Zhang Yun, Tao Juan, Wang Jun, Ding Liuyong, Ding Chengzhi, Li Yanling, Zhou Qichao, Li Dunhai, Zhang Hucai
Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650500, China.
Yunnan Key Laboratory of International Rivers and Transboundary Eco-Security, Institute of International Rivers and Eco-Security Yunnan University, Kunming 650500, China.
Microorganisms. 2019 Jul 24;7(8):213. doi: 10.3390/microorganisms7080213.
Diatoms are fundamental carbon sources in a wide range of aquatic food webs and have the potential for wide application in addressing environmental change. Understanding the evolution of topics in diatom research will provide a clear and needed guide to strengthen research on diatoms. However, such an overview remains unavailable. In this study, we used Latent Dirichlet Allocation (LDA), a generative model, to identify topics and determine their trends (i.e., cold and hot topics) by analyzing the abstracts of 19,000 publications from the Web of Science that were related to diatoms during 1991-2018. A total of 116 topics were identified from a Bayesian model selection. The hot topics (diversity, environmental indicator, climate change, land use, and water quality) that were identified by LDA indicated that diatoms are increasingly used as indicators to assess water quality and identify modern climate change impacts due to intensive anthropogenic activities. In terms of cold topics (growth rate, culture growth, cell life history, copepod feeding, grazing by microzooplankton, zooplankton predation, and primary productivity) and hot topics (spatial-temporal distribution, morphology, molecular identification, gene expression, and review), we determined that basic studies on diatoms have decreased and that studies tend to be more comprehensive. This study notes that future directions in diatom research will be closely associated with the application of diatoms in environmental management and climate change to cope with environmental challenges, and more comprehensive issues related to diatoms should be considered.
硅藻是广泛的水生食物网中的基本碳源，在应对环境变化方面具有广泛的应用潜力。了解硅藻研究主题的演变将为加强硅藻研究提供明确且必要的指导。然而，目前仍缺乏这样的综述。在本研究中，我们使用生成模型潜在狄利克雷分配（LDA），通过分析1991年至2018年期间来自科学网的19000篇与硅藻相关的出版物的摘要，来识别主题并确定其趋势（即冷门和热门主题）。通过贝叶斯模型选择共识别出116个主题。LDA识别出的热门主题（多样性、环境指标、气候变化、土地利用和水质）表明，由于密集的人为活动，硅藻越来越多地被用作评估水质和识别现代气候变化影响的指标。就冷门主题（生长速率、培养生长、细胞生活史、桡足类摄食、微型浮游动物放牧、浮游动物捕食和初级生产力）和热门主题（时空分布、形态学、分子鉴定、基因表达和综述）而言，我们确定对硅藻的基础研究有所减少，且研究趋于更加全面。本研究指出，硅藻研究的未来方向将与硅藻在环境管理和气候变化中的应用密切相关，以应对环境挑战，并且应考虑与硅藻相关的更全面的问题。
