Rudhi Pribadi
Jurusan Ilmu kelautan, Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro, Jl. H. Prof. Sudarto, SH, Tembalang Semarang, Indonesia. 50275.
Articles
23
Documents
Komposisi Jenis dan Distribusi Gastropoda di Kawasan Hutan Mangrove Segara Anakan Cilacap

ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 14, No 2 (2009): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

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Abstract

Hutan mangrove Segara Anakan Cilacap merupakan kawasan hutan mangrove terluas di Pulau Jawa yang masih tersisa. Ekosistem di lokasi ini mempunyai produktivitas tinggi yang berperan sebagai tempat pemijahan, pembesaran, dan mencari makan bagi berbagai jenis hewan seperti ikan, krustasea, dan moluska. Gastropoda merupakan moluska yang paling banyak hidup pada hutan mangrove. Penelitian ini bertujuan untuk menganalisis komposisi, kelimpahan jenis dan distribusi gastropoda di kawasan hutan mangrove Segara Anakan Cilacap di Klaces dan Sapuregel yang masing-masing mempunyai tingkat sedimentasi yang tinggi dan rendah. Hasil penelitian menunjukkan bahwa di hutan mangrove Segara Anakan Cilacap ditemukan 29 jenis dari 10 famili gastropoda. Sedimentasi yang lebih tinggi di Klaces menyebabkan jumlah jenis dan kelimpahan individu gastropoda lebih banyak (24 jenis, 58,2 ind./m2) daripada Sapuregel (19 jenis dan 15,71 ind./m2 ) dengan Indeks KesamaanKomunitas 65,12%. Di Klaces, kemelimpahan gastropoda semakin tinggi dengan makinjauhnya lokasi dari pantai karena adanya tekanan Hngkungan yang berupa sampah organik maupun anorganik di sebagian besar pantai, namun di Sapuregel hampirsama.   Kata kunci: mangrove, gastropoda, jenis, distribusi   Mangrove forest in Segara Anakan Lagoon, Cilacap is unique natural resources and believes as the largest remained mangrove ecosystem in Java. The ecosystem shows very productive and plays important role as spawning, nursing and feeding ground of many economically important species of fishes, crustacean and mollusks. Gastropod is the most common mollusk found in mangrove area. The research aimed to analyzed composition, abundance and distribution of gastropod in Klaces having high sedimentation and sapuragel with low sedimentation in Segara Anakan Lagoon, Cilacap. The results show that at least 29 species of 10 families of gastropod found in the study area. High sedimentation at Klaces result in higher gastropods species and abundance (24 species, 58,2 ind./m2) than at Sapuregel (19 jenis dan 15,71 ind./m2) but the community similarity between the two compared areas was high (65.12%). At Klaces, the more far away from the coastline the more abundance gastropod due to environment pressure.   Key words : mangrove, gastropod, species, distribution, diversity

THE EFFECTS OF ENVIRONMENTAL FACTORS ON THE DYNAMIC GROWTH PATTERN OF MANGROVE Avicennia marina

JOURNAL OF COASTAL DEVELOPMENT Vol 16, No 1 (2012): Volume 16, Number 1, Year 2012
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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Abstract

Avicennia marina is a species of mangrove tree occurs in the intertidal zones of estuarine areas in Asia, including Indonesia. Mangrove within the genus member of Avicennia have long dominated many coastal areas along Semarang and Demak coasts. The aim of this research was to analyze the effect pattern of several environment parameters to Avicennia seedling growth rate. Observation was held by setting 8 stations with 3 transects, each including mangrove survey and environment parameter measurements. Mangrove survey including seedling and sapling stage occupying 1 x 1 m and 5 x 5 m transect plot respectively. While environmental factor measurements including on site measurement for temperature, salinity, pH and DO and laboratory analysis for organic matter, nutrient (N,P,K) and sediment structure. The results showed there were 2 effect pattern for environmental parameters observed including polynomial quadratic and logarithmic patterns. Parameters which had polynomial quadratic pattern including salinity, DO, P, sand and silt, while parameters which had logarithmic pattern were temperature, pH, organic matter and N.

