Distribution patterns of free-living nematodes in differently degraded river reaches of the River Wien, Austria
Distribution patterns of free-living nematodes in differently degraded river reaches of the River Wien, Austria
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DOI：
10.1163/138855409x12465362560395
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发表时间：
2009-01-01
期刊：
影响因子：
1.2
通讯作者：
Eisendle, Ursula
中科院分区：
文献类型：
--
作者：
Eisendle, Ursula
自由生活的线虫群落进行了调查，在四个形态不同的河段沿着的维也纳河，奥地利。在2004-2005年秋、冬、春、夏4个季节对一个近自然河段、两个不同大小的蓄水河段（SI、LI）和一个恢复河段（RR）进行了采样。结果表明，共调查到4144头，其中78种。线虫的蓄水站点贡献最少（5%在SI）和最（60%在LI）的总动物。平均站点丰度（ind./ RR、NN、LI和SI的平均直径分别为68、27、10和1。物种多样性从LI的1.59到RR的2.16不等。食细菌线虫占主导地位的所有网站（>50%），只有食藻Chromadoridae代表了高百分比的贡献（46%）在LI。基于这一高比例，成熟度指数（MI 1-5）在该地点最高（2.61）。MI表示NN（2.5）的良好水质状态。相对较低的MI（2.10）和高部分的cp 1 Secernentea（14%）反映了在恢复现场的严重污染的状态。平均分类独特性（ATD）的模式没有最佳地反映栖息地质量，一个更好的描述退化河流栖息地的分类独特性（VTD）的变化似乎在这项研究中。总之，MI似乎是一个更好的描述污染和形态退化的VTD。
Free-living nematode communities were investigated at four morphologically different reaches along the River Wien, Austria. A near natural (NN) reach, two impounded reaches of different size (small and large: SI, LI) and a restored reach (RR) were sampled in autumn, winter, spring and summer (2004-2005). A total of 4144 individuals were counted and comprised 78 species. Nematodes of the impounded sites contributed least (5% at SI) and most (60% at LI) to the total fauna. Mean site abundances (ind./10 cm(2)) were 68, 27, 10 and 1 at RR, NN, LI and SI, respectively. Species diversity ranged from 1.59 at LI to 2.16 at RR. Bacterivorous nematodes dominated all sites (>50%); only algivorous Chromadoridae represented a high percentage contribution (46%) at LI. Based on this high portion, the maturity index (MI 1-5) was highest at this site (2.61). The MI indicated status of good water quality for the NN (2.5). The relatively low MI (2.10) and the high portion of cp1 Secernentea (14%) reflect the status of critical pollution at the restored site. The patterns of average taxonomic distinctness (ATD) did not optimally reflect habitat quality; a better descriptor of degraded river habitats seems to be the variation of taxonomic distinctness (VTD) in this study. In conclusion, the MI seems to be a better descriptor of pollution and the VTD of morphological degradation.