湖泊科学2021，Vol.33Issue(2)：349-365,17.DOI:10.18307/2021.0205
风生紊流导致微囊藻群体破碎和形态变化
Wind induced turbulence caused colony disaggregation and morphological changes in the cyanobacterium Microcystis
摘要
Abstract
Colony size and morphology influence the vertical migration capacity of Microcystis and therewith the occurrence of sur-face accumulations or blooms. To explore the influence of wind-induced turbulence on the colony size and morphology of Microcystis in field conditions, a high-frequency field investigation was conducted in an enclosure in Meiliang Bay, Lake Taihu, China, from 26 August to 7 September 2012. A Pearson's correlation analysis indicated that the in situ growth rate of Microcystis was negatively related to surface cell density and positively related to wind speed. Strong wind speed stimulated Microcystis growth by enhancing light transmission due to the homodispersion of Microcystis in the water column. The Microcystis colony size was negatively correlated with wind speed, suggesting that wind-induced turbulence could break up colonies in shallow lakes. The results indicated that Mi-crocystis colonies could be broken up by a turbulence intensity of 2.33×10-5 m2/s3, which corresponds to an average wind speed of 5.00 m/s in a reservoir with 30-m depth. Different Microcystis morphotypes were present and negative relationships were detected between the proportion of Microcystis ichthyoblabe and the proportion of Microcystis wesenbergii and between the proportion of Micro-cystis aeruginosa and the proportion of Microcystis wesenbergii out of all Microcystis throughout the water column, but more evidence is need to support the hypothesis that the morphology of Microcystis colonies changes over time. Altogether, the results suggest that declining wind speed, driven by climate change, will promote surface blooms of Microcystis due to the formation of larger colonies.关键词
微囊藻/水华/紊流/群体粒径/形态/太湖Key words
Microcystis/water blooms/turbulence/colony size/morphology/Lake Taihu引用本文复制引用
朱伟,陈怀民,肖曼,LürlingMiquel,李明..风生紊流导致微囊藻群体破碎和形态变化[J].湖泊科学,2021,33(2):349-365,17.基金项目
国家自然科学基金项目(51979236)和江苏省科技计划项目(BE2018737)联合资助. （51979236）
