MIKROPLASTIK PADA KONTINUM AIR TAWAR–ESTUARI–PESISIR: PENYIMPANAN TERSEMBUNYI, REMOBILISASI, DAN RISIKO EKOLOGIS
DOI:
https://doi.org/10.35334/58wzc075Keywords:
penyerap tersembunyi mikroplastik, kontinum sungai–estuari–pesisir, remobilisasi sedimen, paparan bentik, risiko ekologisAbstract
Mikroplastik umumnya dipandang sebagai partikel yang terangkut dari daratan melalui sungai dan estuari menuju laut, tetapi pandangan seperti sabuk konveyor ini meremehkan pentingnya penyimpanan di dalam sedimen, dataran banjir, waduk, zona hiporeik, lahan basah pasang surut, maksimum kekeruhan estuari, habitat bervegetasi, dan endapan pesisir dangkal. Tinjauan naratif ini mensintesis bukti terbaru mengenai “penyerap tersembunyi” tersebut dan berargumen bahwa sebagian besar bukan merupakan tempat penyimpanan terminal, melainkan kompartemen penyimpanan dinamis yang signifikansi ekologisnya bergantung pada waktu retensi, transformasi partikel, probabilitas remobilisasi, dan tumpang tindih dengan aktivitas biologis. Di sistem air tawar, hidromorfologi, bendungan, sedimen halus, vegetasi, dan pertukaran hiporeik menciptakan retensi selektif, sedangkan banjir dan operasi pengelolaan sedimen dapat membalik perilaku penyerap. Estuari berfungsi sebagai penyaring semipermeabel tempat pasang surut, gradien salinitas, bahan partikulat tersuspensi, agregasi, dan biofouling berulang kali memindahkan partikel antara air dan sedimen dasar. Teluk pesisir, mangrove, rawa asin, padang lamun, dan sedimen dekat pantai selanjutnya mendistribusikan ulang, bukan sekadar mengakhiri, perjalanan mikroplastik yang dibawa sungai. Pengukuran terbaru menunjukkan bahwa penyimpanan dapat sangat besar, tetapi juga mengungkap bias metodologis akibat ukuran mata jaring, kedalaman pengambilan sampel, batas ukuran partikel, identifikasi polimer, dan konversi antara jumlah partikel dan massa. Karena itu, risiko ekologis terlepas dari kelimpahan sesaat di kolom air: paparan bentik, penuaan partikel, interaksi kokontaminan, perkembangan plastisfer, bioturbasi, dan transfer trofik dapat meningkatkan risiko di zona deposisional berfluks rendah. Kami mengusulkan kerangka penyimpanan–reaktivasi–paparan yang membedakan hotspot transportasi dari hotspot paparan dan memperlakukan penyerap tersembunyi sebagai reservoir yang bergantung pada keadaan. Pemantauan masa depan perlu menggabungkan inventaris teresolusi kedalaman, pengambilan sampel berbasis kejadian, kronologi sedimen, pengukuran hidrodinamika, analisis teresolusi polimer, dan ambang efek yang relevan secara biologis untuk meningkatkan neraca sumber-ke-laut dan penilaian risiko.
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