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Mangrove ecosystem resilience to sea level rise: a case study of Blanakan Bay, Subang Regency, West Java, Indonesia Yulianti, Poppy; Wardiatno, Yusli; Samosir, Agustinus M
AQUATIC SCIENCE & MANAGEMENT Vol 1, No 1 (2013): April
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jasm.1.1.2013.1971

Abstract

This research was conducted to assess the social and ecological resiliences of mangrove ecosystem to sea level rise as a consequence of climate change. Resilience Index (RI) method was used range from 0 to 1. Sixteen resilience indicators, both ecological and social, are selected, developed, and evaluated. The indicators consist of mangrove coverage, density and diversity, aquatic fauna species, tidal flooding, salinity, sedimentation, land use, mangrove dependency and time allocation, conflicts potential, knowledge, the compliance rate, types of livelihood, institution cap, and level of education. Evaluation result indicate that the bay was divided into two categories of resilience; the majority has middle resilience because the mangrove coverage, density, and land use are high, with composite RI (CRI) range from 0.45 to 0.58. This was found in the villages of Muara, Langensari, Blanakan, Jayamukti, and Rawameneng. Only one village has high CRI of 0.69, such as the Cilamaya Girang. The main ecological factors that contribute to the high resilience of the area is the rate of sedimentation of 2 meters per year and rare tidal flooding, while the factor that contributes most to the impediment of social resilience is public knowledge about the importance of mangrove ecosystems©Penelitian ini merupakan penilaian parameter resiliensi ekologis-sosial ekosistem mangrove terhadap penaikan muka air laut sebagai konsekuensi dari perubahan iklim. Analisis yang dilakukan adalah untuk menghitung indeks resiliensi (Resiliency Index/RI) yang menggunakan skala 0-1. Enam belas parameter (ekologis-sosial) digunakan dalam penelitian ini, yaitu: penutupan, kerapatan, keanekaragaman jenis mangrove, jenis fauna akuatik, salinitas, banjir pasang, penggunaan lahan, laju sedimentasi, ketergantungan masyarakat, alokasi waktu pemanfaatan ekosistem mangrove, potensi konflik, tingkat kepatuhan masyarakat, pemahaman fungsi mangrove, jenis mata pencaharian, kelembagaan, dan tingkat pendidikan. Hasil analisis RI menunjukkan, Teluk Blanakan hanya memiliki 2 tingkat resiliensi, yaitu Tingkat Menengah dan Tingkat Tinggi. Tingkat Menengah memiliki penutupan mangrove yang rendah, kerapatan mangrove yang rendah, dan ketergantungan pemanfaatan mangrove yang sangat tinggi dengan kisaran nilai RI 0.45-0.58 yang ditempati oleh Desa Rawameneng, Jayamukti, Blanakan, Langensari, dan Muara. Tingkat Tinggi dengan nilai RI 0.69 hanya ditempati oleh Desa Cilamaya Girang, karena memiliki laju sedimentasi dan ketergantungan masyarakat terhadap kawasan mangrove yang rendah©
Kondisi Terumbu Karang di Perairan Pulau Tegal dan Sidodadi Kecamatan Padang Cermin Kabupaten Pesawaran Provinsi Lampung ., Hartoni; Damar, Ario; Wardiatno, Yusli
Maspari Journal : Marine Science Research Vol 4, No 1 (2012): Edisi Januari
Publisher : UNIVERSITAS SRIWIJAYA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (372.671 KB) | DOI: 10.36706/maspari.v4i1.1341

