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Widiastuti Karim

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Author-ID : 2926758

Earth & Planetary Sciences

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Estimasi Potensi Produksi Rumput Laut di Perairan Nusa Penida Menggunakan Citra Landsat 8 Made Pande Darmawan; I Dewa Nyoman Nurweda Putra; Widiastuti Karim
Journal of Marine Research and Technology Vol 2 No 2 (2019): AGUSTUS 2019
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Seaweed is a macroalgae that has many benefits for humans, therefore to meet human needs, seaweed is developed by cultivation. One place for seaweed cultivation in Bali Province is in Nusa Penida Sub-district, which is a water conservation area in accordance with the Decree of the Minister of Marine and Fisheries / KEPMEN KKP No. 24 of 2014. The development of these areas into tourist destinations and the number of seaweed pests and diseases has caused reduced number of farmers who grow seaweed. The data used was secondary data obtained from Department of Marine and Fisheries of Bali Province and field data was taken in February 2018. Landsat 8 imagery that has been corrected by Top of Atmosphere then lyzenga algorithm was included for correction of water columns and then classified the maximum likelihood with coordinate training area, which only classified seaweed classes. The area of seaweed in Nusa Penida using Landsat 8 imagery on February 2018 acquisition was obtained at 69.48 hectares with an accuracy rate of total seaweed of 85.34% and an accuracy of 63.22%. Whereas the estimated results that could potentially be produced in February 2018 were 89,321 tons.

Konsentrasi Klorofil-a dan Hubungannya dengan Pasang Surut di Selat Lombok Annassita Gianie; Yulianto Suteja; Widiastuti Karim
Journal of Marine Research and Technology Vol 2 No 2 (2019): AGUSTUS 2019
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Lombok Strait is a strait located between Bali Island and Lombok Island that has a strong current and crossed by the main trajectory of Indonesian Throughflow (ITF). ITF is a current system that connects the Pacific and Indian Ocean. When mass water ITF passes through Indonesian waters, it mixes with other water masses, resulting in a mix of two water masses from two different oceans. These differences in water mass characteristics include temperature, salinity, DO, chlorophyll, and other tracers that can be used as an indicator of productivity. This can be determined based on the availability of chlorophyll-a concentrations. Chlorophyll-a is an active pigment in phytoplankton cells that has an important role on photosynthesis process. It is essential to know the temporal fluctuations of the chlorophyll-a concentrations at both high and low tide, and the correlation between chlorophyll-a and the water quality in the Lombok Strait. This research used primary data on chlorophyll-a and water quality parameter (DO, temperature, and salinity) and secondary data regarding tides on Port of Lembar. This research used CTD SBE 911+ as a measurement of instrument. The concentration of chlorophyll-a on CTD measurement of 0 m (0.011mg/l and 0.005) and for 10m of chlorophyll-a concentration (0.014mg/l and 0.006). The fluctuations of chlorophyll-a pattern during the tides showed that at low tide, the chlorophyll-a concentration is high, and vice versa. The chlorophyll-a was situated on a depth of 0 m and 10 m and was not affected by the water quality.

Identifikasi dan Kelimpahan Bakteri Enterococcus spp. pada Mucus Karang di Perairan Pemuteran, Bali Dewa Ayu Mira Prabaswari; I Dewa Nyoman Nurweda Putra; Widiastuti Karim
Journal of Marine Research and Technology Vol 2 No 1 (2019): FEBRUARI 2019
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Letak geografis Indonesia di area segitiga karang dunia menyebabkan tingginya jumlah jenis karang keras. Terumbu karang memiliki berbagai fungsi yaitu sebagai habitat berbagai biota laut seperti tempat pemijahan dan pelindung alamiah dari bahaya abrasi. Pencemaran domestik memiliki kontribusi yang relatif besar terhadap kerusakan terumbu karang. Aktivitas manusia dan aliran sungai membawa partikulat dari daratan berupa sedimen ataupun bahan organik yang masuk kedalam laut sehingga dapat mengakibatkan terjadinya pencemaran limbah domestik. Bakteri Enterococcus spp. adalah bakteri yang ditemukan pada limbah domestik yang dijadikan indikator pencemaran limbah domestik. Metode pengambilan sampel mucus karang dilakukan dengan metode purposive sampling, dimana penentuan ini berdasarkan keberadaan terumbu karang dan kondisi pesisir yang berbeda-beda. Pengambilan sampel mucus karang di setiap stasiun yaitu dengan memilih secara acak 3 genus karang dalam masing-masing 3 ulangan transek sabuk 20 x 2 m. Sampel mucus karang sebanyak 10 ml akan diinokulasi pada media selektif Slanetz and Bartley. Keberadaan bakteri Enterococcus spp. yang tumbuh pada media ditunjukkan dengan koloni yang tumbuh berwarna merah. Identifikasi bakteri dianalisis menggunakan analisis deskriptif, sedangkan kelimpahan bakteri dianalisis dengan Anova satu arah untuk mengetahui perbedaan kelimpahan bakteri di setiap stasiun. Hasil penelitian ini adalah bakteri Enterococcus spp. teridentifikasi di semua stasiun pengambilan sampel mucus karang yang ditandai dengan pertumbuhan koloni bakteri berwarna merah pada media selektif dan tidak terdapat perbedaan kelimpahan bakteri Enterococcus spp. antar genus karang yang berbeda di setiap stasiun pengambilan sampel yang menunjukkan pencemaran domestik tersebar merata pada semua jenis karang.

