Dietriech Geoffrey Bengen
Marine Sciences Department, Faculty of Fisheries and Marine Sciences, Bogor Agricultural University, Bogor, Indonesia Jln. Agatis, Kampus IPB Dramaga Bogor 16680 Indonesia

Published : 19 Documents
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SHALLOW-WATER HABITAT CHANGE DETECTION OF KALEDUPA ISLAND, WAKATOBI NATIONAL PARK (WNP) FOR 14 YEARS Al Azhar, Al Azhar; Damar, Ario; Bengen, Dietriech Geoffrey; Atmadipoera, Agus
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 10 No. 2 (2018): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.v10i2.21316

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Metode penginderaan jauh sangat membantu dalam pemetaan kondisi habitat perairan dangkal secara spasial pada cakupan area yang luas. Penelitian ini bertujuan untuk menganalisis perubahan habitat perairan dangkal Pulau Kaledupa, Taman Nasional Wakatobi (TNW), selama 14 tahun, dari tahun 2002 hingga 2016. Data citra yang digunakan dalam penelitian ini adalah Landsat 8 OLI (2016), Landsat 5TM (2009), dan Landsat 7ETM+ (2002), yang dikombinasikan dengan data in-situ dan TNW. Klasifikasi Mahalanobis dimanfaatkan untuk memproduksi peta habitat perairan dangkal (karang hidup, karang mati, lamun, dan pasir) dan mendeteksi perubahannya. Hasil yang diperoleh bahwa perubahan yang terjadi dari tahun 2002 sampai 2016 adalah tutupan karang hidup menurun dari 2217 ha menjadi 2039 ha, tutupan karang mati juga menurun dari 3327 ha menjadi 2108 ha, luas pasir meningkat dari 1201 ha menjadi 1346 ha, area lamun naik dari 4130 ha menjadi 5294 ha. Metode ini merupakan alat analisis yang baik untuk menilai efektivitas upaya perlindungan ekosistem terumbu karang dan lamun di perairan Pulau Kaledupa, serta dapat diterapkan pada 3 pulau utama lainnya di TNW dan pulau-pulau kecil di Indonesia.
KARAKTER MORFOMETRIK DAN ASOSIASI TUNA SIRIP KUNING THUNNUS ALBACARES DAN TUNA BAMBULO GYMNOSARDA UNICOLOR (RUPPELL) DI PERAIRAN SIMEULUE, PROVINSI ACEH Burhanis, Burhanis; Bengen, Dietriech Geoffrey; Baskoro, Mulyono Sumitro
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 10 No. 2 (2018): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.v10i2.19607

Abstract

Pulau Simeulue yang dikelilingi oleh terumbu tepi, secara geografis termasuk ke dalam wilayah Kabupaten Simeulue yang berbatasan langsung dengan Samudera Hindia. Tuna sirip kuning Thunnus albacares dan tuna bambulo Gymnosarda unicolor merupakan jenis epipelagik yang potensial di perairan Simeulue. Kedua jenis tuna ini belum banyak dipelajari karakter bio-ekologinya. Penelitian ini penting dilakukan untuk mengetahui karakter morfometrik dan mengkaji asosiasi spesifik tuna di perairan Simeulue. Penelitian dilakukan pada bulan Februari 2017, dengan metode pengamatan dan pengukuran langsung tuna hasil tangkapan nelayan yang menggunakan alat tangkap pancing ulur, dan selanjutnya dianalisis dengan menggunakan analisis komponen utama (principal component analysis) dan analisis cluster. Hasil tangkapan tuna sirip kuning sebanyak 85 ekor dengan kelas ukuran 35-105 cm dan sebanyak 189 ekor tuna bambulo dengan kelas ukuran 40-110 cm. Karakter morfometrik tuna sirip kuning dan tuna bambulo yang didominasi ukuran besar terdapat di stasiun Teupah Selatan, dan dominasi ukuran kecil di stasiun Simeulue Timur. Asosiasi spesifik tuna sirip kuning dan tuna bambulo pada tingkat similaritas 80,0% membentuk 3 (tiga) kelompok.
SPATIAL PROJECTION OF LAND USE AND ITS CONNECTION WITH URBAN ECOLOGY SPATIAL PLANNING IN THE COASTAL CITY, CASE STUDY IN MAKASSAR CITY, INDONESIA Amri, Syahrial Nur; Adrianto, Luky; Bengen, Dietriech Geoffrey
International Journal of Remote Sensing and Earth Sciences (IJReSES) Vol 14, No 2 (2017)
Publisher : National Institute of Aeronautics and Space of Indonesia (LAPAN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.ijreses.2017.v14.a2715