Studi Perubahan Luasan Vegetasi Mangrove Mengunakan Citra Landsat Tm Dan Landsat 7 Etm+ Tahun 1998 – 2010 Di Pesisir Kabupaten Mimika Papua

Journal of Marine Research Vol 1, No 1 (2012): Journal of Marine Research
Publisher : Journal of Marine Research

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Abstract

Mangrove ecosystem is one of kind forest that naturally influenced by tides. Mangrove root’s system have capability to hold and capture sediment transported by waves or currents which bring to sedimentation or soil formation arise and become the new land for mangrove vegetation. Tailings from the mining PT. Freeport Indonesia in Tembagapura cusher form of a smooth stone is passed through Aghawagon River, followed Otomona River and deposited in the Regional Deposition Ajkwa (DPA), the possibility of 5-10% of particles remaining Sand Mining (tailings) carried out the most subtle to the Estuary Ajkwa and the Arafura Sea (PT Freeport Indonesia, 1999). Sedimentation due to the flow of the remaining mine sand from the river and taken apart Ajkwa currents, thought to affect an area of mangrove forests that exist around the estuaries in the coastal Mimika. Aim of this study is determining the extent of vegetation change in Mimika coastal mangrove District, Papua during 1998 to 2010 using multitemporal satellite imagery. The study was conducted in November 2010 to May 2011 using 1998’s Landsat TM imagery, Landsat 7 ETM + in 2002, Landsat 7 ETM + in 2006, and Landsat 7 ETM+ 2010, by using descriptive method. The results of this study indicate changes in the extent of mangrove vegetation of the estuary area to Mawati Kamora is varied, ie, in the year 1998 to 2002 has improvement 250.64 ha and 234.91 ha of reduction, in the year 2002 to 2006 has improvement 131.82 ha and 193.37 ha of reduction, in the year 20006 to 2010 experienced a reduction of 175.94 ha and 89.28 ha. Supply of sediment input in the form of tailings or suspected influence on the addition of mangrove vegetation in the Mimika District coastal area of Papua, particularly in the area and Kamora Ajkwa River Estuary, while the reduction of mangrove vegetation in the Coastal area of Timika, Papua, probably caused from to hydrological factors of the currents and waves.

Struktur dan Komposisi Vegetasi Mangrove di Kawasan Pesisir Pulau Sebatik, Kabupaten Nunukan, Kalimantan Timur

Journal of Marine Research Vol 1, No 2 (2012): Journal of Marine Research
Publisher : Journal of Marine Research

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Abstract

Sebatik Island is one of the main habitat of mangrove ecosystems in Indonesia. Based on the function, one of the mangrove forest resources with huge potential. Mangrove communities occupy the area between land and sea that have environmental conditions differ from one another. This is interesting because the management is still encountered some problems such as the conversion of mangrove forest as an area of fishpond, housing and other interests. The purpose of this study to determine the structure and composition of mangrove vegetation in Coastal Areas of Sebatik Island, Nunukan regency, East Kalimantan. The study was conducted at five locations on the island of Sebatik, the River Stake, Cape Coral, Balansiku, Setabu and Bambangan, each site is divided into 9 transects. Vegetation data retrieval done by the method of sampling survey. Each transect sampling plot made. Each individual tree (plot 10 m x 10 m) and Sapling (subplot 5 m x 5 m) were identified and measured diameter at breast height (± 1.3 m). While the calculated number of seedlings of each species and the percentage of closure (plots 1 mx 1 m). Mangrove area. The results indicate the presence of 19 species of mangrove species that fall into 14 families were found at the sites. In general, vegetation of mangrove tree is dominated by Sonneratia alba in Sebatik Island with Importance Value (IV) range from 86.83 - 171.43 % and density 500 ind/ha - 2000 ind/ha, except Bambangan which dominated by Rhizophora apiculata 86.52% and density 100 ind/ha. Sapling category, dominated by species of Sonneratia alba in Balansiku and Setabu with IV 136.65 % and 67.65 % with a density 3200 ind/ha and 1600 ind/ha. Sungai Pancang is dominated by species Avicennia alba with IV 81.64 % and density 2000 ind/ha, Tanjung Karang dominated by species Rhizopohora mucronata with IV 59.24% and density 1200 ind/ha, and Bambangan dominated by species Rhizopohora apiculata with IV 82.76% and density 2000 ind/ha. Seedling category, dominated by species of Sonneratia alba in the Sungai Pancang and Setabu with IV 107.15% and 72.79% with a density 30 000 ind/ha and 60 000 ind/ha, Tanjung Karang and Bambangan dominated by species of Rhizophora apiculata with IV 115.55 % and 136.53% and density 50 000 ind/ha and 150 000 ind/ha. species diversity and evenness was average.

