动物群（线虫、轮虫和缓步动物）零星分布在南极洲大陆穿透冰盖（冰原岛峰）的山脉露头上。来自类似生境的样本中，微观动物的丰度和动物群组成也有很大差异。类似的似乎可居住的网站没有微型动物和网站的各种组合的动物类群的发生表明，随机殖民化过程以及当地的环境因素和历史因素影响动物群组成在一个特定的可居住的补丁。分析了线虫、轮虫和缓步动物在各种共生组合中的丰度。其中一个目标是调查是否可以观察到这些简单社区的生物相互作用。368个样品来自东南极洲德龙宁毛德地14个冰原岛峰的苔藓、鸟成土和荒地3种生境。这表明，高人口密度的任何三个动物群体，当他们被发现单独和较低的密度，当他们与其他类群共存可能表明存在竞争或捕食。然而，相似的可居住斑块的微型动物密度差异很大，很难在不同复杂程度的样本中发现种群密度的显著差异。
Populations of metazoan microfauna (nematodes, rotifers and tardigrades) are patchily distributed on mountain outcrops penetrating the ice sheet (nunataks) in continental Antarctica. The abundance and fauna composition of microscopic animals vary greatly also among samples from similar types of habitats. Occurrence of similar seemingly habitable sites without microfauna and sites with various combinations of animal taxa indicates that stochastic colonization processes as well as local environmental factors and historical factors influence faunal composition in a specific habitable patch. The abundance of nematodes, rotifers and tardigrades in various combinations of co-occurrence was analyzed. One objective was to investigate if biotic interactions structuring these simple communities could be observed. The 368 samples analysed originate from three kinds of habitats, viz. mosses, ornithogenic soils and fellfield soils, obtained from 14 nunataks in Dronning Maud Land, East Antarctica. It is suggested that high population densities of any of the three animal groups, when they were found alone and lower densities, when they coexisted with other taxa could indicate the presence of competition or predation. However, the great variability in microfauna densities for similar habitable patches made it difficult to find significant differences among population densities in samples with varying complexity.