Abstract

Coral reefs are ecosystem that have important economic value, but very fragile towards natural factor and human activities. Increasing human activities around the coastal waters will affect the ecosystem of coral reefs. The research was conducted from April to July 2010. The purpose of this study were to analyze the current state of coral reefs, to analyze the extent of damage and identify the cause of damage in Tegal island and Sidodadi waters. Percentage of life coral cover was obtained using line intercept transect (LIT) method. The results showed that percentage of life coral cover at 6 observation stations approximately 37.76% - 65.90%. The highest percentage live coral cover at Station 2 and the lowest at Station 3. In general, the condition of coral reef life was categorized "medium" with an average percentage of 49.87%. Damage of coral reefs were caused by bombing activities to catch fish, coral mining for construction materials and jewelry, anchor of ships, marine tourism activities and culture.   Keyword: Coral reefs, Tegal island, Sidodadi.   ABSTRAK Terumbu karang adalah ekosistem yang mempunyai nilai ekonomi penting, tapi sangat rapuh terhadap faktor alam dan aktivitas manusia. Meningkatnya aktivitas manusia di sekitar perairan pesisir berdampak terhadap ekosistem terumbu karang. Penelitian ini dilaksanakan dari bulan April sampai Juli 2010. Tujuan penelitian ini adalah menganalisis kondisi terkini tutupan terumbu karang di perairan Pulau Tegal dan  Sidodadi. Penelitian ini dilakukan dari bulan April sampai bulan Juli 2010 di perairan Pulau Tegal dan Sidodadi Kecamatan Padang Cermin  Kabupaten Pesawaran Provinsi Lampung. Pengambilan data tutupan karang menggunakan metode line intercept transect (LIT). Hasil penelitian menunjukkan bahwa tutupan karang hidup di 6 Stasiun pengamatan berkisar antara 37,76% - 65,90%. Tutupan terumbu karang terendah di Stasiun 3 sedangkan tutupan tertinggi di Stasiun 2. Secara umum kondisi terumbu karang di perairan Pulau Tegal dan Sidodadi dikategorikan kondisi sedang dengan rata-rata tutupan karang sebesar 49,87%. Kerusakan terumbu karang disebabkan oleh aktivitas pengeboman, penambangan karang untuk bahan bangunan dan souvenir, jangkar kapal, wisata bahari dan budidaya laut.   Kata Kunci: Terumbu karang, Pulau Tegal, Sidodadi
Feeding behaviour and bioerosion: the ecological role of the rock-boring urchin, Echinometra mathaei (de Blainville, 1825), in Okinawa reef flat Satyawan, Noar Muda; Tutupoho, Shelly; Wardiatno, Yusli; Tsuchiya, Makoto
AQUATIC SCIENCE & MANAGEMENT Vol 1, No 1 (2013): April
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jasm.1.1.2013.1976

Abstract

Erosion rate on corals due to activities of other biota is called bioerosion. The rock-boring urchin, Echinometra mathaei, when it is abundant, plays a significant role in benthic ecosystems, including biological processes like coral erosion. During feeding, E. mathaei erodes calcium carbonate besides grazing on algae living on coral, so it plays an important role in both organic and inorganic carbons in coral reefs. The urchin E. mathaei actively feeds during the night time (nocturnal grazer). Although in Okinawa four types (A-D) of the urchin exist, the research only focused on the types A and B. Type A of E. mathaei produced 0.44951 g feces per day on average while type B produced 0.38030 g feces per day. CaCO3 analysis in feces and gut contents showed bioerosion rate of E. mathaei type A was 0.64492 g/individu/day, and 0.54436 g/individu/day in type B. There were no significant differences in bioerosion impact of E. mathaei type A and B© Laju erosi pada karang yang disebabkan oleh biota, dikenal dengan bioerosi. Bulu babi jenis Echinometra mathaei, ketika melimpah, menjadi sangat berpengaruh terhadap ekosistem bentik termasuk proses biologi seperti erosi karang. Selama aktivitas makan, E. mathaei menggerus kalsium karbonat dalam proporsi yang besar di samping alga yang tumbuh menempel pada karang sehingga memiliki peran penting dalam siklus karbon organik dan anorganik di ekosistem terumbu karang. Bulu babi E. mathaei aktif mencari makan pada malam hari (nocturnal grazer). Meskipun di Okinanawa ada 4 tipe (A-D), pada eksperimen kali ini memfokuskan pada tipe A dan B saja. Tipe A E. mathaei rata-rata memproduksi 0,44951 g feses/hari dan tipe B memproduksi 0,38030 g feses/hari. Berdasarkan analisis CaCO3 yang dilakukan pada feses dan isi lambung, laju bioerosi yang disebabkan oleh E. mathaei tipe A sebesar 0,64492 g/individu/hari sedangkan tipe B sebesar 0,54436 g/individu/hari. Tidak terdapat perbedaan dampak bioerosi yang signifikan antara E. mathaei tipe A dan B©
PENGARUH AKTIVITAS ANTROPOGENIK DI SUNGAI CILIWUNG TERHADAP KOMUNITAS LARVA TRICHOPTERA Sudarso, Jojok; Wardiatno, Yusli; Setiyanto, Daniel Djoko; Anggraitoningsih, Woro
Jurnal Manusia dan Lingkungan (Journal of People and Environment) Vol 20, No 1 (2013)
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1.84 KB)

