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The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
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Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
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The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...
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Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
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Updated: Aug 30, 2025

Visualizing Methane-Cycling Microbial Dynamics in Coastal Wetlands
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Frequent algal blooms dramatically increase methane while decrease carbon dioxide in a shallow lake bay.

Lei Zhang1, Kai He2, Tong Wang3

  • 1State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, PR China.

Environmental Pollution (Barking, Essex : 1987)
|August 30, 2022
PubMed
Summary

Frequent algal blooms in freshwater ecosystems significantly increase methane (CH4) release while absorbing atmospheric carbon dioxide (CO2). These dynamics are crucial for understanding lake greenhouse gas emissions and carbon budgets.

Keywords:
Algal bloomCH(4)CO(2)EutrophicationGreenhouse gasesLake Chaohu

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Area of Science:

  • Environmental Science
  • Limnology
  • Biogeochemistry

Background:

  • Freshwater ecosystems are vital for global carbon budgets, but greenhouse gas dynamics during algal blooms are poorly understood.
  • Anthropogenic activities intensify algal blooms, impacting freshwater greenhouse gas emissions.

Purpose of the Study:

  • To investigate spatial and temporal variations of methane (CH4) and carbon dioxide (CO2) in a freshwater bay with frequent algal blooms.
  • To assess the impact of algal blooms on greenhouse gas dynamics and carbon cycling in Lake Chaohu.

Main Methods:

  • Seasonal field investigations were conducted in the Northwest Bay of Lake Chaohu, China.
  • Measurements included spatial and temporal variations in water concentrations of CH4 and CO2.

Main Results:

  • Methane (CH4) concentrations decreased significantly from nearshore to pelagic zones, especially during warm seasons with algal blooms.
  • The bay acts as a constant CH4 source, with concentrations 2-3 orders of magnitude above saturation.
  • Carbon dioxide (CO2) levels showed less substantial changes, with river mouths as hotspots; CO2 acted as a sink during most of the year due to algal photosynthesis.

Conclusions:

  • Intensive algal photosynthesis absorbs atmospheric CO2, increasing dissolved oxygen and pH.
  • Increased CH4 in the bay is linked to the mineralization of autochthonous organic carbon.
  • Frequent algal blooms significantly alter greenhouse gas emissions, making such bays major contributors to lake CH4 emissions and carbon budgets, with implications for other shallow lakes.