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ILMU KELAUTAN: Indonesian Journal of Marine Sciences

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Published by Universitas Diponegoro

ISSN : 08537291 EISSN : 24067598 DOI : -

Core Subject : Science,

Earth & Planetary Sciences

ILMU KELAUTAN: Indonesian Journal of Marine Sciences (IJMS) is dedicated to published highest quality of research papers and review on all aspects of marine biology, marine conservation, marine culture, marine geology and oceanography.

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Articles 743 Documents

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Levels and Health Risk Assessments of Cd and Pb in Pomadasys maculatus Marketed by Karachi Fish Harbor, Pakistan Quratulan Ahmed; Levent Bat
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 21, No 2 (2016): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Aim of this study was to measure cadmium and lead concentrations in the edible tissues of Saddle grunt Pomadasys maculatus (Bloch, 1793) from Karachi Fish Harbor different seasons of the year 2011. Results showed that the concentration varied from 0.18 to 1.14 with a mean of 0.59 ± 0.05 mg.kg-1 for Cd and from 0.02 to 1.54 with a mean of 0.54 ± 0.05 mg.kg-1 for Pb. These concentrations are higher than the maximum permissible values in European and other international regulations (Global Agricultural Information Network Report for China, Russian Federation , Australia New Zealand Food Standards, Georgian Food Safety Rules, Turkish Food Codex and the Ministry of Agriculture, Fisheries and Food). However the average weekly intakes of Cd and Pb per body weight values (minimum-maximum) were 0.021 (0.0063-0.0399) and 0.019 (0.0007-0.0539)mg.week-1.70 kg body weight-1, respectively and not exceeded the Provisional Tolerable Weekly Intake (PTWI) established. Consumption of Saddle grunt from the Karachi coasts of Pakistan can therefore be said to constitute no health risks so far as the heavy metals investigated are concerned. However, due to the Cd and Pb muscle levels exceeded the maximum levels of fish permitted for human consumption, a plausible health risk could be posed by long-term exposed through Saddle grunt consumption. Keywords: Lead, Cadmium, Pomadasys maculatus, Karachi coast, Pakistan

Pola Arus dan Kelimpahan Karang Pocillopora damicornis di Pulau Panjang, Jawa Tengah Munasik Munasik; Denny N Sugianto; Widodo S Pranowo; Suharsono Suharsono; Jesmant Situmorang; Kamiso HN
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 11, No 1 (2006): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Studi pola arus dan kelimpahan karang Pocillopora damicornis telah dilakukan di Pulau Panjang, Jawa Tengah (6° 34’ 30" LS 110° 37’ 45" BT). Pengukuran arus ini dilakukan di sisi selatan dan utara Pulau Panjang setiap jam pada tanggal 21-24 Oktober 2004 sewaktu musim planulasi karang. Kelimpahan karang diukur dengan metode transek kuadrat 4x4 m, sedangkan kelimpahan planula-larva diketahui melalui penarikan jaring plankton (zoo) di dua sisi pulau. Studi penempelan anakan karang dilakukan dengan memasang spat kolektor dari lempengan batu alam 15x15 cm di dua sisi pulau selama 2 bulan. Pola arus di Pulau Panjang menunjukkan kesamaan dengan pola pasang surut dan terdapat perbedaan pola arus antara sisi utara dan selatan pulau. Pola pergerakan arus di perairan Pulau Panjang merupakan subsistem arus utama di semenanjung Muria, dimana di sisi selatan arus bergerak ke arah Timurlaut dan ketika mendekati perairan pantai Pulau Panjang akan terpecah alirannya, yaitu ada yang mengarah ke selatan (berbelok ke Timur atau ke Tenggara), dan satu lagi mengarah utara (sebagian ada yang lurus ke arah Timurlaut, dan sebagian berbelok ke Utara atau Barat atau ke Timur). Pola arus pada musim planulasi karang P. damicornis2 dan 26,59 ± 2,47 individu/100 m3 di sisi selatan sedangkan di sisi utara pulau sebesar 0,15 koloni/m2 dan 11,31± 0,47 individu/100 m3. Tingginya kelimpahan karang dan larva karang di sisi selatan pulau diduga akibat pola arus di telah mempertahankan larva di perairan yang ditandai oleh keberhasilan rekruitmen di sisi selatan sehingga wilayah ini berperan sebagai larval trap kemungkinan telah mempengaruhi kelimpahan karang di P. Panjang. Kelimpahan karang dan larva karang rata-rata masing-masing sebesar 0,56 koloni/m Kata kunci: pola arus, planulasi, kelimpahan karang, Pocillopora damicornis, P. Panjang, Jawa TengahCurrent pattern and abundant of scleractinian coral Pocillopora damicornis were studied in Panjang Island, Central Java (6° 34’ 30" S 110° 37’ 45" E). Current measurements, quadrates transect (4x4m) surveys, plankton tows and corals recruitment were conducted in both southern and northern sites of Panjang Island. Between 21 and 24 October 2004 (during planulation period), the time series of current were measured at the both site of Panjang Island. The current data were plotted in velocity and vector. The current pattern in Panjang Island is compatible with tidal current. Maximum velocity of current occurs during outgoing tide in the southern site, however during low tides current velocity is minimal. Inversely, in the northern site, maximum velocity occurs during incoming tide but minimum velocity occurs in outgoing tide. Tidal current which may run over the study reefs during outgoing tide by changing direction to eastern and south-eastern in the leeward (southern site). The circulation might have trapped larvae in the leeward reefs (southern) long enough to account for higher numbers recruits in southern. That was indicated that both planula-larva and adult of P. damicornisin southern site was denser than that in the northern site. The density of planula-larva and adult of coral were 26.59 ± 2.47 individu/100 m3 and 0.56 colony/m2 in the southern while in the northern site were 11.31± 0.47 individu/100 m3 and 0.15 colony/m2respectively. We inferred that tidal current may influence the dispersal of coral larvae in Panjang Island. Key words: current pattern, planula-larva, coral abundant, Pocillopora damicornis, P. Panjang, Central Java

