Spatiotemporal variations and relationships of phosphorus, phosphomonoesterases, and bacterial communities in sediments from two Chilean rivers
Spatiotemporal variations and relationships of phosphorus, phosphomonoesterases, and bacterial communities in sediments from two Chilean rivers
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DOI：
10.1016/j.scitotenv.2021.145782
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发表时间：
2021-03-02
影响因子：
9.8
通讯作者：
Jorquera, Milko A.
中科院分区：
文献类型：
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作者：
Campos, Marco;Rilling, Joaquin, I;Jorquera, Milko A.
河流是智利南部重要的生态系统服务提供者；然而，大多数河流的微生物学研究不足。这对于通过细菌活动回收磷(P)来说尤其如此。在这里，我们研究了夏季和冬季在人为影响程度较低和较大程度的地点采集的智利河流沉积物(智利帝国河和托尔滕河)的物理化学性质、磷含量、磷酸单酯酶(Pase)活性和细菌Pase基因(phod、Phoc和Phox)。讨论了细菌群落的丰富度、多样性、组成和预测功能，以及与磷相关的参数和细菌群落之间的时空关系。我们的结果显示出时空变化，突出了夏季人类活动较多的地点采集的沉积物中温度、电导率、营养物质(C、N、P)、Pase活性和Pase基因的较高值。相反，在冬季采集的沉积物中发现了更高的细菌总数丰富度、多样性和丰度。变形杆菌门和异养菌门分别是最丰富的细菌类群和预测功能。还揭示了冬季和夏季沉积物之间的差异，证实了细菌群落与磷相关参数的关系。我们的分析还强调了Pase基因与菊科、黄单胞菌科和几丁虫科之间的正相关关系，以及Pase活性与色素科和硫杆菌科之间的关系。这项研究是一项初步调查，旨在揭示这些受到人为活动(如农业、工业、城市等)威胁的土壤中细菌群落的组成及其与磷循环的关系。这些信息可用于设计防止智利河流恶化的对策，这些河流与生态系统服务提供者有关。(C)2021年爱思唯尔公司保留所有权利。
Rivers are important ecosystem services providers in southern Chile; however, the microbiology of most rivers are understudied. This is particularly true for phosphorus (P) recycling by bacterial activity. Here, we studied the physicochemical properties, P contents, phosphomonoesterase (Pase) activities, and bacterial Pase genes (phoD, phoC, and phoX) in Chilean river sediments (Imperial and Tolten rivers, Chile) collected in sites with less and more degrees of anthropogenic influence during the summer and winter seasons. The richness, diversity, composition, and predicted function of the bacterial communities were addressed, as well as the spatiotemporal relationships among P-associated parameters and bacterial communities. Our results showed spatiotemporal variations, highlighting higher values of the temperature, conductivity, nutrients (C, N, P), Pase activity, and Pase genes in sediments collected in sites more anthropogenized during summer. In contrast, higher richness, diversity, and abundance of total bacteria were found in sediments collected in winter. The phylum Proteobacteria and heterotrophy were the most relatively abundant bacterial taxa and predicted function, respectively. The differentiation among winter and summer sediments was also revealed and the relationships between bacterial community and P-associated parameters were confirmed. Our analysis also highlighted the positive relationship between Pase genes with Gemmataceae, Xanthomonadaceae, and Chitinophagaceae families, and between Pase activity and Po with Chromatiaceae and Desulfobacteraceae families. This study represents an initial investigation aimed to unravel the compositions and relationships of bacterial communities with P recycling in these sedi-ments, which are threatened by anthropogenic activity (e.g., agriculture, industry, cities, etc.). This information may be used in the design of countermeasures to prevent deterioration of Chilean rivers, which are relevant as ecosystem service providers.(c) 2021 Elsevier B.V. All rights reserved.