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Stoichiometric microplastics models in natural and laboratory environments
1Interdisciplinary Lab for Mathematical Ecology & Epidemiology, Department of Mathematical and Statistical Sciences, University of Alberta, Edmonton, Alberta T6G 2G1, Canada.
Journal of Theoretical Biology
|January 15, 2024
Summary
Mathematical models reveal microplastics significantly impact marine producer-grazer dynamics. Environmental factors like nutrients and light intensity interact with microplastic effects, influencing population stability and organism vulnerability.
Area of Science:
- Marine Ecology
- Mathematical Biology
- Environmental Science
Background:
- Microplastics are a growing threat to marine ecosystems.
- Limited mathematical models exist to study microplastic impacts on marine populations.
- Understanding these dynamics is crucial for conservation efforts.
Purpose of the Study:
- To develop and analyze stoichiometric producer-grazer models incorporating microplastics.
- To investigate the interactive effects of microplastics, nutrients, and light on marine population dynamics.
- To compare model behaviors in natural versus laboratory settings.
Main Methods:
- Formulation of two stoichiometric producer-grazer models.
- Inclusion of optimal microplastic uptake and foraging behavior in one model.
- Mathematical analysis of model well-posedness and long-term dynamics.
Main Results:
- Producers and grazers show heightened sensitivity to microplastics in natural settings.
- System dynamics can exhibit bistability or tristability.
- Microplastic effects are intertwined with nutrient and light intensity, influencing grazer growth and organism body burdens.
- Grazers are more vulnerable to microplastics than producers.
- Producer utilization of microplastics enhances system resilience.
Conclusions:
- Microplastic pollution poses complex challenges to marine food webs.
- Environmental conditions significantly modulate the impact of microplastics on marine organisms.
- Further research into producer-grazer interactions under microplastic stress is warranted.