Suhu dan Salinitas Permukaan Merupakan Indikator Upwelling Sebagai Respon Terhadap Angin Muson Tenggara di Perairan Bagian Utara Laut Sawu (Surface Temperature and Salinity are Indicators of Upwelling In Response to Southeast Moonson in the Savu Sea) Simon Tubalawony; Edi Kusmanto; Muhadjirin Muhadjirin
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 17, No 4 (2012): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Laut Sawu merupakan bagian perairan Indonesia yang secara langsung berbatasan dengan Samudera Hindia. Di bagian utara, terutama perairan selatan Selat Flores, Selat Lamakera dan Selat Alor merupakan perairan dinamik dengan perubahan suhu dan salinitas permukaan yang signifikan pada musim angin muson tenggara. Dinamika perairan tersebut terutama di lapisan permukaan sangat dipengaruhi pola tiupan angin muson. Pada bulan Juni-Juli angin muson tenggara bertiup dengan kekuatan maksimum di sebagian wilayah Indonesia termasuk di bagian utara Laut Sawu. Tiupan angin tersebut menyebabkan pergerakan massa air permukaan cenderung bergerak ke arah barat. Keadaan tersebut menyebabkan terjadinya pengangkatan massa air lapisan dalam ke permukaan di bagian utara Laut Sawu. Suhu permukaan laut di laut Flores berkisar antara 27,45-27,79 oC dengan rerata 27,62±0,14 oC, sedangkan pada stasiun pengamatan di bagian selatan dan berhubungan langsung dengan Laut Sawu, suhu perairan berkisar 25,25-26,75 oC dengan rerata 25,90±0,43oC. Secara umum sebaran suhu pada lapisan permukaan laut pada kedalaman 0-5 m menunjukkan semakin ke selatan massa air permukaan laut semakin dingin. Pusat konsentrasi massa air dengan suhu terendah di selatan Selat Alor berkisar antara 25,25-25,89oC. Dinginnya massa air perairan bagian utara Laut Sawu mengindikasikan kemungkinan terjadi pengangkatan massa air dalam ke permukaan pada perairan tersebut.Kata kunci: Laut Sawu, upwelling, salinitas, suhu permukaan laut, termoklinSavu Sea waters are part of Indonesia waters which is located directly adjacent to Indian Ocean. The northern part of Savu Sea particularly in the south of Flores Strait, Lamakera Strait and the Strait of Alor waters are dynamic with changes in temperature and salinity of the surface which is significant at southeast monsoon season. The dynamics of these waters, especially in the surface layer is strongly influenced by the monsoon wind patterns. In June-July, the monsoon winds blowing from southeast with maximum strength in parts of Indonesia, including in the waters of the northern Sea Savu. The wind causes the movement of surface water masses tend to move westward. These circumstances would to bring deeper and colder waters to the surface layer in the northern part of Savu Sea. Sea surface temperature in the Flores Sea ranged from 27.45 to 27.79°C with a mean 27.62 ± 0.14°C, whereas the observation stations located in the south and deal directly with the Savu Sea, water temperatures in the range 25.25 to 26.75°C with a mean 25.90 ± 0.43°C. In general, the temperature distribution on the surface layer of the ocean at a depth of 0-5 m to the south indicates that the mass of sea water gets colder. Central mass concentration of water with the lowest temperature in the southern Strait of Alor range from 25.25 to 25.89°C. The cold waters of the northern part of the Savu Sea water mass indicates the possibility upwelling of water mass in the Savu waters.Key words: Savu sea, upwelling, salinity, sea surface temperature, thermocline