Abstract

The arrangement of coastal ecological space in the coastal city area aims to ensure the sustainability of the system, the availability of local natural resources, environmental health and the presence of the coastal ecosystems. The lack of discipline in the supervision and implementation of spatial regulations resulted in inconsistencies between urban spatial planning and land use facts. This study aims to see the inconsistency between spatial planning of the city with the real conditions in the field so it can be used as an evaluation material to optimize the planning of the urban space in the future. This study used satellite image interpretation, spatial analysis, and projection analysis using markov cellular automata, as well as consistency evaluation for spatial planning policy. The results show that there has been a significant increase of open spaces during 2001-2015 and physical development was relatively spreading irregularly and indicated the urban sprawl phenomenon. There has been an open area deficits for the green open space in 2015-2031, such as integrated maritime, ports, and warehousing zones. Several islands in Makassar City are predicted to have their built-up areas decreased, especially in Lanjukang Island, Langkai Island, Kodingareng Lompo Island, Bone Tambung Island, Kodingareng Keke Island and Samalona Island. Meanwhile, the increase of the built up area is predicted to occur in Lumu Island, Barrang Caddi Island, Barrang Lompo Island, Lae-lae Island, and Kayangan Island. The land cover is caused by the human activities. Many land conversions do not comply with the provision of percentage of green open space allocation in the integrated strategic areas, established in the spatial plan. Thus, have the potential of conflict in the spatial plan of marine and small islands in Makassar City.
CARBON STORED ON SEAGRASS COMMUNITY IN MARINE NATURE TOURISM PARK OF KOTANIA BAY, WESTERN SERAM, INDONESIA Wawo, Mintje; Wardiatno, Yusli; Adrianto, Luky; Bengen, Dietriech Geoffrey
Jurnal Manajemen Hutan Tropika Vol. 20 No. 1 (2014)
Publisher : Institut Pertanian Bogor (IPB University)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (521.921 KB) | DOI: 10.7226/jtfm.20.1.51

Abstract

Currently, the function of seagrass community as carbon storage has been discussed in line with ?blue carbon? function of  that seagrass has. Seagrass bed are a very valuable coastal ecosystem, however, seagrass bed is threatened if compared to other coastal ecosystems, such as mangroves and coral reefs.  The threatened seagrass experienced also contributes to its capacity in absorbing CO2 emission from greenhouse gasses such as CO2 emission Temporal estimation  shows that CO2 emission will increase in the coming decade. On the other side, efforts to decrease climate change  can be influenced  by the  existence of seagrass.  Informations about existence of seagrass as carbon storage are still very rare or limited. This study was aimed to estimate carbon storage on seagrass community  in Marine Nature Tourism Park of Kotania Bay Area, Western  Seram,  Maluku Province. The  quadrat transect method of 0.25 m2 for each plot was used to collect seagrass existence. The content of carbon in the sample of dry biomass of seagrass was analyzed in the laboratory using Walkley & Black method. The results  showed that total carbon stored was higher in both Osi and Burung Islands of Kotania Bay  than other studied areas (Buntal and  Tatumbu Islands, Marsegu Island, Barnusang Peninsula, Loupessy and  Tamanjaya Village).    The average  carbon stored in  Kotania Bay waters was 2.385 Mg C ha-1,  whereas the total of carbon stored was 2054.4967 Mg C.
Perencanaan Kawasan untuk Pengembangan Ekowisata Perairan di Teluk Weda Maluku Utara Djamhur, Martini; Mennofatria, Boer; Bengen, Dietriech Geoffrey; Fachrudin, Achmad
TATALOKA Vol 16, No 2 (2014): Volume 16 Number 2, May 2014
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (587.961 KB) | DOI: 10.14710/tataloka.16.2.70-83

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Weda Bay is a bay area which several resources likes renewable resources and unrenewable resources. This condition makes to develop Weda Bay as potential area, need zonation to arrange and make sustainable development. Water ecotourism as sustainable development  is one of activity which can combine ecology and economic aspect. Based on this fact to development water ecotourism in Weda Bay, need to estimating suitablity area. Referring to Yulianda et. al (2010), suitabilty analysis for water ecotourism has done.Result showed Weda bay has suitable area for diving tourism as 488,8427 Ha; snorkeling tourism as 551,3737 Ha; beach tourism as 151,1329 Ha; mangrove tourism as 620,1251 Ha and seaweed tourism as 32,1399 Ha.Weda Bay is a bay area which several resources likes renewable resources and unrenewable resources. This condition makes to develop Weda Bay as potential area, need zonation to arrange and make sustainable development. Water ecotourism as sustainable development  is one of activity which can combine ecology and economic aspect. Based on this fact to development water ecotourism in Weda Bay, need to estimating suitablity area. Referring to Yulianda et. al (2010), suitabilty analysis for water ecotourism has done.Result showed Weda bay has suitable area for diving tourism as 488,8427 Ha; snorkeling tourism as 551,3737 Ha; beach tourism as 151,1329 Ha; mangrove tourism as 620,1251 Ha and seaweed tourism as 32,1399 Ha.
THE DISTRIBUTION AND ABUNDANCE OF BLACK BAND DISEASE AND WHITE SYNDROME IN KEPULAUAN SERIBU, INDONESIA Johan, Ofri; Bengen, Dietriech Geoffrey; Zamani, Neviaty Putri; Suharsono, .; Sweet, Michael John
HAYATI Journal of Biosciences Vol. 22 No. 3 (2015): July 2015
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1694.941 KB) | DOI: 10.4308/hjb.22.3.105

