Understanding filamentous cyanobacteria and their adaptive niches in Lake Honghu, a shallow eutrophic lake

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Guangbin Gao , Dong Bai , Tianli Li , Jie Li , Yunlu Jia , Jing Li , Zhi Wang , Xiuyun Cao , Lirong Song
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Abstract

Freshwater lakes globally are witnessing an escalation in the frequency and intensity of cyanobacterial harmful blooms. However, underlying factors influencing the succession or coexistence of cyanobacteria, especially filamentous ones, remain poorly understood. Lake Honghu, a Ramsar Wetland of International Importance with degrading aquatic ecological quality, served as a case study to elucidate the intricate relationship between environmental changes and cyanobacterial dynamics. Our analysis revealed a significant increase in the dominance of filamentous cyanobacteria, marked by high spatiotemporal variability in community structure. This dominance of filamentous diazotrophic cyanobacteria is attributed to a decrease in the ratio of dissolved inorganic nitrogen to total phosphorus and their capacity to utilize organic phosphorus in phosphorus-deficient conditions. Species-specific density variations were linked to diverse environmental factors, with total nitrogen or total phosphorus concentration remaining as a crucial factor influencing dominant cyanobacterial density fluctuations. The dominance of low-temperature-tolerant Aphanizomenon and Pseudanabaena was evident in spring and winter, whereas Dolichospermum and Cylindrospermopsis, which prefer higher temperatures, thrived in summer and autumn. Additionally, non-algal turbidity and heterogeneity can potentially alter the competitive outcome among filamentous cyanobacteria or foster coexistence under conditions of elevated temperatures and nutrient limitation. This study predicts that filamentous cyanobacteria may spread and persist in lakes spanning a wide trophic range. Current findings enhance our comprehension of the dynamic responses exhibited by filamentous bloom-forming cyanobacteria in the face of environmental changes within shallow eutrophic lakes and provide valuable insights for lake managers involved in the remediation of degraded shallow lakes.

Abstract Image

了解洪湖浅富营养化湖泊中的丝状蓝藻及其适应性生态位
全球淡水湖蓝藻有害藻华的发生频率和强度都在不断上升。然而,人们对影响蓝藻(尤其是丝状蓝藻)演替或共存的潜在因素仍然知之甚少。洪湖是拉姆萨尔国际重要湿地,其水生生态质量不断恶化,我们以洪湖为案例,阐明了环境变化与蓝藻动态之间错综复杂的关系。我们的分析表明,丝状蓝藻的优势度明显增加,群落结构的时空变异性很高。丝状重氮蓝藻占优势的原因是溶解无机氮与总磷的比例下降,以及它们在缺磷条件下利用有机磷的能力下降。物种特异性密度变化与多种环境因素有关,总氮或总磷浓度仍然是影响优势蓝藻密度波动的关键因素。耐低温的 Aphanizomenon 和 Pseudanabaena 在春季和冬季明显占优势,而喜欢较高温度的 Dolichospermum 和 Cylindrospermopsis 则在夏季和秋季生长旺盛。此外,在温度升高和营养限制条件下,非海藻浊度和异质性可能会改变丝状蓝藻之间的竞争结果或促进共存。本研究预测,丝状蓝藻可能会在跨度很大的营养级范围的湖泊中传播和持续存在。目前的研究结果加深了我们对丝状蓝藻面对浅表富营养化湖泊环境变化所表现出的动态响应的理解,并为湖泊管理者参与退化浅表湖泊的修复工作提供了宝贵的见解。
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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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