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Visualizing Methane-Cycling Microbial Dynamics in Coastal Wetlands
Published on: January 31, 2025
Environmental dynamics as a structuring factor for microbial carbon utilization in a subtropical coastal lagoon
Cecilia Alonso1, Claudia Piccini, Fernando Unrein
1Functional Ecology of Aquatic Systems, Centro Universitario Región Este, Universidad de la República Rocha, Uruguay.
Frontiers in Microbiology
|February 21, 2013
Summary
Laguna de Rocha
Area of Science:
- Microbial Ecology
- Limnology
- Coastal Lagoon Systems
Background:
- Laguna de Rocha, a South American coastal lagoon, experiences periodic connection to the sea.
- This creates distinct Northern (low salinity, high turbidity) and Southern (high salinity, clear water) zones.
- These zones exhibit contrasting physicochemical conditions and microbial communities.
Purpose of the Study:
- To investigate the influence of physicochemical gradients on microbial assemblages in Laguna de Rocha.
- To understand bacterial responses to environmental changes and nutrient availability.
- To model the impact of the lagoon's hydrological cycle on bacterioplankton and carbon processing.
Main Methods:
- Observational study of physicochemical and biological gradients.
- Transplantation experiments of microbial assemblages.
- Addition experiments with carbon, phosphorus, and nitrogen sources.
Main Results:
- Physicochemical conditions strongly influenced microbial community composition.
- Bacterial groups showed differential responses to environmental gradients and carbon addition.
- Carbon availability, not N or P, limited planktonic microbial assemblages.
Conclusions:
- Laguna de Rocha's microbial communities are shaped by its hydrological cycle and carbon limitation.
- Bacterial groups exhibit varying strategies to cope with carbon limitation.
- A model is proposed for hydrology-driven bacterioplankton dynamics and carbon processing.
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