Relation between nematode communities and trophic state in southern Swedish lakes
Relation between nematode communities and trophic state in southern Swedish lakes
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瑞典南部湖泊线虫群落与营养状态的关系
DOI：
10.1007/s10750-010-0564-5
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发表时间：
2011
期刊：
影响因子：
2.6
通讯作者：
W. Traunspurger
中科院分区：
文献类型：
--
作者：
Kai Ristau;W. Traunspurger
本研究旨在探讨湖泊营养状态对沿岸的线虫群落格局的影响。据推测，营养级与杂食动物的比例呈负相关，与细菌饲养者的百分比呈正相关，但与淡水线虫的多样性，丰度和生物量完全无关。2007年春季和秋季，在瑞典南部8个湖泊的不同奖杯的沿岸的地点采集沉积物样品。营养水平强烈影响物种丰富度，寡营养和中营养湖泊支持最大的物种数量，而线虫丰度，生物量和香农指数不受影响。此外，我们的研究结果表明，线虫群落的营养结构的影响，捕食性线虫在贫营养和中营养湖泊的比例较大，但在其他喂养类型（细菌，藻类和吸食，杂食性物种）没有差异。多变量分析表明，转移的物种组成沿着阈值从中营养到富营养条件下，与Tobrilus gracilis的存在下，沼泽地Montertera，Brevitobrilus stefanskii，Ethmolaimus pratensis与后者有关。贫营养型和中营养型湖泊的线虫群落的特点是由一个类似的物种组成，与显着的Eumonattera longicaudatula，Semitobrilus cf。pellucidus、Prodesmodora circulata和Rhabdolaimus terrestris。总体而言，研究结果表明，湖泊营养状态是一个主要因素结构沿岸的线虫群落，虽然湖内的变化可能是重要的。
The aim of this study was to examine whether littoral nematode community patterns are shaped by lake trophic state. It was hypothesized that trophic level is associated negatively with the proportion of omnivores and positively with the percentages of bacterial feeders, but not at all with the diversity, abundance, and biomass of freshwater nematodes. Sediment samples were taken at littoral sites of eight southern Swedish lakes of different trophy in spring and autumn 2007. Trophic level was found to strongly influence species richness, as oligotrophic and mesotrophic lakes supported the greatest species numbers, whereas nematode abundance, biomass, and Shannon index were unaffected. Furthermore, our results indicated effects on the nematode community’s trophic structure, with a larger proportion of predatory nematodes in oligotrophic and mesotrophic lakes but no differences in the other feeding types (bacteria, algae and suction feeders, omnivorous species). Multivariate analysis indicated a shift in species compositions along the threshold from mesotrophic to eutrophic conditions, with the presence of Tobrilus gracilis, Monhystera paludicola, Brevitobrilus stefanskii, and Ethmolaimus pratensis related to the latter. Nematode communities in oligotrophic and mesotrophic lakes were characterized by a similar species composition, with pronounced occurrences of Eumonhystera longicaudatula, Semitobrilus cf. pellucidus, Prodesmodora circulata, and Rhabdolaimus terrestris. Overall, the results suggested that lake trophic state is a major factor structuring littoral nematode communities, although intra-lake variations might be of importance as well.