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Exceptionally high abundances of microplastics in the oligotrophic Israeli Mediterranean coastal waters
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A coastal survey along the Israeli Mediterranean shoreline found exceptionally high microplastic concentrations — up to 1.5 million particles per square kilometer — in all samples collected. The results suggest that semi-enclosed sea basins with high population density along their shores are particularly vulnerable to microplastic accumulation.
Seasonal sea surface microplastic distribution was recorded at 17 sites along the Israeli Mediterranean coast. Microplastics (0.3-5mm) were found in all samples, with a mean abundance of 7.68±2.38particles/m or 1,518,340particles/km. Some areas had higher abundances of microplastics than others, although differences were neither consistent nor statistically significant. In some cases microplastic particles were found floating in large patches. One of these patches contained an extraordinary number of plastic particles; 324particles/m or 64,812,600particles/km. Microplastic abundances in Israeli coastal waters are disturbingly high; mean values were 1-2 orders of magnitude higher than abundances reported in other parts of the world. Light-colored (white or transparent) fragments were by far more abundant than all other microplastic colors and types. The results of this study underline the need for action to reduce the flux of plastics to the marine environment.
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A two-year study of the Bay of Marseille found microplastics in both surface waters and sediments across all seven sampling stations, with concentrations varying by season and location. Urban runoff and proximity to the coastline were associated with higher microplastic levels. The Mediterranean Sea, heavily bordered by dense populations, continues to show widespread and persistent microplastic contamination.
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