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All Journal JURNAL ILMIAH PLATAX
Rumampuk, Natalie Detty C.
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Environmental Science

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Isolation and Potential of Plastic-Degrading Bacteria from Plastic Waste Fatti, Clara; Rumampuk, Natalie Detty C.; Gerung, Grevo Soleman; Wullur, Stenly; Mamuaja, Jane Marianne; Ginting, Elvy Like
Jurnal Ilmiah Platax Vol. 13 No. 1 (2025): ISSUE JANUARY-JUNE 2025
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v13i1.58358

Abstract

Plastic waste is an environmental issue, including in marine environments. One method of managing plastic waste is through biodegradation using bacteria. This study aims to isolate bacteria from plastic waste in Malalayang, and North Sulawesi waters, and test their potential to degrade plastic using laboratory experimental methods. Bacteria were isolated using a Nutrient Agar (NA) medium and then tested for their ability to degrade plastic using a Nutrient Broth (NB) medium containing plastic fragments. The NB medium with plastic fragments was incubated using an orbital shaker at room temperature with agitation at 130 rpm for 30 days. Five bacterial isolates were successfully obtained from plastic waste: isolates C1, C2, C3, C4, and C5. Four of the bacterial isolates were found to be capable of degrading plastic, as indicated by the reduction in the dry weight of the plastic after 30 days of incubation. The highest plastic weight reduction was shown in isolate C2, with a decrease of 2.95%, while the lowest reduction was observed in isolate C4, with a decrease of 2%. Keywords: Bacteria, Isolation, Biodegradation, Plastic. Abstrak Sampah plastik merupakan masalah lingkungan termasuk lingkungan laut. Salah satu pengelolaan sampah plastik adalah melalui biodegradasi menggunakan bakteri. Penelitian ini bertujuan mengisolasi bakteri dari sampah plastik Perairan Malalayang, Sulawesi Utara dan melakukan uji potensi bakteri tersebut dalam mendegradasi plastik menggunakan metode eksperimen laboratorium. Bakteri diisolasi menggunakan medium Nutrient Agar (NA), kemudian diuji kemampuan mendegradasi plastik dengan menggunakan medium Nutrient Broth (NB) yang berisi potongan plastik. Medium NB berisi potongan plastik diinkubasi menggunakan orbital shaker pada suhu ruang dengan agitasi 130 rpm selama 30 hari. Lima isolat bakteri berhasil diisolasi dari sampah plastik, yaitu isolat C1, C2, C3, C4 dan C5. Didapatkan empat isolat bakteri yang mampu mendegradasi plastik, yang ditunjukkan dengan pengurangan berat kering plastik setelah diinkubasi selama 30 hari. Pengurangan berat plastik tertinggi ditunjukkan oleh isolat C2 sebesar 2,95 %, sedangkan pengurangan berat terendah oleh isolat C4 sebesar 2 %. Kata kunci: Bakteri, Isolasi, Biodegradasi, Plastik.
Indicator Species and Diversity in Mangroves at Darunu Mangrove Park Mahmud, Maudy Rusmini; Rumengan, Antonius; Paruntu, Carolus Paulus; Schaduw, Joshian Nicolas William; Rumampuk, Natalie Detty C.; Warouw, Veibe
Jurnal Ilmiah Platax Vol. 13 No. 1 (2025): ISSUE JANUARY-JUNE 2025
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v13i1.59128

Abstract

Mangrove ecosystems play a crucial role in maintaining the ecological balance of coastal areas, including protection against abrasion, providing habitat for marine species, and acting as a carbon sink. This study aims to identify indicator species and analyze biodiversity in Darunu Mangrove Park, Darunu Village, Wori Subdistrict, North Minahasa Regency. The research was conducted over three months (May–July 2024) using a line transect method for vegetation data collection. The results show that three dominant mangrove species were identified: Rhizophora apiculata, Rhizophora mucronata, and Sonneratia alba. R. mucronata exhibited significant dominance, both in terms of mature trees and saplings, and had the highest Important Value Index (IVI). The mangrove species diversity in this area is classified as low, with the. Diversity Index (H’) indicates an imbalance in the ecosystem's species composition. The Dominance Index (C) and Evenness Index (E) analyses indicate strong dominance by certain species, particularly R. mucronata. This study recommends the importance of enhanced monitoring and more intensive conservation efforts, including the replanting of threatened mangrove species and raising community awareness of mangrove ecosystem conservation. Keywords: Darunu Mangrove Park, Diversity, Indicator Species, Important Value Index.   Abstrak   Ekosistem mangrove memiliki peran penting dalam menjaga keseimbangan ekologi pesisir, meliputi perlindungan terhadap abrasi, penyedia habitat bagi spesies laut, dan sebagai penyerap karbon. Penelitian ini bertujuan untuk mengidentifikasi spesies indikator dan menganalisis keanekaragaman hayati di Darunu Mangrove Park, Desa Darunu, Kecamatan Wori, Kabupaten Minahasa Utara. Penelitian dilaksanakan selama tiga bulan (Mei-Juli 2024) dengan menggunakan metode transek garis untuk pengambilan data vegetasi. Hasil penelitian menunjukkan bahwa terdapat tiga jenis mangrove dominan, yaitu R. apiculata, R. mucronata, dan S. alba. Jenis R. mucronata menunjukkan dominasi yang signifikan, baik pada tingkat pohon maupun pancang, serta memiliki nilai Indeks Nilai Penting (INP) tertinggi. Keanekaragaman jenis mangrove di kawasan ini tergolong rendah dengan Indeks Keanekaragaman (H’) menunjukkan ketidakseimbangan spesies dalam ekosistem. Analisis Indeks Dominansi (C) dan Indeks Kemerataan (E) mengindikasikan adanya dominasi yang kuat dari beberapa spesies tertentu, terutama R. mucronata. Penelitian ini merekomendasikan pentingnya pemantauan dan upaya konservasi yang lebih intensif, termasuk penanaman kembali spesies mangrove yang terancam dan peningkatan kesadaran masyarakat terhadap pelestarian ekosistem mangrove. Kata kunci: Darunu Mangrove Park, Indeks Nilai Penting, Keanekaragaman, Spesies indicator
Co-Authors Antonius Rumengan Carolus Paulus Paruntu Fatti, Clara Ginting, Elvy Like Grevo S Gerung Joshian N.W. Schaduw Mahmud, Maudy Rusmini Mamuaja, Jane Marianne Stenly Wullur Veibe Warouw