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Monitoring Litter Inputs from the Adour River (Southwest France) to the Marine Environment
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Researchers monitored litter inputs from the Adour River catchment in southwest France over three years, collecting and categorising over 120,000 items across 278 sampling events. Food and beverage packaging, tobacco-related debris, and sewage-related items together accounted for roughly 70% of identifiable litter, with 41% of all items too degraded to classify.
Rivers are major pathways for litter to enter the ocean, especially plastic debris. Yet, further research is needed to improve knowledge on rivers contribution, increase data availability, refine litter origins, and develop relevant solutions to limit riverine litter inputs. This study presents the results of three years of aquatic litter monitoring on the Adour river catchment (southwest of France). Litter monitoring consisted of collecting all litter stranded on river banks or stuck in the riparian vegetation in defined areas identified from cartographic and hydromorphological analyses, and with the support of local stakeholders. Litter samples were then sorted and counted according to a list of items containing 130 categories. Since 2014, 278 litter samplings were carried out, and 120,632 litter items were collected, sorted, and counted. 41% of litter could not be identified due to high degradation. Food and beverage packaging, smoking-related items, sewage related debris, fishery and mariculture gear, and common household items represented around 70% of identifiable items. Overall, the present study contributes to our knowledge of litter sources and pathways, with the target of reducing the amounts entering the ocean. The long-term application of this monitoring is a way forward to measure societal changes as well as assess effectiveness of measures.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.