沉积微生物的碳代谢强度在浅水淡水湖藻华动态中的关键作用

IF 2.2 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Yaofei Xu, Qi Wei, Zhipeng Wei, Aidong Ruan
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引用次数: 0

摘要

无机碳的获取对藻类的生长至关重要,而湖泊中溶解无机碳(DIC)对浮游植物的限制却鲜为人知。沉积物是微生物新陈代谢的活跃热点,推动着浅水湖泊中元素的迁移和转化,这可能会控制 DIC 的可用性,从而影响藻类的时空动态。因此,我们研究了非藻类繁殖条件下富营养化浅层淡水湖中浮游植物、DIC 和沉积物呼吸速率的时空变化。除河口外,湖中普遍缺乏 DIC。沉积物呼吸作用与 DIC 浓度的变化呈正相关,表明沉积微生物的碳代谢活动是水体的重要无机碳源。受沉积微生物呼吸作用调节的水体中 DIC 的可用性影响着藻类的生物量、组成和生产力。季节性温度变化和沉积物微生物呼吸作用的协同效应影响了浮游植物的垂直分布和迁移。我们的研究结果表明,沉积微生物的碳代谢强度可能对浮游植物的动态变化起着关键作用,并进一步影响富营养化浅淡水湖藻华的时空格局和形成。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Key roles of carbon metabolic intensity of sediment microbes in dynamics of algal blooms in shallow freshwater lakes

Key roles of carbon metabolic intensity of sediment microbes in dynamics of algal blooms in shallow freshwater lakes

Inorganic carbon acquisition is essential to algal growth, while the limitations of dissolved inorganic carbon (DIC) on phytoplankton are still less known in lakes. Sediment is an active hot spot for microbial metabolism, driving the migration and transformation of elements in shallow lakes, which may control the DIC availability to influence algal spatiotemporal dynamics. Hence, we investigated the spatiotemporal changes of phytoplankton, DIC and sediment respiration rates in a eutrophic shallow freshwater lake under non-bloom conditions. There was a widespread deficiency of DIC in the lake, except the estuary. Sediment respiration was positively associated with changes in DIC concentrations, indicating that carbon metabolic activity of sedimentary microorganisms was an important inorganic carbon source for water columns. The availability of DIC in water columns regulated by sediment microbial respiration influenced the algal biomass, composition and productivity. The synergistic effects of seasonal temperature changes and sediment microbial respiration influenced the vertical distribution and migration of phytoplankton. Our results emphasized that carbon metabolic intensity of sediment microorganisms might play a key role in dynamics of phytoplankton, further impacting the spatiotemporal pattern and formation of algal bloom in eutrophic shallow freshwater lakes.

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来源期刊
Hydrobiologia
Hydrobiologia 生物-海洋与淡水生物学
CiteScore
5.40
自引率
11.50%
发文量
288
审稿时长
4.9 months
期刊介绍: Hydrobiologia publishes original research, reviews and opinions regarding the biology of all aquatic environments, including the impact of human activities. We welcome molecular-, organism-, community- and ecosystem-level studies in contributions dealing with limnology and oceanography, including systematics and aquatic ecology. Hypothesis-driven experimental research is preferred, but also theoretical papers or articles with large descriptive content will be considered, provided they are made relevant to a broad hydrobiological audience. Applied aspects will be considered if firmly embedded in an ecological context.
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