Abstract

Sungai Ciliwung merupakan salah satu sungai besar di Propinsi Jawa Barat yang sekarang telah mengalami pencemaran organik dan kontaminasi oleh logam merkuri. Adanya pencemaran di Sungai Ciliwung dikhawatirkan dapat mengganggu keseimbangan ekologi dari larva serangga Trichoptera. Oleh sebab itu tujuan dari penelitian ini adalah mengungkap pengaruh aktivitas antropogenik pada Sungai Ciliwung terhadap komunitas larva Trichoptera. Pengambilan larva dilakukan dengan menggunakan jala surber dengan limakali ulangan setiap lokasi. Analisis korelasi pearson-product moment menunjukkan adanya korelasi yang kuat (r > 0,5) antara metrik biologi jumlah taksa, jumlah skor Stream Invertebrate Grade Number-Average level SIGNAL, % kelimpahan dominansi 3, dan indeks SIGNAL dengan variabel lingkungan: suhu air, coarse particulate organic matter (CPOM), kandungan oksigen terlarut (DO), konduktivitas, total padatan tersuspensi (TDS), C dan N dalam partikulat, nitrat, amonium, ortofosfat, COD, logam merkuri di air dan sedimen, indeks habitat, distribusi partikel, turbiditas, indeks kimia Kirchoff, dan indeks pencemaran logam merkuri di sedimen. Larva Trichoptera Helicopsyche, Apsilochorema, Caenota, Ulmerochorema, Chimarra, Antipodoecia, Diplectrona, Anisocentropus, Lepidostoma, Genus Hel.C cenderung dicirikan oleh tingkat pencemaran organik yang rendah, tingginya komposisi % kerikil dan CPOM, dan kondisi habitat yang minim mengalami gangguan. Sebaliknya Glososomatidae genus 1, Cheumatopsyche, Setodes, dan Tinodes cenderung lebih toleran terhadap polutan organik, rendahnya CPOM, tingginya variabel turbiditas, konsentrasi merkuri di sedimen, TDS, dan % clay.  
Pertumbuhan Siput Lola (Trochus niloticus L. 1767) di Perairan Kepulauan Banda Naira Kabupaten Maluku Tengah Abukena, Safrudin La; Wardiatno, Yusli; Setyobudiandi, Isdradjat; Khouw, Abraham S
JURNAL BIOLOGI INDONESIA Vol 10, No 2 (2014): Jurnal Biologi Indonesia
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (311.994 KB) | DOI: 10.14203/jbi.v10i2.3032

Abstract

Maluku as a major producer, reached the highest production of siput lola (T. niloticus) in 1989 with production about 250tons (6.8 billion) but then drastically decreased to 14.2 tons in 2005. This study was conducted over 16 months (March2012 - June 2013) in the waters of the Banda Islands. The purpose of the study was to determine the individual andpopulation growth of trochus snails. Individual growth rate (K) of siput lola resource for deameter basalt (DB) was equal to0.2439 (von Bertalanffy models) and 0.3571 (Gompertz models). Maximum size (S?) that could be achieved for deameterbasalt was equal to 91.73 mm (von Bertalanffy models) and 88.52 mm (Gompertz models). The population growth rate(r) of siput lola resource was at 0.1469 with a maximum amount that could be reached as many as 401 ind or 122ind ha-1 (von Bertalanffy models) and 191 ind or 58 ind ha-1 (Gompertz models) within a period of 24 months.Keywords : Growth, Trochus niloticus, Banda Naira islands
Fluks Bentik dan Potensi Aktivitas Bakteri Terkait Siklus Nitrogen di Sedimen Perairan Mangrove Pulau Dua, Banten Iswantari, Aliati; Wardiatno, Yusli; Pratiwi, Niken T.M; Rusmana, Iman
JURNAL BIOLOGI INDONESIA Vol 10, No 1 (2014): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (265.728 KB) | DOI: 10.14203/jbi.v10i1.336

