Macroplastic distribution patterns and accumulation in an urbanised Austral subtropical river system

Area of Science:

• Environmental Science
• Ecology
• Pollution Studies

Background:

• Plastic pollution poses a global threat to ecosystems, particularly aquatic environments.
• Knowledge gaps exist regarding macroplastic pollution in African freshwater systems.
• Anthropogenic activities contribute significantly to plastic litter in rivers.

Purpose of the Study:

• To determine the abundance and distribution of macroplastic litter in the South African Crocodile River system.
• To analyze seasonal variations and identify dominant macroplastic types and polymers.
• To provide baseline data for informing management policies and addressing knowledge gaps in underrepresented regions.

Main Methods:

• Sampling macroplastic litter at seven riparian sites across four seasons.
• Classifying macroplastics by polymer group, functional origin, and physical form.
• Statistical analysis of abundance and distribution patterns across sites and seasons.

Main Results:

• Significant differences in macroplastic abundance and distribution were observed across sites and seasons.
• Autumn showed the highest macroplastic abundance, contrary to expectations for spring and summer.
• Plastic bags, film, and polypropylene polymers were the most abundant types found.

Conclusions:

• Macroplastic pollution in the Crocodile River system exhibits significant seasonal variability.
• Plastic bags and films are major contributors to riverine plastic pollution.
• This research provides crucial data for targeted interventions in plastic waste management in subtropical river systems.