SST Cooling in the Indonesian Seas Riza Yuliratno Setiawan; Abdullah Habibi
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 15, No 1 (2010): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Using advance satellite-derived sea surface temperature (SST) and sea surface wind, the characteristics of SST and wind variations in the internal Indonesian Seas (hereafter INA) were investigated. The seasonal cycle of SST in the INA is marked by a cooling in the dry season. The cooling, which occurs during May–August, is maximum in the eastern INA and decreases towards west. This study indicated that the southeasterly monsoon winds play a signicant role in the cooling phenomena in Indonesian Seas. The cooling is first identified in May, while August is its mature phase and it is affected by stronger winds (7-8 m/s) during July. An area with SST lower than 26°C appears in the Banda Sea, representing the coolest region in the INA. The results of the present investigation inferred that SST cooling in the INA is caused by southeast monsoon winds-ocean interaction. Key words: satellite remote sensing, SST cooling, southeast monsoon winds. Menggunakan satelit pemantau suhu permukaan laut (SPL) dan angin permukaan laut telah dikaji karakteristik dari SPL dan angin permukaan laut di perairan Indonesia. Siklus musiman SPL di perairan Indonesia dicirikan dengan “pendinginan” selama musim panas. Pendinginan, yang terjadi dari bulan Mei sampai Agustus, maksimum di perairan Indonesia timur dan minimum di perairan Indonesia barat. Studi ini mengindikasikan bahwa angin monsoon dari arah tenggara berperan penting dalam fenomena pendinginan di perairan Indonesia. Pendinginan pertama kali muncul di bulan Mei dan mencapai maksimum di bulan Agustus. Pendinginan tersebut disebabkan oleh pengaruh angin monsoon yang sangat kuat di bulan Juli. Area dengan SPL di bawah 26°C tampak di Laut Banda, dimana merupakan perairan yang paling dingin di Indonesia. Hasil penelitian menyimpulkan bahwa pendinginan di laut Indonesia disebabkan oleh interaksi angin monsoon tenggara dengan laut. Kata kunci: satelit penginderaan jauh, pendinginan suhu permukaan laut, angin monsoon tenggara

New Record of Mozambique Scorpionfish, Parascorpaena mossambica (Peters, 1855), (Actinopterygii: Order, Scorpaeniformes; Family: Scorpaendiae) From Indian Waters Muddula Krishna Naranji; Govinda Rao Velamala; Kandula Sujatha
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 22, No 3 (2017): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Parascorpaena mossambica is one of the rare species of Scorpaenidae in the Visakhapatnam coastal waters, India. Ten specimens are characterized by Dorsal fin IX 9; Anal fin III 5-6; Pectoral fin rays 15; Lateral line scales 43-44; Lateral line Pored scales 23-24; Lateral transverse scale scales 6-7/1/12-14; lachrymal bone with two lower strong antrose spines, anterior pointed and directed forward, tip reaching dorsal margin of upper lip, covered with skin; posterior one directed forward and slightly downward; suborbital with three spines. Only few records have been made in the whole Indian waters. Due to its rarity, P. mossambica is poorly studied and little known about their biology, ecology and distribution. In the present study provides additional data on this rare species. In particular, we describe its habitat, ecology, presence and distribution with several new records in Indian waters. Keywords: Scorpaenidae, fish, Parascorpaena mossambica, Visakhapatnam