Preferensi Preferensi Pemangsaan Drupella sp. pada Jenis Karang yang Berbeda di Perairan Pemuteran, Bali Ni Wayan Gita Kanela; IGN Putra Dirgayusa; Widiastuti Karim
Journal of Marine Research and Technology Vol 1 No 1 (2018): AGUSTUS 2018
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Coral reefs are experiencing dynamic changes over time that are strongly influenced by environmental conditions and human activities. One of the natural damage to coral reefs is corallivorous gastropods such as Drupella sp. The marine tourism of Pemuteran waters on northern part of Bali is rapidly developing. However the Bio-Rock Center reported that there were 2.374 individuals of Drupella sp. found during 2008-2009 in this water. Therefore, this study aimed to determine the densities of Drupella sp. and prey preferences of Drupella sp. on coral species in Pemuteran waters. There were 4 observation sites that parallel to the shoreline at similar depths (5-6 m). The densities of Drupella sp. and prey preference were measured 2 x 20 m belt transect by using SCUBA. Live coral covers were counted in LIT (Line Intercept Transect) method. The significant difference of Drupella sp. densities among sites was analysed by using one way ANOVA, while the prey preference among corals species was identified by using Bonferroni test. The result showed that the highest abundance of Drupella sp. found at station 1 and the lowest at station 2. It is suggested that related to percentage of live coral cover as the highest was at station 1 and the lowest was at station 2.Studies revealed that Drupella sp. prey particulary on living coral. Furthermore, our observations indicated that Drupella sp. more attracted to coral Porites and Pocillopora. This prey preferences are thought to be due to the highest abundance of these corals at all study sites.

Struktur Komunitas Makroalga Di Perairan Tenggara Pulau Serangan, Bali Ni Luh Putu Ayu Sumarni; I Wayan Gede Astawa Karang; Widiastuti Karim
Journal of Marine Research and Technology Vol 2 No 2 (2019): AGUSTUS 2019
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Macroalgae is one of the biota that is found in all Indonesian waters. Macroalgae has an important role in marine ecosystems, namely as producers, ingredients and pharmacy. The purpose of this research was to determine the community structure of macroalgae. The community structures were measured by using a square transect of 1x1 m2 within a 50 m2 squared transect. Thus macroalgae were determined for its density, diversity, biomass and distribution. The differences among community structures at each station were analyzed by using the One-way Anova. The results showed that the macroalgae were classified into red, brown and green macroalgae. The highest macroalgae density wasw 21 ind/m2 and the lowest was 8 ind/m2. The diversity of macroalgae was in the medium category which the most dominant was red macroalgae. It is likely due to different ability to get the nutrients among macroalgae. The highest biomass was found in the red macroalgae while the lowest was in the green macroalgae. It might be related to the large size and weight of the thallus of red macroalgae. The One-way Anova analysis showed that there was a significant difference in macroalgae density and biomass at each station.

Co-Authors Annassita Gianie Dewa Ayu Mira Prabaswari I Dewa Nym. Nurweda P., I Wayan Gede Astawa Karang IGN Putra Dirgayusa Made Pande Darmawan Ni Luh Putu Ayu Sumarni Ni Wayan Gita Kanela Yulianto Suteja

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