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Relationship between Submerged Marine Debris and Macrobenthic Fauna in Jeju Island, South Korea
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This South Korean study examined how submerged marine debris on the seafloor around Jeju Island affects bottom-dwelling animal communities. The presence and type of debris — particularly fishing nets — altered species composition and biomass in both sandy and rocky habitats. The findings underscore that marine plastic litter restructures benthic ecosystems in ways that vary with both debris type and sediment environment.
Pollution associated with marine debris is of global ecological concern, as it threatens wildlife and local economies. Submerged marine debris alters local benthic species composition and community characteristics. The study site of Jaguri, Jeju Island, where a variety of submerged marine debris was found, was used to investigate the impact of submerged marine debris on the macrobenthic fauna of sandy and rocky substrates. The dominant macrobenthos taxon differed by sediment type; the polychaete Armandia lanceolata was dominant in sandy bottom environments and the mollusk Leiosolenus lischkei was dominant in rocky bottom environments. The presence of marine debris was associated with differences in biomass in both the soft and rocky areas. The site without debris had higher biomass in the soft area, and the site with nets had a higher density of benthic animals within the site with debris. In the rocky area. the site with debris had a higher biomass. Macrobenthos were affected by the type of deposited marine debris and the type of sediment substrate. This study provides a basis for future studies on the impact of debris on marine ecosystems and identified the benthos species affected by marine debris.
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