Abstract

Mangrove ecosystem has important role as source of nutrient particularly nitrogen in coastal area. Nitrogen (N) is alimiting factor in marine and coastal area. The aim of this research was to study benthic fluxes and potency ofbacterial activity in sediment of mangroves area, related to nitrogen cycle. This research was conducted in floodedmangroves area in Pulau Dua. The sediment and overlying water was sampled using sediment core sampler.Experimental treatment for flux analysis and sediment-slurry were conducted in three hours. Nutrient of NH3-N,NO2-N, and NO3-N and abundance of nitrifier, denitrifier, DNRA, and ammonifier were analyzed. The resultsshowed that the abundance of anaerobic bacteria was higher than aerobic bacteria. The dominance of bacterialgroups found in sediment was ammonification bacteria. The highest nutrient concentration in sediment was NH3-N. Benthic fluxes value showed higher NH3-N tends to release from the sediment to water than NO2-N and NO3-N. Generally, mangrove sediment in Pulau Dua has higher potency ofbacterial activity (Vmax and Km) in NO3reduction by anaerobic bacteria than NH3 oxidation by aerobic bacteria.Keywords: bacteria, benthic fluxes, mangrove, potency of bacterial activity, sediment
KETERKAITAN STRUKTUR KOMUNITAS MEIOFAUNA DENGAN KERAPATAN LAMUN DAN PARAMETER LINGKUNGAN DI SELAT DOMPAK, KEPULAUAN RIAU Zulkifli, Zulkifli; Soedharma, Dedi; Wardiatno, Yusli; Sanusi, Harpasis S.
Jurnal Perikanan dan Kelautan Vol 12, No 01 (2007)
Publisher : Fakultas Perikanan dan Kelautan Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jpk.12.01.15-22

Abstract

A study on the relationship between meiofauna community structure with seagrassdensity and environmental parameters has been carried out in the Dompak Straitwaters, Riau Archipelago. This study were investigated on four different seasonsthroughout a year, from May 2005 to April 2006. Three sampling site, i.e.., Al, A2and A3 were chosen to represent research sites. The sediment samples were tekenby PVC cores, in which six layers were separated (i.e. 0-5 cm, 5-10 cm, 10-15 cm,15-20 cm, 20-25 cm and 25-30 cm). The environmental parameters, such ascurrent velocity, the sediment composition, total organic carbon (TOO, totalorganic matter (TOM), pH and redox potential (Eh), were also observed. The dataon meiofauna, seagrass density and environmental parameters were analyzedstatistically by a regression analyisis. This analysis was run using a SPSS softwareversion 11.5 for Windows. The meiofauna was dominated by Nematodes,Copepods, Polychaetes, Foraniiniferans and Turbellarians. The results areshowing that the meiofaunal community structure would depend on severalconditions such as seagrass density, environmental factors and hydrologicalcharacteristics. The regression results are showing that the meiofaunal communitystructure patterns was significantly correlated with seagrass density and to theenvironmental parameters. Vertically, the meiofaunal community structurepatterns seems to be more affected by TOC and TOM. While the horizontally, itseems to he more affected by current velocity, TOM and pH.
Kandungan Fenol dan Aktivitas Antioksidan Makroalga Bentik Caulerpa racemosa (Forsskal) dari Teluk Hurun, Lampung Santoso, Joko; Fitriani, Diini; Wardiatno, Yusli
Biota : Jurnal Ilmiah Ilmu-Ilmu Hayati Vol 15, No 3 (2010): October 2010
Publisher : Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (298.442 KB) | DOI: 10.24002/biota.v15i3.2592

