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Stoichiometric theory in aquatic carbon sequestration under elevated carbon dioxide
Zhenyao Sun1, Hao Wang2, Meng Fan3
1School of Mathematics and Statistics, Northeast Normal University, 5268 Renmin Street, Changchun, Jilin, 130024, PR China; Interdisciplinary Lab for Mathematical Ecology and Epidemiology, Department of Mathematical and Statistical Sciences, University of Alberta, Edmonton T6G 2G1, Canada.
Mathematical Biosciences
|August 23, 2024
Summary
Elevated carbon dioxide levels boost algae growth, enhancing aquatic carbon sequestration. However, high carbon dioxide concentrations harm bacteria, potentially reducing their biomass and impacting microbial community structure.
Area of Science:
- Environmental Science
- Microbiology
- Climate Science
Background:
- Global climate change is increasing atmospheric carbon dioxide (CO2).
- The impact of elevated CO2 on aquatic carbon sequestration and microbial communities is not fully understood.
- Aquatic ecosystems play a crucial role in global carbon cycling.
Purpose of the Study:
- To model the effects of elevated CO2 on aquatic ecosystems, specifically bacteria-algae interactions.
- To determine thresholds for algae and bacteria persistence or extinction under changing CO2 levels.
- To investigate the influence of abiotic factors on aquatic microbial dynamics.
Main Methods:
- Formulation of a bacteria-algae interaction model.
- Mathematical derivation of critical thresholds for species dynamics.
- Numerical simulations incorporating abiotic factors like light, nutrients, and water depth.
Main Results:
- Elevated CO2 increases algae biomass, promoting carbon sequestration.
- Elevated CO2 reduces bacterial biomass; excessive levels can lead to community collapse.
- Eutrophication and high light intensity decrease carbon sequestration, but elevated CO2 can mitigate eutrophication.
- Algal respiration/death negatively impacts carbon sequestration, while bacterial respiration enhances it.
Conclusions:
- Elevated atmospheric CO2 has a dual effect on aquatic ecosystems: promoting algae growth and carbon sequestration while negatively impacting bacterial communities.
- Understanding these complex interactions is vital for predicting the future of aquatic carbon cycling under climate change.
- Abiotic factors significantly modulate the response of aquatic microbial communities to elevated CO2.
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