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"Penelitian mengenai identifikasi keanekaragaman serta perhitungan kelimpahan mikroalga epiplastik di substrat sampah plastik makanan kemasan jenis polypropylene yang berpotensi menyebabkan Harmful Algal Blooms di lakukan di Pantai Lagoon Ancol dengan metode purposive random sampling pada 3 titik stasiun dengan metode subsample di bawah mikroskop. Tujuh belas genus mikroalga epiplastik ditemukan yang berasal dari tiga kelas, yaitu Bacillariophyceae (14 genus), Dinophyceae (1 genus), dan Cyanophyceae (2 genus) dengan 3 genus yang berpotensi toksik. Tujuh belas genus tersebut adalah Achnanthes, Cocconeis, Coscinusdiscus, Cymbela, Gyrosigma, Lyngbya, Mastogloia, Merismopedia, Navicula, Nitzschia, Paralia, Pleurosigma, Prorocentrum, Skeletonema, Stephanopyxis, Thalassionema, dan Thalassiosira. Hasil penelitian menunjukan kelimpahan total mikroalga epiplastik berkisar 249 – 24.051 sel/gram dengan kelimpahan terbesar dari genus Navicula sebesar 121.342 sel/gram dan terkecil dari genus Merismopedia sebesar 249 sel/gram. Berdasarkan perhitungan korelasi Pearson, hampir semua parameter lingkungan yang diukur berpengaruh sangat tinggi dengan rentang koefisien ± 0.80 – ± 1.00, dengan koefisien korelasi terendah oleh intensitas cahaya yaitu 0.3 dimana termasuk kedalam rentang berpengaruh rendah.

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Research on identifying diversity and calculating the abundance of epiplastic microalgae in polypropylene plastic food packaging waste substrates that have the potential to cause Harmful Algal Blooms was conducted at Ancol Lagoon Beach with purposive random sampling method at 3 station points and using the subsample method under a microscope. Seventeen genera of epiplastic microalgae were found from three classes, namely Bacillariophyceae (14 genera), Dinophyceae (1 genus), and Cyanophyceae (2 genera) with 3 potentially toxic genus. The seventeen genera are Achnanthes, Cocconeis, Coscinusdiscus, Cymbela, Gyrosigma, Lygbya, Mastogloia, Merismopedia, Navicula, Nitzschia, Paralia, Pleurosigma, Prorocentrum, Skeletonema, Stephanopyxis, Thalassionema, and Thalassiosira. The results showed that the total abundance of epiplastic microalgae ranged from 249 – 24.051 cells/gram with the greatest abundance from the genus Navicula of 121.342 cells/gram and the smallest from the genus Merismopedia of 249 cells/gram. Based on Pearson correlation calculations, almost all environmental parameters measured have a very high effect with a coefficient range of ± 0.80 – ± 1.00, with the lowest correlation coefficient by light intensity of 0.3 which is included in the low influential range."

"Mikroalga merupakan mikroorganisme eukariotik yang hidup di laut atau air tawar. Beberapa mikroalga dapat menempel pada kemasan plastik, yang umumnya ditemukan di perairan yang tercemar, dan dikenal sebagai mikroalga epiplastik. Penelitian yang dilakukan untuk mengidentifikasi keragaman serta perhitungan kelimpahan mikroalga epiplastik di kemasan makanan jenis Polypropylene dengan metode purposive sampling di Perairan Pulau Pramuka, Kepulauan Seribu. Pengambilan sampel dilakukan dari tiga titik stasiun, yaitu Utara, Barat, dan Timur Pulau Pramuka kemudian sampel diamati di bawah mikroskop. Tujuh genus mikroalga epiplastik ditemukan dari tiga kelas, yaitu Bacillariophyceae (5 genus), Dinophyceae (1 genus), dan Cyanophyceae (1 genus) yang berpotensi toksik. Genus yang ditemukan dari kelas Bacillariophyceae, yaitu Cymbella, Navicula, Nitzschia, Pleurosigma, Synedra. Cyanophyceae ditemukan dari genus Chroococcus dan Dinophyceae ditemukan dari genus Prorocentrum. 2 genus ditemukan yang memiliki potensi toksik pada perairan, yaitu Chroococcus dan Prorocentrum. Kelimpahan tertinggi ditemukan pada genus Nitzschia sebesar 3.468 sel/L, sedangkan kelimpahan terendah ditemukan pada genus Chroococcus sebesar 680 sel/L.

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Microalgae are eukaryotic microorganisms that live in the sea or fresh water. Some microalgae can stick to plastic packaging, which is commonly found in polluted waters, and are known as epiplastic microalgae. The study was conducted to identify the diversity and calculate the abundance of epiplastic microalgae in Polypropylene food packaging using the purposive sampling method in the waters of Pramuka Island, Seribu Islands. Sampling was carried out from three station points, namely North, West, and East of Pramuka Island, then the samples were observed under a microscope. Seven genera of epiplastic microalgae were found from three classes, namely Bacillariophyceae (5 genera), Dinophyceae (1 genus), and Cyanophyceae (1 genus) which are potentially toxic. The genera found from the Bacillariophyceae class, namely Cymbella, Navicula, Nitzschia, Pleurosigma, Synedra. Cyanophyceae were found from the genus Chroococcus and Dinophyceae were found from the genus Prorocentrum. 2 genera were found to have toxic potential in waters, namely Chroococcus and Prorocentrum. The highest abundance was found in the genus Nitzschia at 3,468 cells/L, while the lowest abundance was found in the genus Chroococcus at 680 cells/L."