The role of viruses in saline Antarctic lakes
收藏资源简介：
Metadata record for data from ASAC Project 2306See the link below for public details on this project.---- Public Summary from Project ----In the last ten years aquatic microbial ecologists have come to appreciate the potential importance of viruses in microbial community dynamics. Bacteria, algae and protists are all infected by viruses and suffer lysis. This impacts on the cycling of carbon and essential inorganic nutrients (nitrogen and phosphorus) in marine and freshwater ecosystems. In order to produce accurate models of these biogeochemical processes, we must gain a full understanding of the nature, abundances, infectivity and turnover rates of viruses in aquatic ecosystems. There is clear evidence that viruses may also maintain clone diversity of microbial elements in the plankton directly by gene transmission or transduction, and indirectly by eliminating dominant host species. Moreover, they also appear to be grazed, along with bacteria, by heterotrophic nanoflagellates. Thus the role of viruses is multifarious and there is a growing realisation that these tiny particles, which can reach abundances of 108 ml-1 in aquatic ecosystems, may play a major role in mediating community dynamics and geochemical processes. We propose investigating the role of viruses marine microbial communities, by using natural, simplified model ecosystems. They are dominated by a microbial plankton, there are no fish and few or no zooplankton. The saline lakes are marine derived systems retaining elements of the marine microbial plankton, and are consequently analogues of the marine environment.In addition to more easily clarify the role of viruses in biogeochemical cycling we will incorporate a study of cryconite holes.The dataset is stored as an excel spreadsheet, and divided into 3 sheets - one for each lake studied: Ace Lake, Pendant Lake, Highway Lake. A text document detailing the methods used in the study is also available for download.The fields in this dataset are:LocationDateSampling depthsnowcoversnow depthice depthPARtemperatureconductivitypHNO3PONH4Total Oxygen ContentDissolved Oxygen ContentChlorophyllVirusHeterotrophic bacteriaPhototrophic bacteriaPyramimonasCryptophytesChlamydomonas Type 2HNANCryptophyte Type 1BacteriaPPRLeucine BPRThymidine BPR
ASAC项目2306数据集元数据记录，可点击下方链接查看该项目公开详情。——项目公开摘要—— 近十年来，水生微生物生态学家逐渐认识到病毒在微生物群落动态中的潜在重要性。细菌、藻类与原生生物均会被病毒感染并发生裂解，这会影响海洋与淡水生态系统中碳及关键无机营养盐（氮、磷）的循环过程。为构建这些生物地球化学过程的精准模型，我们需要全面掌握水生生态系统中病毒的本质、丰度、感染性及周转率。 已有明确证据表明，病毒可通过基因传递或转导直接维持浮游微生物群落的克隆多样性，也可通过清除优势宿主物种间接实现这一目标。此外，病毒还会与细菌一同被异养纳米鞭毛虫捕食。由此可见病毒的作用具有多重性，学界也愈发认识到，这类在水生生态系统中丰度可达10^8 个/毫升的微小颗粒，可能在调控群落动态与地球化学过程中发挥关键作用。 我们计划借助天然简化的模型生态系统，探究病毒在海洋微生物群落中的作用。这类模型生态系统以浮游微生物为优势类群，无鱼类且几乎不存在或仅存在极少量浮游动物。本次研究选取的盐湖均为海洋起源系统，保留了海洋浮游微生物群落的组成特征，因此可作为海洋环境的类比模型。 除了更清晰地阐明病毒在生物地球化学循环中的作用外，我们还将开展冰尘孔（cryconite holes）相关研究。 本数据集以Excel电子表格形式存储，共分为3个工作表，分别对应本次研究的3个湖泊：艾斯湖（Ace Lake）、彭南特湖（Pendant Lake）与海维湖（Highway Lake）。另有一份详述研究方法的文本文件可供下载。 本数据集包含以下字段：采样地点、采样日期、采样深度、积雪覆盖状况、积雪厚度、冰层厚度、光合有效辐射（PAR）、水温、电导率、pH值、硝酸盐（NO3）、颗粒有机氮（PON）、氨氮（NH4）、总含氧量、溶解氧含量、叶绿素、病毒丰度、异养细菌、光合细菌、普林藻属（Pyramimonas）、隐藻、2型衣藻、HNANC、1型隐藻、细菌PPR、亮氨酸BPR、胸苷BPR
