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<p>Wood jams, composed of branches, root wads, fine organic matter, and mineral sediments deposited in river channel zones, play several important roles in river ecosystem functioning. Recent studies conducted in mountain rivers in temperate climates showed that wood jams effectively trap macroplastics, which can pose various risks to the organisms inhabiting them. There is no verification of similar effects in mountain rivers in other climates, where riparian vegetation, wood jam characteristics and river hydrological regime can be different. We sampled macroplastics deposited on wood jams and other surfaces within the channel of the&#xa0;small&#xa0;mountainous Mediterranean Aniene&#xa0;river in central&#xa0;Italy. Our results showed that mass of&#xa0;macroplastic debris trapped by wood jams exceeded those trapped by woody vegetation, herbaceous vegetation, and exposed river sediments by factors of 10, 150, and 600, respectively. These results confirm previous observations from temperate mountain rivers, indicating that wood jams act as temporary hotspots for macroplastic accumulation and potential source of its future remobilization along rivers. Based on this similarity in macroplastic-wood jam interaction, we introduced the term “<i>plastic-wood jam</i>” to describe a specific depositional form that links wood jams with plastic debris in plastic-polluted river systems.</p>

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Plastic-wood jams: macroplastic deposition on woody debris in a Mediterranean mountain river and its similarities to temperate ecosystems

  • 期刊论文

  • 发表日期：

    2025年5月6日

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  • Maciej Liro,
  • Luca Gallitelli

摘要

Wood jams, composed of branches, root wads, fine organic matter, and mineral sediments deposited in river channel zones, play several important roles in river ecosystem functioning. Recent studies conducted in mountain rivers in temperate climates showed that wood jams effectively trap macroplastics, which can pose various risks to the organisms inhabiting them. There is no verification of similar effects in mountain rivers in other climates, where riparian vegetation, wood jam characteristics and river hydrological regime can be different. We sampled macroplastics deposited on wood jams and other surfaces within the channel of the small mountainous Mediterranean Aniene river in central Italy. Our results showed that mass of macroplastic debris trapped by wood jams exceeded those trapped by woody vegetation, herbaceous vegetation, and exposed river sediments by factors of 10, 150, and 600, respectively. These results confirm previous observations from temperate mountain rivers, indicating that wood jams act as temporary hotspots for macroplastic accumulation and potential source of its future remobilization along rivers. Based on this similarity in macroplastic-wood jam interaction, we introduced the term “plastic-wood jam” to describe a specific depositional form that links wood jams with plastic debris in plastic-polluted river systems.