Microplastic in riverine fish is connected to species traits

Area of Science:

• Environmental Science
• Ecotoxicology
• Freshwater Ecology

Background:

• Microplastic contamination is a global environmental concern.
• Rivers act as key pathways for microplastic transport into larger aquatic systems.
• Limited research exists on microplastic ecology within freshwater environments.

Purpose of the Study:

• To investigate microplastic abundance and composition in fish and surface waters of Lake Michigan tributaries.
• To determine the relationship between environmental microplastic levels and fish ingestion.
• To assess the influence of fish ecology, specifically feeding groups, on microplastic uptake.

Main Methods:

• Sampling of microplastics in fish and surface water from three Lake Michigan tributaries.
• Analysis of microplastic abundance and composition in collected samples.
• Statistical analysis to correlate microplastic concentrations with environmental factors and fish characteristics.

Main Results:

• Microplastics were detected in fish and surface waters across all sampling sites.
• No correlation was found between microplastic concentrations in fish and surface waters.
• Fish functional feeding group significantly affected microplastic concentration, with round gobies (zoobenthivores) showing the highest levels.

Conclusions:

• Microplastic pollution is prevalent in river food webs, linked to species-specific feeding behaviors.
• Environmental microplastic abundance in surface waters does not directly predict fish ingestion levels.
• Further research on microplastic sources and pathways is crucial for effective management in inland waters.