Kandungan Logam Berat Pb dan Fe pada Air, Sedimen, dan Kerang Hijau (Perna viridis) Di Sungai Tapak kelurahan Tugurejo Kecamatan Tugu Kota Semarang

Journal of Marine Research Vol 1, No 1 (2012): Journal of Marine Research
Publisher : Journal of Marine Research

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Abstract

Tapak River in Semarang City District Tugu alleged to have received the negative impacts of disposal of industrial wastes, aquaculture activities, and the existence of settlements in the surrounding streams containing heavy metals and can degrade water quality. Heavy metals such as Pb and Fe into the aquatic environment will experience precipitation, dilution and dispersion, then absorbed by the organisms that live in these waters. When exposed to organisms, high concentrations of heavy metals can be toxic and tend to accumulate in vital organs. Accumulation may have an impact on the food chain that affect human health. This study aims to determine the content of heavy metals lead (Pb) and iron (Fe) in water, sediment, and mussels (breathing viridis) in the River District Tread monument city of Semarang. There are four stations are used as the sampling site. A station is located close to the highway, Station B is located close to the sewer plant, Station C is located close to residential area, and Station D is located at the mouth of the river. The results showed that the average value of the highest content of Pb in the water at station A (1.11 mg / l). The average value of the highest content of Fe in the water at Station B (1:33 mg / l). The average value of the highest content of Pb in the sediments at Station A (62.87 mg / kg). The average value of the highest content of Fe in the sediments at Station A (59232.37 mg / kg).

Konsentrasi Logam Berat Khromium (Cr) pada Air, Sedimen dan Kerang Darah (Anadara granosa) di Perairan Sungai Morosari dan Sungai Gonjol Kecamatan Sayung Kabupaten Demak

Journal of Marine Research Vol 1, No 1 (2012): Journal of Marine Research
Publisher : Journal of Marine Research

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Abstract

The waters of Morosari and Gonjol River is along the stream has been utilized for various activities such as industry, agriculture and local resident. Measurement of the concentrations of Cr in a water, sedimens, and cockles showed in the period of june 2010 as a whole is below the limit of AAS accuracy <0.01 mg/l (in the water of Morosari and Gonjol River). Cr metal Concentrations in water ranges from 0.04 to 0.29 mg/l at Morosari River and 0.09 to 0.22 mg/l at Gonjol River in July 2010. The Cr concentrations in sedimens ranges from<0.01 to 6.26 mg/kg at Morosari River and <0.01 to 9.810 mg/kg in Gonjol River. The Cr Concentrations in the cockles were below the limit of AAS accuracy <0.01mg/kg. Cr concentrations in water on June 2010 based on the Decree of Minister of Environment No. 51 Year 2004 were uncertainty, but Cr concentrations in period of July 2010 were above the limit 0,005 mg/l for marine biota and 0,002 mg/l for marine tourism. While in the sediments, referring to the quality standard set by the Ontario’s Ministry of Environment of Canada, the Cr concentrations were above the maximum limit (0.11 mg/kg) in other word, the sediments were heavily polluted. But in the soft tissue of Cockles (Anadara granosa), Cr concentrations were below the limit (<0.01 mg/kg), it means the Cockles still are unpolluted yet.