Abstract

Caulerpa racemosa is a green benthic macroalga that mainly grows in tropical regions which is expected to bask of strong ultraviolet radiation from sunlight. This circumstance can cause to increase levels of reactive radical species. To reduce and/or protect, organism like macroalga may change its metabolism and stimulate to produce some active compounds, therefore, tropical macroalgae are estimated possessing a large number of active compounds such as antioxidant. In this experiment, edible green benthic macroalga Caulerpa racemosa grown in different water condition were used. The content of total phenol and antioxidant activity of ethyl acetate extract were performed. Pearson correlation between waters condition and antioxidant activities i.e. total phenol and DPPH inhibition were also analyzed. Caulerpa racemosa grown in station 2, exposed in strong radiation from sunlight, had the highest content of total phenol and percentage of DPPH inhibition, with their values were 12.60% and 46.43% respectively. Sunlight intencity in waters had strong positive correlation to the total phenol content and reducing activity of DPPH, however, parameters of nitrate and ammonia had strong negative correlation.
PERTUMBUHAN SIPUT LOLA (TROCHUS NILOTICUS L. 1767) DI PERAIRAN KEPULAUAN BANDA NAIRA KABUPATEN MALUKU TENGAH Abukena, Safrudin La; Wardiatno, Yusli; Setyobudiandi, Isdradjat; Khouw, Abraham S
JURNAL BIOLOGI INDONESIA Vol 10, No 2 (2014): Jurnal Biologi Indonesia
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jbi.v10i2.3032

Abstract

Maluku as a major producer, reached the highest production of siput lola (T. niloticus) in 1989 with production about 250tons (6.8 billion) but then drastically decreased to 14.2 tons in 2005. This study was conducted over 16 months (March2012 - June 2013) in the waters of the Banda Islands. The purpose of the study was to determine the individual andpopulation growth of trochus snails. Individual growth rate (K) of siput lola resource for deameter basalt (DB) was equal to0.2439 (von Bertalanffy models) and 0.3571 (Gompertz models). Maximum size (S?) that could be achieved for deameterbasalt was equal to 91.73 mm (von Bertalanffy models) and 88.52 mm (Gompertz models). The population growth rate(r) of siput lola resource was at 0.1469 with a maximum amount that could be reached as many as 401 ind or 122ind ha-1 (von Bertalanffy models) and 191 ind or 58 ind ha-1 (Gompertz models) within a period of 24 months.Keywords : Growth, Trochus niloticus, Banda Naira islands
FLUKS BENTIK DAN POTENSI AKTIVITAS BAKTERI TERKAIT SIKLUS NITROGEN DI SEDIMEN PERAIRAN MANGROVE PULAU DUA, BANTEN Iswantari, Aliati; Wardiatno, Yusli; Pratiwi, Niken T.M; Rusmana, Iman
JURNAL BIOLOGI INDONESIA Vol 10, No 1 (2014): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jbi.v10i1.336

Abstract

Mangrove ecosystem has important role as source of nutrient particularly nitrogen in coastal area. Nitrogen (N) is alimiting factor in marine and coastal area. The aim of this research was to study benthic fluxes and potency ofbacterial activity in sediment of mangroves area, related to nitrogen cycle. This research was conducted in floodedmangroves area in Pulau Dua. The sediment and overlying water was sampled using sediment core sampler.Experimental treatment for flux analysis and sediment-slurry were conducted in three hours. Nutrient of NH3-N,NO2-N, and NO3-N and abundance of nitrifier, denitrifier, DNRA, and ammonifier were analyzed. The resultsshowed that the abundance of anaerobic bacteria was higher than aerobic bacteria. The dominance of bacterialgroups found in sediment was ammonification bacteria. The highest nutrient concentration in sediment was NH3-N. Benthic fluxes value showed higher NH3-N tends to release from the sediment to water than NO2-N and NO3-N. Generally, mangrove sediment in Pulau Dua has higher potency ofbacterial activity (Vmax and Km) in NO3reduction by anaerobic bacteria than NH3 oxidation by aerobic bacteria.Keywords: bacteria, benthic fluxes, mangrove, potency of bacterial activity, sediment