College of Environment, Hohai University, Nanjing 210098, Jiangsu, China; Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, Jiangsu, China.
College of Environment, Hohai University, Nanjing 210098, Jiangsu, China.
Harmful Algae. 2019 Nov;89:101667. doi: 10.1016/j.hal.2019.101667. Epub 2019 Oct 4.
Colony formation provides excellent advantages for the dominance of Microcystis. However, studies on microenvironments during the process of colony formation are rare, especially regarding intra-colony light usage. This study analyzed the attenuation of light intensity in Microcystis colonies, where most objects followed Lambert-Beer law ( [Formula: see text] ). Intra-colony light limited the maximum thickness of the colony (B=4.3×10c) and thus affected colony size. Field data showed that the colony size for M. ichthyoblabe was small and limited to approximately 300 μm, while larger colonies were mainly formed by M. aeruginosa and M. wesenbergii respectively. These results imply that the strategies used by morphospecies to allow colonies to tolerate intra-colony light limitation might be different; M. aeruginosa benefited from a reticular growth pattern, and M. wesenbergii colonies were large (500 μm), obtaining a large thickness by lowering cell concentration. The results obtained in this work suggest that M. aeruginosa and M. wesenbergii had more advantages regarding intra-colony light usage, colony size level and bloom formation ability in summer and autumn.
集落形成为微囊藻的优势提供了极好的优势。然而，关于集落形成过程中的微环境的研究很少，特别是关于丛内光利用的研究。本研究分析了微囊藻集落中光强的衰减，其中大多数物体都遵循朗伯-比尔定律（[公式：见文本]）。丛内光限制了集落的最大厚度（B=4.3×10c），从而影响了集落大小。野外数据表明，M. ichthyoblabe 的集落大小较小，限制在约 300μm 左右，而较大的集落主要由 M. aeruginosa 和 M. wesenbergii 形成。这些结果表明，形态种用于使集落能够耐受丛内光限制的策略可能不同；M. aeruginosa 受益于网状生长模式，而 M. wesenbergii 集落较大（500μm），通过降低细胞浓度获得较大的厚度。本工作的结果表明，M. aeruginosa 和 M. wesenbergii 在夏季和秋季具有更多的丛内光利用、集落大小水平和形成水华的能力优势。