Kajian Perubahan Luas Lahan Mangrove Di Desa Bedono Kecamatan Sayung Kabupaten Demak Menggunakan Citra Satelit Ikonos Tahun 2004 Dan 2009

Journal of Marine Research Vol 1, No 2 (2012): Journal of Marine Research
Publisher : Journal of Marine Research

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Abstract

Mangroves have an important role in coastal areas that provide great functionality and benefits. Nowadays, the quality and quantity of mangrove management is declining because the management is unbalanced, such as a good land for mangrove growth were used for the development of aquaculture, settlement, and others. So, it is necessary for the proper management for the utilization of mangrove areas can be done optimally and sustainably. The management can be done through monitoring the condition of the mangrove, one of them by using remote sensing technology via satellite. The purpose of this research is to know the changes of wide in mangrove land in the coastal area in Bedono village, District Sayung, Demak district from 2004 to 2009. The method which is used in this research is descriptive method. It is fact-finding method with appropriate interpretation. For the field survey uses squared sampling method, it makes the plot measuring 10 m x 10 m for the tree category in which there are 5 m x 5 m subplot for sapling category and 1 m x 1 m for seedling category. The results show that the land accretion mangrove area in the Bedono Village of years 2004 - 2009, from 22.41 ha in 2004 to 43.03 ha in 2009. Density of the dense mangroves suffered extensive increment of 5.06 ha in 2004 to 27.06 ha in 2009, the density of the moderate mangrove area is suffered extensive accretion of 2.41 ha in 2004 to 8.89 ha in 2009, while the density of rare mangrove area has decreased from 14.94 ha in 2004 to 7.08 ha in 2009. The Composition of mangrove vegetation is found in the coastal in the Bedono Village, Sayung District consists of three species, namely Avicennia Marina, Rhizophora Mucronata and Rhizophora Stylosa. The mangrove dominance of tree category is occupied by Avicennia Marina, while the category of sapling and seedling mangroves is dominated by Rhizophora Mucronata.

ANALISIS PERUBAHAN LUAS MANGROVE BERDASARKAN CITRA SATELIT IKONOS TAHUN 2004 DAN 2010 DI KECAMATAN MLONGGO, TAHUNAN DAN KEDUNG KABUPATEN JEPARA JAWA TENGAH

Journal of Marine Research Vol 2, No 3 (2013) : Journal of Marine Research
Publisher : Journal of Marine Research

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Abstract

Mangrove as one of coastal ecosystem has plenty of role on coastal stability, but the current condition even though of mangroves ecosystem is Java, including Jepara destructed by many reasons mostly human activities such as. Conversion of mangrove forests to ponds, settlements and illegal logging. Rehabilitation was conducted in some places. therefore, there is a need of review the changes. The purpose of this study to determine the mangrove area changes based on IKONOS satellite imagery of 2004 and 2010 in the District Mlonggo, Tahunan and Kedung, Jepara. Descriptive method is used to describe the state of research areas by comparing the field data and interpretation process. Satellite images have been digitized in overlay to know the changes at mangrove area. Ground check was conducted the field using the quadratic sampling plots of 10m x 10m to for tree, 5m x 5m for sapling and 1m x 1m for seedling. The results were increate that the between period of 2004 to 2010. However, the mangrove area increased 5,959 ha and reduced 5,294 ha and so there was in general 0.665 ha increased. The total area at mangrove in 2004 38,098 ha and in 2010 was variously 37,444. There were at least 20 species in the research area and Rhizophora sp was the most dominant species.

