Quantitative and qualitative changes in dissolved organic matter and bacteria in Lake Biwa

点击翻译按钮获取中文摘要

We have clarified the microbial processes below: In the epilimnion of Lake Biwa during the stratified period, phytoplankton produce protein-like dissolved organic matter (DOM), and the DOM is converted into humic-like DOM through decomposition by planktonic bacteria. The humic-like DOM is transported to the hypolimnion through winter vertical mixing. In the hypolimnion during the stratified period, only one bacterial species, CL500-11 (phylum Chloroflexi), predominates, and bacterivorous Kinetoplastid flagellates also dominate. So, in the hypolimnion of Lake Biwa during the stratified period, there may be the unique microbial food webs where humic-like DOM is consumed by bacterial assemblages predominated by CL500-11, and where those bacteria are grazed by bacterivorous protists such as Kinetoplastids.