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All Journal METAMORFOSA Journal of Biological Sciences Jurnal Biologi Udayana Bumi Lestari Ecotrophic, Journal of Environmental Science SIMBIOSIS

Joko Wiryatno

Jurusan Biologi F.MIPA Universitas Udayana, Bukit Jimbaran - Bali

Author-ID : 2925686

Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Energy Environmental Science Immunology & microbiology

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THE POTENTIAL OF CHITINASE ENZYMES PRODUCED BY CHITINOLYTIC BACTERIA ISOLATED FROM SHRIMP SHELLS AS BIOCONTROL CANDIDATES IN CONTROLLING PLANT PESTS Faldy Efriant Pangemanan; Ida Bagus Gede Darmayasa; Joko Wiryatno
SIMBIOSIS Vol 8 No 1 (2020)
Publisher : Jurusan Biologi Universitas Udayana

Plant pests is one of the problem in agriculture sector that can cause decreasing of harvest productivity. Plant pest invasion will be increased in rainy season, so it need to be controlled. Biological control by chitinolytic bacteria is one of many ways to avoid the using of chemical pesticide. The purpose of this research to find the type of chitinolytic bacteria and utilizing the enzyme chitinase as plant pest biocontrol. Test has been done with spray method of 5 mL with 10%, 20%. 30%, 40% and 50% concentration with 7 treatments include positive and negative controls and 3 repetition. Observation of larva death done for 24 hours after spray, where every 6 hours observations are made. Pseudomonas is a genus that has been identified as chitinolytic bacteria. Larva death is indicated by with percentage result insignificant death which is shown at the 10 – 30% concentration. The percentage result significant death which is shown at the 40 – 50% concentration. 40% and 50% is most effective concentration in killing fruit fly (Drosophila sp.).

INVENTORY SNAKES AROUND SANUR AND PADANG GALAK BEACH I Gusti Putu Ayunda Pratiska; Ida Bagus Made Suaskara; Joko Wiryatno; I Gede Agus Pradana Putra
SIMBIOSIS Vol 5 No 2 (2017)
Publisher : Jurusan Biologi Universitas Udayana

Sea snakes have a strong venom and when they bite can be fatal for humans, whereas snakes found in mangrove areas are weak venomous snakes and non-venomous snakes (McKay, 2006). The low understanding public aboutthe snakes has led to the assumption that any snakes found are dangerous, so research needs to be done in order to provide information on the types of venomous and non-venomous snakes present in coastal areas and around mangrove forest areas. This research was conducted from early January to the end of January located around Merta Sari Beach to Padang Galak. The method used is the method of cruising method is done by determining the habitat that is likely suitable for snake habitat (Asad et al., 2011). Data collected in the morning and at night, by capturing and identifying snakes found in situ refers to the snake identification titled '107+ Ular Indonesia' (Riza Marlon, 2014), and the book 'Reptiles and Amphibians in Bali 'By Mckay (2006). Based on the results of the study, snakes found around Merta Sari Beach and Padang Galak Beach numbered 61 individual snakes with two different families namely Colubridae and Elapidae. Snake species of the Colubridae family found are Dog-faced Water Snake (Cerberus rynchops) and the Elapidae family is the Erabu/Yellow-lipped Sea Krait (Laticauda colubrina) snake

JENIS DAN DENSITAS BULU BABI (ECHINOIDEA) DI KAWASAN PANTAI SANUR DAN SERANGAN DENPASAR- BALI Ni Luh Eka Wulandewi; Job Nico Job Nico Subagio; Joko Wiryatno
SIMBIOSIS Vol 3 No 1 (2015)
Publisher : Jurusan Biologi Universitas Udayana

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This aimed this study were to identify the species and the density of sea urchin at Sanur andSerangan beach. The research was conducted from Desember 2013 – February 2014. Thesamples were collected from area of Sanur beach, Merta Segara beach, Mertasari beach andSerangan beach, by using transect method within 5 m x 5 m. Speciesmens were identified atLaboratory of Ecology and the Laboratory of Animal Taxonomy at Department of Biology,Faculty of Science and Mathematics, University of Udayana. There 12 species of sea urchin werefound, that are Clypeaster sp., Astropyga radiata, Diadema palmeri, Diadema savignyi,Diadema setosum, Echinothrix calamaris, Echinometra mathaei, Heterocentrotus sp., Maretiaplanulata, Temnopleurus sp., Toxopneustes sp. and Tripneustes gratilla from 6 different family.The highest density of sea urchin are 0,373 individual/m2 was found which were at Seranganbeach, and the lowest density of sea urchin are 0,144 individual/m2 was found at Mertasaribeach.Keywords: Sea urchin species, density

JENIS DAN KEPADATAN TERIPANG (Holothuroidea) DI PANTAI BALI SELATAN Ni Putu Mery Yanti; Job Nico Subagio; Joko Wiryatno
SIMBIOSIS Vol 2 No 1 (2014)
Publisher : Jurusan Biologi Universitas Udayana

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The research wasaimed to theidentifyspecies and density of sea cucumbers at southernbeach of Bali are Mertasari beach, Segara beach, and Mengening beach. The identification ofspecies was conducted in the Laboratorium of EcologyDepartment of Biology, Faculty ofNatural Science and Mathematics, University of Udayana from December 2013 toJanuary 2014.A size of 1 x 1m quadrat squaretransect sampling method was employed in this research.Identification of sea cucumbers was performed based on their morphology and shape ofspicules. GSIwas used to observed reproductionphase of sea cucumber.Two species of seacucumbers found ware Holothuria atra and Holothuria sp. Holothuria atra was found atMertasari beach, Sanur village, southern of Denpasar and Segara beach, Tuban, Kuta, Badungwhile Holothuria sp. was faound atMengening beach. Segara beach showed the highestdensityof4.333 individual/m2,while Mertasari beach showed the lowest density 0.875individual/m2. GSI Value ofMertasari, Segara, andMengening beach showed the activationofphase ofI andII.Keywords: Holothuroidea, species, sea cucumber, density, GSI

Co-Authors Ahmad Subhan Anak Agung Gde Raka Dalem Deny Suhermawan Yusup Dionisius Darmawan Sutanto Faldy Efriant Pangemanan Husnayati Hartini I Gede Agus Pradana Putra I Gusti Ayu Sugi Wahyuni I Gusti Putu Ayunda Pratiska I Wayan Arthana I.P.G Ardhana Ida Bagus Gede Darmayasa Ida Bagus Made Suaskara IRIANI SETYAWATI Job Nico Subagio Lalu Samsul Rizal MADE SUSUN PARWANAYONI N.K Mardani Ngurah Intan Wiratmini Ni Luh Eka Wulandewi Ni Putu Mery Yanti ROLINDA INNEKE FOENAY Timothy Herman Laning

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