抄録
In recent years, amongst the plastics that wash up on coasts, more and more attention has been drawn to 5mm micro plastics (MP) that are wreaking havoc to the marine life by ecological concentration. Until now, tideland areas were considered to be the final destinations of waste materials, but it has been pointed out that there is a possibility of sea tides physically ravaging them, causing the waste to become smaller MP, and turning the coasts into reproduction sites from which MP outflow into the ocean. In this research, we have surveyed the amount of MP found from the coastlines to the shorelines at Takamatsu tidal flat. The result showed that MP was found only amongst the drifting wastes on the shorelines. 2000 were found within a square meter. The MPs were categorized into 7 types. From the MPs gathered, approximately 50% were fertilizer capsules.
