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Convergence zones of coastal waters as hotspots for floating microplastic accumulation. | LitMetric

Convergence zones of coastal waters as hotspots for floating microplastic accumulation.

Mar Pollut Bull

Seto Inland Sea Regional Research Center, Kagawa University, Saiwai, Takamatsu, Kagawa 760-0016, Japan; Faculty of Agriculture, Kagawa University, Ikenobe, Miki, Kagawa 761-0701, Japan.

Published: September 2024

AI Article Synopsis

Article Abstract

This study examines microplastic (MP, 1-5 mm) densities in convergence zones in a coastal sea, the Seto Inland Sea, comparing them to those of non-convergence zones and other areas. Notably, Seto convergence zones exhibit MP densities 40 to 300 times higher than non-convergence zones, with an extraordinary density of 3.7 ± 6.3 pieces m, similar to densities found in Tokyo Bay as known a MP hotspot. The predominant polymer found was expanded polystyrene, varying seasonally and peaking in summer. Juvenile fish associated with driftweed in these convergence zones face a risk of long-term MP exposure, potentially up to four months. This large number of MPs found in coastal convergence zones is similar to accumulation zones formed in the gyres of open oceans, with strong implications for detrimental effects on coastal marine life. However, these MPs are autochthonous, and may be manageable through local marine plastic waste management.

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Source
http://dx.doi.org/10.1016/j.marpolbul.2024.116691DOI Listing

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