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All Journal LIMNOTEK - Perairan Darat Tropis di Indonesia Life Science
Nina Hermayani Sadi, Nina Hermayani
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Environmental Science

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BEBERAPA ASPEK BIOLOGIS UDANG ALAM DANAU SENTANI, PAPUA Said, Djamhuriyah S.; Sadi, Nina Hermayani
LIMNOTEK - Perairan Darat Tropis di Indonesia Vol 25, No 2 (2018)
Publisher : Research Center for Limnology

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Abstract

Abstrak ( Bahasa Indonesia )     Udang berfungsi sebagai penyeimbang ekologis dalam suatu bentuk ekosistem perairan.Hilangnya komponen (udang) dapat mengganggu kestabilan ekologis suatu ekosistem seperti halnya  ekosistem sebuah danau. Danau Sentani yang terletak di Provinsi Papua Indonesia, merupakan salah satu danau yang unik dan menarik untuk ditelaah.   Penelitian yang dilakukan di tahun 2014 menelaah kondisi produktivitas  danau tersebut, khususnya dilihat dari kondisi udang yang terdapat di dalamnya. Pengambilan conto udang dilakukan dalam dua periode yaitu Bulan April dan September-Oktober 2014. Ditemukan 2 jenis udang alami asli Indonesia yaitu Macrobrachium minutum yang bersifat murni air tawar dan endemis D. Sentani. Kondisinya terancam punah dan populasi yang sangat sedikit. Selain itu ditemukan udang Caridina gracilipes yang relatif kosmopolitan dan mendominasi. Kedua jenis udang diduga mampu bereproduksi sepanjang tahun dengan  puncak pemijahan pada musim hujan. Untuk mempertahankan jenis-jenis endemis maupun jenis asli, maka Danau Sentani perlu dikelola dengan baik.Kata kunci : aspek biologis, Danau Sentani, udang alam asli  Abstract ( Bahasa Inggris)SOME BIOLOGICAL ASPECT OF NATURAL SHRIMP OF LAKE SENTANI, PAPUA. Shrimp is an ecological balancing component of an aquatic ecosystems. Loss of the component could disrupt the ecosystem such as a lake ecosystem. Lake Sentani located in Papua Province Indonesia, is one of the unique lake and interesting to be studied. Research was conducted in 2014 to study the condition of the productivity of the lake, especially the shrimps condition.  Shrimp sampling was done in two periods, on April and September-October 2014. There were  found 2 types of natural shrimp native of Indonesia is Macrobrachium minutum that is pure fresh water and endemic D. Sentani. The shrimp is endangered and the population is very small. In addition found shrimp Caridina gracilipes are relatively cosmopolitan and dominate. Both types of shrimp are thought to be able to reproduce throughout the year with peak spawning in the rainy season. To maintain the endemic   and native specieses, Lake Sentani needs to be well managed.Keywords: biological aspects, Lake Sentani, native shrimps
ISOLASI BAKTERI HETEROTROF DI SITU CIBUNTU, JAWA BARAT DAN KARAKTERISASI RESISTENSI ASAM DAN LOGAM Kurnia, Kesi; Sadi, Nina Hermayani; Jumianto, Syafitri
Life Science Vol 5 No 1 (2016): April 2016
Publisher : Universitas Negeri Semarang

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Bakteri heterotrofik sangat berperan penting dalam sistem perairan karena kemampuan aktivitas metabolismenya. Mereka berinteraksi dengan logam dan mineral dalam lingkungan alam dan sintetis, mengubah keadaan fisik dan kimianya, logam dan mineral tersebut juga dapat mempengaruhi aktivitas, pertumbuhan dan kelangsungan hidup bakteri. Penelitian ini bertujuan untuk mengisolasi dan mengkarakterisasi bakteri resisten logam dan asam di Situ Cibintu, Cibinong, Jawa Barat. Sampel air diambil dari 3 titik di Situ Cibuntu dan dianalisa distribusi bakteri haterotrofiknya. Isolat bakteri ditanam di media Triptone Glucose Yeast (TGY). Selanjutnya dilakukan resistensi terhadap logam timbal (Pb) dan asam. Hasil penelitian menunjukkan bahwa jumah bakteri heterotrof di Situ Cibuntu sebanyak 3.5x103 cfu mL-1. Mayoritas (73%) isolat bakteri resisten terhadap logam dan sebanyak 47% resisten terhadap asam (pH 4). Bakteri yang resisten didominasi oleh Gram negatif. Penelitian ini memberikan pengetahuan mengenai kemampuan adaptasi bakteri heterotrof pada lingkungan logam dan asam. Heterotrophic bacteria play an important role in aquatic systems because of their ability of metabolic activities. They interact with metals and minerals in natural and synthetic environments, altering their physical and chemical state, with metals and minerals also able to affect activity, microbial growth and survival. The study aim to isolate and characterize the lead (Pb) and acid resistant of heterotrophic bacteria strains isolated from pond Cibuntu, Cibinong, West Java. Water samples were collected from three points around pond Cibuntu and analyzed the distribution of heterotrophic bacteria. The bacterial isolates were screened on Triptone Glucose Yeast (TGY) agar plates. Lead (Pb) metal and acidic tolerance were tested. In the present study, the population density of heterotrophic bacteria were recorded 3.5x103 cfu mL-1. The majority (73%) of bacteria isolates were resistant to lead and 47% to acid (pH 4). The most abundant type of bacteria resistant was Gram negative. This experiment provides the base to link the adaptation capabilities of heterotrophic bacteria in metal and acid environment.
Co-Authors Kesi Kurnia, Kesi Said, Djamhuriyah S. Syafitri Jumianto, Syafitri