Nematode communities in pine forests are shaped by environmental filtering of habitat conditions
Nematode communities in pine forests are shaped by environmental filtering of habitat conditions
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DOI：
10.1080/13416979.2018.1516920
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发表时间：
2018-09
影响因子：
1.5
通讯作者：
Y. Kitagami;T. Tanikawa;T. Mizoguchi;Y. Matsuda
中科院分区：
文献类型：
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作者：
Y. Kitagami;T. Tanikawa;T. Mizoguchi;Y. Matsuda
摘要 土壤线虫通过以微生物为食参与营养循环，其功能程度受到微妙的环境变化和生物相互作用的影响。考虑到这些特征，土壤线虫可以作为反映特定生态系统环境变化的生物指示剂。然而，由于森林生态系统中复杂的生物相互作用，线虫群落结构的形成机制尚不清楚。本研究的目的是阐明日本中部沿海和内陆黑松森林在对比环境条件下的线虫群落及其决定因素。为此，从土壤样本中提取的线虫在一般水平上进行形态学鉴定并区分为营养组。我们还根据非度量多维尺度确定了线虫群落结构是否随沿海或内陆位置而变化。我们的结果表明，内陆生境的线虫总体丰富度（16.2±0.7，平均值±SE）显着高于沿海生境（12.4±0.4）。此外，非度量多维尺度散点图显示线虫群落在各自的沿海和内陆栖息地内显着聚集。这些聚类进一步受到周围环境因素的显着影响；土壤含水量、土壤温度、枯落物层厚度、pH、总氮和总碳浓度以及碳氮比。对于特征营养类群，沿海森林以食微生物线虫为主，而内陆森林则以捕食性线虫为主。我们的研究提供了有关环境过滤形成的线虫群落结构形成的基础知识。
ABSTRACT Soil nematodes are involved in nutrient cycles through feeding on microorganisms, and the extent of their functioning is affected by subtle environmental changes and by biological interactions. Considering these features, soil nematodes can serve as bio-indicators reflecting environmental changes in a given ecosystem. However, the mechanism of shaping community structures of nematodes is not well understood due to the complex biological interactions in forest ecosystems. The aim of this study was to clarify the nematode communities and their determinant factors in both coastal and inland Pinus thunbergii forests of central Japan under contrasting environmental conditions. For this purpose, nematodes retrieved from soil samples were morphologically identified at generic levels and discriminated into trophic groups. We also determined whether nematode community structures varied with coastal or inland locations based on non-metric multidimensional scaling. Our results showed that generic richness of nematode at inland habitats (16.2 ± 0.7, mean ± SE) was significantly greater than that at coastal habitats (12.4 ± 0.4). Moreover, the non-metric multidimensional scaling scatter-plot showed nematode communities clustered significantly within their respective coastal and inland habitats. These clusterings were further significantly influenced by surrounding environmental factors; soil water content, soil temperature, litter layer thickness, pH, total both N and C concentrations and C:N ratio. For characteristic trophic groups, microbial-feeding nematodes were represented in coastal forests while predaceous ones were dominated in inland forests. Our study provided fundamental knowledge on the formation of nematode community structures that were shaped by environmental filtering.