Abstract：
Colonial cyanobacteria have been identified as the primary contributor to the global occurrence of cyanobacterial harmful algal blooms (cyanoHABs), which are further intensified by the presence of \"pseudo-persistent\" antibiotics. Nevertheless, the impact of antibiotics on the growth and size of colonial cyanobacteria remains unclear. In this study, the response of cyanobacterium Microcystis to varying doses of antibiotics was assessed (0, 0.1, 0.5, 1, 10, and 50 μg L-1) by comparing the unicellular and colonial morphotypes. Interestingly, the morphological structure of cyanobacteria plays a significant role in their reaction to antibiotics. In comparison to the unicellular morphotype, the colonial morphotype exhibited a greater promotion in growth rate (11 %-22 %) to low doses of antibiotics and was less inhibited (-121 %--62 %) under high doses. Furthermore, antibiotics may affect the size of cyanobacterial colonies by disrupting the secretion of algal organic matter, which also exhibited a two-phase pattern. This work sheds light on the significance of methodology research involving both unicellular and colonial cyanobacteria. Future research and lake management should prioritize studying the morphological traits of cyanobacteria under different levels of antibiotic exposure. This approach may lead to novel strategies for predicting cyanoHABs under antibiotic pollution more effectively.
摘要：
菌落蓝细菌已被确定为蓝细菌有害藻华（cyanoHAB）全球发生的主要原因。“伪持久性”抗生素的存在进一步加剧了这种情况。然而，抗生素对殖民地蓝细菌的生长和大小的影响尚不清楚.在这项研究中,通过比较单细胞和菌落形态类型,评估了蓝藻微囊对不同剂量抗生素(0,0.1,0.5,1,10和50μgL-1)的反应.有趣的是,蓝细菌的形态结构在其对抗生素的反应中起着重要作用。与单细胞形态相比，殖民地形态型对低剂量抗生素的生长速率有更大的促进作用（11％-22％），而在高剂量下受到的抑制较小（-121％-62％）。此外，抗生素可能通过破坏藻类有机物的分泌来影响蓝藻菌落的大小，这也表现出两相模式。这项工作揭示了涉及单细胞和殖民地蓝细菌的方法学研究的重要性。未来的研究和湖泊管理应优先研究不同抗生素暴露水平下蓝藻的形态特征。这种方法可能会导致更有效地预测抗生素污染下的氰HABs的新策略。