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Coral diseases that have emerged since the early 1970s have caused significant regional ecological impacts. However, there has been a paucity of research into coral disease in South-East Asia, including Indonesia. This study provides baseline coral disease data in the Kepulauan Seribu Marine National Park. In this study we show a positive correlation between overall coral cover and the dominant reef building coral Montipora spp. and found two main diseases, black band disease (BBD) and WS, were highly prevalent throughout all reefs. Based on spatial location, the highest abundance of BBD (0.08 col./m2) was found at sites nearer (zone 1) to the mainland, whilst for WS (0.05 col./m2) highest abundance was found at middle sites (zone 2). According to the temporal data, the highest abundance of BBD (0.77 col./m2) was found during the transition period (between wet and dry seasons), whereas for WS higher abundance occurred within the dry season (0.07 col./m2). There was a significant difference in disease abundance among seasons which was correlated with increasing temperature and light intensity along with variations in total organic matters, nitrite and phosphate levels. Moreover, the middle sites experienced additional stress from the waste material originating from the mainland.
KAPASITAS PENANGKAPAN BERLEBIH DAN TANGKAP LEBIH PERIKANAN SKALA KECIL DI KOTA SEMARANG Malik, Jamaludin; Fahrudin, Achmad; Bengen, Dietriech Geoffrey; Khodiron, Taryono
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 11 No. 2 (2019): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.v11i2.24817

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Perikanan di Kota Semarang didominasi oleh perikanan skala kecil. Hal ini ditandai dengan penggunaan armada perikanan paling besar 10 gros ton yang beroperasi di dekat pantai. Penelitian ini mempunyai tujuan menganalisis status perikanan skala kecil di Kota Semarang untuk pengelolaan berkelanjutan. Pengelolaan berkelanjutan yang dimaksudkan yaitu pengelolaan yang menjamin tersedianya sumber daya alam dan jasa lingkungan bagi generasi yang akan datang. Penelitian dilakukan selama 3 bulan yaitu September-November 2018 di perairan pesisir Kota Semarang yang menjadi bagian dari Wilayah Pengelolaan Perikanan (WPP) 712. Metode yang dipakai dalam penelitian ini adalah analisis data runtun waktu (time series) produksi surplus yaitu data dari hasil tangkapan (ton/tahun) dan jumlah alat tangkap (unit), dalam kurun waktu 10 tahun (2007-2016), untuk menghitung nilai catch per-unit effort (CPUE), potensi maksimum lestari (MSY), jumlah effort optimum (fopt), tingkat pemanfaatan (TP) dan tingkat kapasitas (TK). Penelitian ini diperoleh hasil adanya tren penurunan CPUE; hasil tangkapan/produksi perikanan eksisting telah melewati nilai MSY-nya yaitu sebesar 479 ton/tahun (Schaefer) dan 439,11 ton/tahun (Fox); tingkat pemanfaatan lebih dari 100% yaitu sebesar 108-127% (Schaefer) dan 118-138% (Fox), sehingga perikanan skala kecil di Kota Semarang berada pada tingkat over-exploited. Berdasarkan analisis fopt menunjukkan jumlah alat tangkap yang digunakan (fexisting) telah melebihi jumlah optimumnya dengan tingkat kapasitas penangkapan melebihi 100%, sehingga perikanan skala kecil di Kota Semarang telah mengalami kelebihan kapasitas penangkapan (overcapacity).
SOCIO-ECOLOGICAL SYSTEM WITHIN GOVERNANCE OF MARINE PROTECTED AREA: CASE FROM CENDERAWASIH BAY NATIONAL PARK, INDONESIA Bawole, Roni; Yulianda, Fredinan; Bengen, Dietriech Geoffrey; Fahrudin, Achmad; Mudjirahayu, Mudjirahayu
Jurnal Manajemen Hutan Tropika Vol. 21 No. 1 (2015)
Publisher : Institut Pertanian Bogor (IPB University)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (805.287 KB) | DOI: 10.7226/jtfm.21.1.19

