Coupled effects of land use pattern and hydrological regime on composition and diversity of riverine eukaryotic community in a coastal watershed of Southeast China
Coupled effects of land use pattern and hydrological regime on composition and diversity of riverine eukaryotic community in a coastal watershed of Southeast China
复制标题
土地利用格局和水文情势耦合对东南沿海流域河流真核生物群落组成和多样性的影响
DOI：
10.1016/j.scitotenv.2019.01.063
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发表时间：
2019-04-10
影响因子：
9.8
通讯作者：
Huang, Jinliang
中科院分区：
文献类型：
--
作者：
Huang, Yaling;Huang, Jinliang
为了理解河流生态系统健康和藻类水华机制，需要了解土地利用模式和水文状况对河流真核生物群落组成和多样性的耦合效应。在中国东南沿海一个流域，通过原位监测和18S rRNA基因测序，研究了在三个季节（旱季、过渡期和雨季）三种不同主要土地利用类型（即城市、森林和自然）的流域中真核生物群落的时空变化。结果表明，在旱季和过渡期，农业和城市流域的多样性显著高于森林流域，在过渡期和雨季，其丰富度也高于森林流域。非度量多维尺度分析进一步证实了真核生物群落存在较大的时空变化。在三个季节中，所有采样点的序列读数主要由不等鞭毛类、囊泡虫类、动物界和真核生物界主导。农业流域动物界的相对丰度最高，而城市流域真核生物界最丰富，森林流域不等鞭毛类和囊泡虫类的相对丰度最高。冗余分析排序表明，建成区和水流分别是中等分类群和丰富分类群的两个最重要因素。方差分解显示，土地利用模式和水文状况共同解释了真核生物群落组成54.4%、61%和67.2%的方差。在三个采样季节中，土地利用模式的相对贡献高于水文状况。这项研究的结果展示了土地利用模式和水文状况如何影响河流真核生物群落的组成和多样性。这些发现可以为中国沿海流域的河流真核生物群落及其潜在生态机制提供有用的见解。（C）2019爱思唯尔B.V.保留所有权利。
The coupled effects of land use pattern and hydrological regime on composition and diversity of riverine eukaryotic community are needed for understanding riverine ecosystem health and algal blooming mechanism. In-situ monitoring and 18S rRNA gene sequencing were used to investigate spatiotemporal variations of eukaryotic community in three types of watershed with different dominant land use type (i.e. urban, forest, and natural) during three seasons (i.e. dry, transition, and wet seasons) in a coastal watershed of Southeast China. Results showed that agricultural and urban watersheds had significantly higher diversity in dry and transition seasons, and higher richness in transition and wet seasons than those in forest watershed. The non-metric multidimensional scaling analysis further verified great spatiotemporal variations of eukaryotic community. Stramenopiles, Alveolata, Animalia, and Eukaryota, dominated the sequences reads for all sampling sites in three seasons. Agricultural watershed had the highest relative abundant of Animalia, whereas Eukaryota was the most abundant in urban watershed and forest watershed had the highest relative abundance of Stramenopiles and Alveolata. The RDA ordination showed that Builtup and streamflow were two most important factors for moderate taxa and abundant taxa, respectively. Variation partitioning revealed that land use pattern and hydrological regime together explained 54.4%, 61% and 67.2% variances of the composition of eukaryotic community. Among three sampling seasons, the relative contribution of land use pattern was higher than that of hydrological regime. The results of this investigation demonstrated how land use pattern and hydrological regime affected the composition and diversity of riverine eukaryotic community. The findings can provide a useful insight into the riverine eukaryotic communities and their underlying ecological mechanisms in coastal China watersheds. (C) 2019 Elsevier B.V. All rights reserved.