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"ABSTRAKIntroduksi spesies asing merupakan ancaman bagi banyak organisme perairan. Deteksi dini dapat meningkatkan keberhasilan usaha pengendalian spesies asing, namun saat ini belum ada metode konvensional yang mampu melakukan hal tersebut. Pendekatan terbaru menggunakan environmental DNA eDNA mulai digunakan sebagai pendukung metode survey konvensional, terutama di daerah beriklim sedang temperate. Suhu yang lebih rendah diperkirakan dapat mempertahankan keberadaan DNA di dalam air. Penelitian ini dilakukan untuk menguji metode eDNA di daerah beriklim tropis untuk mendeteksi spesies asing alligator gar Atractosteus spatula dilakukan di Depok, Indonesia. Sebanyak 200 ml sampel air diambil dari kolam artifisial setiap tujuh hari selama satu bulan, lalu difiltrasi melalui kertas filter nitrat selulosa berdiameter 0,45. Sampel diekstraksi berdasarkan protokol kit FastDNA Spin Kit for Soil. Sampel kemudian diamplifikasi dengan primer ecoPrimer yang memiliki gen target 12S rRNA, lalu dikuantifikasi dan dilakukan sekuensing. Hasil penelitian menunjukkan bahwa eDNA terdeteksi di tiga dari empat sampel air dan mengindikasikan bahwa metode eDNA dapat dipertimbangkan sebagai metode pendukung bagi metode survey konvensional. Meskipun demikian, penelitian lebih lanjut diperlukan sebelum mengaplikasikan metode tersebut di lapangan.

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ABSTRACTIntroduction of non native species threatens the life of many aquatic organisms. Successful eradication requires early detection, but currently no traditional monitoring technique offer the quality to do so. New approach using environmental DNA eDNA begins to be used to complement the more traditional monitoring methods. Most of eDNA studies were carried out in temperate areas, as the cooler temperature preserve the DNA better. This study aims to test the applicability of eDNA method in detecting alligator gar Atractosteus spatula from an artificial pond in Depok, Indonesia. 200 mL water samples was taken every seven days in a month before being filtered through 0,45 nitrate cellulose filter. DNA was isolated using FastDNA Spin Kit for Soil for the subsequent PCR process. Samples were then amplified using ecoPrimer which targeted 12S rRNA gene and quantified using spectrophotometer and electrophoresis, and sequenced. The study showed that eDNA was detected in three out of four samples, and therefore should be considered to complement the more traditional monitoring methods. However, further study is still needed before this method can be widely applied in the field."

"ABSTRAKPemantauan spesies asing invasif berperan penting dalam mempelajari konservasi dan pengendalian ekosistem perairan. Alligator gar merupakan salah satu spesies asing yang masuk ke dalam perairan Indonesia dan berpotensi invasif. Sifatnya yang kriptik menyebabkan spesies ini sulit diamati secara visual. Metode eDNA hadir sebagai alternatif untuk deteksi spesies. Namun penelitian eDNA umumnya dilakukan di daerah beriklim subtropis. Pengembangan metode eDNA di daerah tropis dilakukan dengan menggunakan sedimen kolam artifisial untuk deteksi alligator gar. Sedimen diharapkan mampu melindungi eDNA dari degradasi akibat faktor lingkungan. Pengambilan sampel dilakukan empat kali dalam sebulan dengan mengeruk langsung lapisan sedimen sebanyak 500 mg dan diisolasi menggunakan Fast DNA Spin Kit for Soil. Hasil spektrofotometri menunjukkan konsentrasi terbesar yaitu 204,37 ng/ L pada sampel 1. Suhuannealing telah dioptimasi yaitu 53.4 C menggunakan ecoPrimer dengan gen target 12SrRNA, pita paling jelas ditunjukkan oleh sampel 4 dengan ukuran amplikon 115 bp. Hasil blastn menunjukkan kekerabatan tertinggi pada dua spesies yaitu A. tropicus dan A.spatula, mengindikasikan bahwa sampel sedi mendapat digunakan untuk deteksi alligator gar A. spatula.

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ABSTRACTMonitoring of alien invasive species plays an important role in management and preservation of natural ecosystem. Alligator gar is an alien species in Indonesia swater and potentially invasive. Its cryptic and solitary nature makes visual detection difficult, there fore can not be monitored using traditional method. Recent advances studies have produced technology called eDNA, which allows species detection by using environmental samples such as water, sediment or soil. However, this study often carried out in subtropical area. Development of eDNAin tropical aquatic was performed by using sediment to detect alligator gar. Insediment, the persistance of eDNA can be much longer due to slow rate of degradation. Sample collection was done four times in artificial pond by dredging 500 mg of sediment for each sample. Samples were processed directly using FastDNA Spin Kit for soil. Electrophoresis and spectrophotometry results show edall samples positive containing eDNA, the largest concentration 204,37 ng Lbelong to sample 1. Annealing temperature was optimized at 53.4 C by using ecoPrimer with target region 12 SrRNA, the clearest band shown by sample 4, with the size 115 bp. Blastn result showed the highest similarity with two species A. tropicus and A.spatula. The result was indicating that eDNA contained insediment samples allows for detection of alligator gar A. spatula."