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Overcoming the problem of resource management which relies only on social dimension without understanding the ecosystem dynamics will not be sufficient to create sustainable management. Therefore, socio-ecological system (SES) is needed to respond changes so that robust management could be created. Research on SES was focused more on capacity of governance in creating management of conservation area, particularly in the period where there were occurrence of resistance between social problem and ecosystem. Principal component analysis explained 76% of the total variability. Very high variable respond category occurred on first principal component (PC) with positive effect which was related directly to ecological condition, and negative effect toward catch yield and utilization of traditional zone. Condition of economy and fish resources contributed positively toward second PC, and can be expressed as factor which affected economic condition of fishermen household. Condition of fishermen, related with catching activity and income of fishermen household gave positive effect toward the third PC, and can be expressed as component which affected catching effort and explained exploitation level by fishermen toward resources. Interaction between factors which formed SES occurred due to economic activity of fishermen household, catching efforts, and ecological capacity. Design of governance could be conducted on increase of fishermen household economy through control of catching efforts and considering the carrying capacity and ecological capacity.
Harmful Algal in Banyuasin Coastal Waters, South Sumatera Aryawati, Riris; Bengen, Dietriech Geoffrey; Prartono, Tri; Zulkifli, Hilda
Biosaintifika: Journal of Biology & Biology Education Vol 8, No 2 (2016): September 2016
Publisher : Department of Biology, Faculty of Mathematics and Sciences, Semarang State University . Ro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/biosaintifika.v8i2.6356

Abstract

Phytoplankton have important as food-chain major component and primary production of marine environment. However, high abundance of phytoplankton could give harmful effects toward water ecosystem. Moreover, they could produce toxic substances that will be accumulated within their consumer. This accumulation could be dangerous for human or animals.This research were aimed to determine and calculatespecies of harmful algae in Banyuasin coastal waters. The study was conducted on April, June, August, October and December of 2013, and in February 2014, at ten stations. Phytoplankton samples were taken vertically using plankton nets. In the form of cone-shaped with a diameter of 30 cm, length 100 cm and mesh size 30 ?m.The result showed that there are 35 genera of phytoplankton. That have been found and consisted of four groups; Bacillariophyceae, Dinophyceae, Cyanophyceae and Chlorophyceae. 13 species were identified as Harmful Algal (Chaetoceros, Coscinodiscus, Nitzschia, Skeletonema, Thalassiosira, Alexandrium, Ceratium, Dinophysis, Noctiluca, Protoperidinium, Prorocentrum, Anabaena dan Oscillatoria), with seven of them were known for having toxin (Nitzschia, Alexandrium, Dinophysis, Protoperidinium Prorocentrum, Anabaena and Oscillatoria). Monitoring result showed that the highest number of species of potential harmful algal blooms (HABs) occured in June and the highest abundance occured in August, especially Chaetoceros and Skeletonema.How to CiteAryawati, R., Bengen, D. G., Prartono, T., & Zulkifli, H. (2016). Harmful Algal in Banyuasin Coastal Waters, South Sumatera. Biosaintifika: Journal of Biology & Biology Education, 8(2), 231-239.
MICROBIAL COMMUNITY OF BLACK BAND DISEASE ON INFECTION, HEALTHY, AND DEAD PART OF SCLERACTINIAN Montipora sp. COLONY AT SERIBU ISLANDS, INDONESIA Johan, Ofri; Bengen, Dietriech Geoffrey; Zamani, Neviaty Putri; Suharsono, Suharsono; Smith, David; Lusiastuti, Angela Mariana; Sweet, Michael
Indonesian Aquaculture Journal Vol 9, No 2 (2014): (December 2014)
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1965.479 KB) | DOI: 10.15578/iaj.9.2.2014.165-175

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It is crucial to understand the microbial community associated with the host when attempting to discern the pathogen responsible for disease outbreaks in scleractinian corals. This study determines changes in the bacterial community associated with Montipora sp. in response to black band disease in Indonesian waters. Healthy, diseased, and dead Montipora sp. (n = 3 for each sample type per location) were collected from three different locations (Pari Island, Pramuka Island, and Peteloran Island). DGGE (Denaturing Gradient Gel Electrophoresis) was carried out to identify the bacterial community associated with each sample type and histological analysis was conducted to identify pathogens associated with specific tissues. Various Desulfovibrio species were found as novelty to be associated with infection samples, including Desulfovibrio desulfuricans, Desulfovibrio magneticus, and Desulfovibrio gigas, Bacillus benzoevorans, Bacillus farraginis in genus which previously associated with pathogenicity in corals. Various bacterial species associated with uninfected corals were lost in diseased and dead samples. Unlike healthy samples, coral tissues such as the epidermis, endodermis, zooxanthellae were not present on dead samples under histological observation. Liberated zooxanthellae and cyanobacteria were found in black band diseased Montipora sp. samples.