STRUKTUR KOMUNITAS MANGROVE DI PULAU JEMAJA, KABUPATEN KEPULAUAN ANAMBAS, DAN PULAU LIRAN, KABUPATEN MALUKU BARAT DAYA

Journal of Marine Research Vol 2, No 2 (2013) : Journal of Marine Research
Publisher : Journal of Marine Research

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Abstract

Mangrove Vegetation occupy the area between land and sea that have environmental conditions differ from one another. The purpose of this study is to know about the structure and composition of mangrove vegetation in Jemaja Island, Kepulauan Anambas Regency, Riau Islands Province, and Liran Island, South-East Moluccas Regency, Moluccas Province. Vegetation data taking based on purposive sampling method and every transect made sampling plot. Each tree (plot 10 m x 10 m) and sapling (subplot 5 m x 5 m) identified and measured on diameter at breast height (± 1.3 m). Seedling calculated the amount of each species and the percentage of cover on subplot 1 m x 1 m. The result of research in Jemaja Island was found 17 mangrove species. Tree mangrove in Jemaja Island have the range of density 375 ind/ha – 950 ind/ha were dominated by Rhizophora apiculata (Importance Index 89,73% - 123,42%). The result of research in Liran Island was found 19 mangrove species. Tree mangrove in Liran Island have the range of density 500 ind/ha – 566 ind/ha were dominated by Sonneratia alba with range of Importance Index 135,90% - 160,32%. The Index of Diversity (H’) and Eveness (J’) of mangrove vegetation in Jemaja Island, District of Anambas Islands and Liran Island, District of South-East Moluccas, were in low category.

Studi Kandungan Bahan Organik Dan Mineral (N, P, K, Fe dan Mg) Sedimen Di Kawasan Mangrove Desa Bedono, Kecamatan Sayung, Kabupaten Demak

Journal of Marine Research Vol 2, No 1 (2013): Journal of Marine Research
Publisher : Journal of Marine Research

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Abstract

Mangroves in Bedono Village, District Sayung, Demak Regency considered as degraded mainly due to land conversion and reclamation which lead to coastal erosion and permanent flooding. This mangroves condition, in conjuction with the exsistance of several estuaries believes in some part controlled sedimentation and related process in the area including sediment particle size, organic and mineral (N, P, K,Fe and Mg) distribution. The study was aimed to determine distribution of organic and mineral (N, P, K,Fe and Mg) of mangrove sediment in Bedono Village, District Sayung, Demak Regency, and conducted between May-July 2010. A purposive sampling base descriptive method was applied for this study, and sediment samples were analysed at Geological Laboratory (Marine Science Department) Faculty of Fisheries and Marine Sciences and Chemical Analytical Laboratory (Chemical Department), Faculty of Science and Mathematics, Diponegoro University. The result showed that sediment organic content of Tunjung Sari (15,42%) and Gonjol (16,46%) were slightly higer than in Sayung (12,48%) and Soban (12,06%), N content in Tunjung Sari (0,46%) and Soban (0,43%) much higher than in Gonjol (0,27%) and Sayung (0,29%), while P content in Gonjol (354,73 mg/kg) was the highest followed by Tunjung Sari (245,60 mg/kg) and Sayung (203,43 mg/kg) and the lowest was in Soban (80,42 mg/kg). The rate of sediment K content, similar to N content, was high in Tunjung Sari (0,50%) and Soban (0,54%) and lower in Gonjol (0,39%) and Sayung (0,35%). Fe content was higher in Gonjol (5,52 %) than in Tunjung Sari (3,93 %), Sayung (2,55 %) and Soban (3,92 %), meanwhile Mg content was higher in Tunjung Sari (0,125 %) than Gonjol (0,075 %), Sayung (0,080 %) and Soban (0,006 %).