Microplastics Pollution, Riparian Vegetation and Erosion: Contributions to the Biogeochemistry of Aquatic Systems in a Context of Climate Change
Aquatic ecosystems face significant challenges due to the growing prevalence of microplastics, which can disrupt the delicate biogeochemical cycles and ecosystem services. This presentation explores how microplastics, riparian vegetation, and erosion interact to shape the health of our waterways in the face of climate change.
MS
by Marola Saa
What are Microplastics and How Do They Enter Aquatic Systems?
1
Definition of Microplastics
Tiny plastic particles less than 5 mm in size, originating from the breakdown of larger plastic waste.
2
Sources of Microplastics
Microfibers from clothing, microbeads in personal care products, and the fragmentation of larger plastic items.
3
Pathways into Aquatic Ecosystems
Microplastics can be transported by wastewater, stormwater runoff, and wind, eventually ending up in rivers, lakes, and oceans.
The Role of Riparian Vegetation in Trapping and Transporting Microplastics
Trapping Microplastics
Riparian vegetation acts as a natural barrier, trapping and retaining microplastics from entering waterways.
Transport Mechanism
During high-flow events, microplastics can be mobilized and transported by the vegetation, further distributing them in the ecosystem.
Biogeochemical Impacts
The interaction between microplastics, vegetation, and water flow can alter nutrient cycling and sediment dynamics in aquatic systems.
Erosion and its Impact on Microplastics Distribution in Aquatic Environments
1
Soil Erosion
Increased erosion due to climate change and land-use changes can dislodge microplastics from terrestrial sources.
2
Transport by Water Flow
Eroded microplastics are then transported by rivers, streams, and surface runoff into aquatic ecosystems.
3
Deposition and Accumulation
Microplastics can settle and accumulate in sediments, altering benthic habitats and disrupting aquatic food webs.
Biogeochemical Cycling of Microplastics in Aquatic Ecosystems
Adsorption of Pollutants
Microplastics can adsorb and transport various pollutants, including heavy metals and persistent organic compounds.
Trophic Transfer
Microplastics can be ingested by aquatic organisms and subsequently transferred through the food web.
Biogeochemical Cycling
The movement and transformation of microplastics can alter nutrient and carbon cycles in aquatic systems.
Ecological Impacts
Microplastics can disrupt ecosystem functions and services, affecting the health and productivity of aquatic environments.
Interactions between Microplastics, Nutrients, and Other Pollutants
1
Adsorption
Microplastics can adsorb and transport various pollutants, including nutrients and heavy metals.
2
Desorption
Pollutants adsorbed to microplastics can be released back into the water, altering bioavailability.
3
Bioaccumulation
Microplastics can facilitate the bioaccumulation of pollutants up the food chain, posing risks to higher trophic levels.
The Influence of Climate Change on Microplastics Pollution and Aquatic Biogeochemistry
Temperature Increase
Warmer temperatures can accelerate the fragmentation of larger plastic items into microplastics.
Precipitation Changes
Altered precipitation patterns can impact the transport and distribution of microplastics in aquatic systems.
Extreme Weather Events
Increased frequency and intensity of storms can mobilize and redistribute microplastics in the environment.
Ecosystem Disruption
The combined effects of climate change and microplastics pollution can severely impact aquatic ecosystem health and services.
Implications for Ecosystem Health and Services
Biodiversity Impacts
Microplastics can disrupt the delicate balance of aquatic ecosystems, leading to a decline in biodiversity and ecosystem resilience.
Ecosystem Services
The degradation of aquatic environments due to microplastics can compromise essential ecosystem services, such as water purification, nutrient cycling, and food production.
Human Health Concerns
The accumulation of microplastics and associated pollutants in aquatic food webs can potentially pose risks to human health through the consumption of contaminated seafood.
Strategies for Mitigating Microplastics Pollution in Aquatic Systems
1
Source Reduction
Implementing policies and regulations to reduce the production and use of single-use plastics and microbeads.
2
Improved Waste Management
Enhancing waste collection, recycling, and disposal systems to prevent plastic waste from entering the environment.
3
Nature-based Solutions
Restoring and protecting riparian vegetation to enhance the natural trapping and filtration of microplastics.
4
Advanced Water Treatment
Developing innovative technologies to remove microplastics from wastewater and stormwater before they reach aquatic ecosystems.