Identifikasi dan Kelimpahan Hama Penyebab Ketidakberhasilan Rehabilitasi Ekosistem Mangrove (Identification and Abundance of Pest Causing Unsuccessful Mangrove Rehabilitation) Irma Dewiyanti; Yunita Yunita
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 18, No 3 (2013): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Peristiwa tsunami pada tahun 2004 mengakibatkan hampir seluruh kawasan mangrove di sepanjang provinsi Aceh rusak. Penghijauan kembali hutan mangrove yang rusak memerlukan upaya rehabilitasi. Salah satu penyebab ketidakberhasilan rehabilitasi adalah adanya jenis hama yang merusak tanaman mangrove tersebut. Tujuan penelitian ini adalah untuk mengidentifikasi jenis hama dan kelimpahannya, serta membandingkan kelimpahan hama antara petak contoh yang berbeda ketinggian pasang-surutnya. Pengambilan data semai dan hama menggunakan transek kuadrat 1m x 1m. Terdapat 4 jenis hama yang ditemukan adalah Balanus amphitrite, Sesarma sp., Pteroma plagiophleps, dan Clibanarius sp. Jenis B. amphitrite memiliki kelimpahan tetinggi, dan terdapat perbedaan yang signifikan antara kelimpahan B. amphitrite dalam petak contoh dekat laut dengan dekat darat. Kestabilan komunitas rendah, ditunjukkan oleh rendahnya keanekaragaman, serta tingginya dominansi jenis. Tinggi dan rendahnya kelimpahan hama tidak dipengaruhi oleh kondisi substrat dan fisika-kimia perairan. Hasil penelitian ini menunjukkan bahwa salah satu penyebab ketidakberhasilan rehabilitasi mangrove di Aceh adalah hama yang didominasi oleh B. amphitrite. Kata kunci: identifikasi, hama, semai, rehabilitasi mangrove, Aceh Due to tsunami event in 2004, wide Aceh areas mangrove forest has been destroyed. Damaging mangrove vegetation will be a problem, especially decreasing the production of organic matter and abration. Rehabilitation is the solution to reforest mangrove area. This program was unsuccessful in some areas because of pest. The purposes of this study were to identify species of pests and their abudance, and to compare the abudance of pest under different inundation regime. Sampling of seedling and pests were studied by using transect quadrate 1m x 1m. In study area was found four kinds of pest, they were Balanus amphitrite, Sesarma sp., Pteroma plagiophleps, and Clibanarius sp. B. amphitrite had the highest abudance, and there was a significantly different the abudance of B. amphitrite between site next to sea and site next to the land. The stability of community was low; it showed by low diversity index, and high dominance. There was a statically correlation between salinity and abudance of pest, so the higher the salinity the higher the pest abudance. The results of this study indicate that one of the causes of the failure of mangrove rehabilitation in Aceh is a pest that is dominated by B. amphitrite. Keywords: identification, pest, seedling, mangrove rehabilitation, Aceh

Model Sebaran Penurunan Tanah di Wilayah Pesisir Semarang Aris Ismanto; Anindya Wirasatriya; Muhammad Helmi; Agus Hartoko; Prayogi Prayogi
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 14, No 4 (2009): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Banjir rob merupakan fenomena bencana yang melanda daerah pesisir Kota Semarang sejak 30 tahun terakhir yang sampai saat ini belum dapat tertanggulangi dan bahkan semakin meluas. Penyebab utama timbulnya banjir rob adalah terjadinya penurunan tanah yang dapat mencapai + 15 cm/tahun. Untuk mengatasi masalah tersebut diperlukan informasi yang akurat mengenai penurunan tanah yang terjadi, terutama mengenai zona sebaran penurunan tanah yang dikaitkan dengan penggunaan lahan. Penelitian ini bertujuan untuk mengetahui sebaran spasial Penurunan Tanah di Pesisir Kota Semarang sehingga diharapkan bisa menjadi acuan bagi Pemerintah Kota Semarang dalam rangka penanggulangan banjir rob. Data spot height peta RBI dan hasil pengukuran lapangan dengan menggunakan DGPS digunakan dalam penelitian ini. Laju penurunan tanah dihitung berdasarkan perbedaan ketinggian wilayah pada saat ini dengan ketinggian wilayah pada spot height peta RBI, tahun 2001. Data citra satelit IKONOS yang didownload dari Google Earth digunakan untuk mengetahui penggunaan lahan eksisting. Pengolahan data dilakukan berbasis Sistem Informasi Geografis dengan menggunakan tool Spatial Analyst pada software Arc GIS 9.1. Hasil penelitian memberikan gambaran bahwa Kota Semarang mempunyai luas 17.073,23 ha dan laju penurunan tanah <1 cm/thn terjadi seluas 3.355,93 ha (19,7%); 1,1-4 cm/thn seluas 6.515,77 ha (38,2%), 4,1-8 cm/thn seluas 5.048,51 (29,6%); 8,1-12 cm/thn seluas 1.685,6 ha (9,9%); dan 12,1-15 cm/thn seluas 467,45 ha (2,7%). Penurunan tanah tersebut menyebar secara spasial di Kecamatan Genuk (8.1-15 cm/th) dan Semarang Utara serta sebagian Semarang Barat (4.1-12 cm/th). Kecamatan Tugu memiliki tingkat penuruan tanah yang relatif rendah, yaitu kurang dari 1 cm/th. Kata kunci: Semarang, Banjir Rob, Penurunan tanah, Since the last 30 years, Tidal flood hazard in the Semarang Coastal Area has never been clearly solved and even getting worse time to time. Most possible cause of this tidal flooding is believed land subsidence which reaches up to 15cm/year. Accurate information of land subsidence distribution, in relation to land use, is therefore needed to ease this flooding problem. The study is aimed to identify spatial distribution of land subsidence in Semarang coastal area which hopefully can be used as scientific reference for Semarang City Government on solving this tidal flooding problem. A spot height data of Indonesian Land Surface (RBI) map was used as the main information of the study collaborated with comprehensive field measurement using DGPS. Land subsidence rate was then calculated as differences between actual height of the location with spot height indicated on 2001 RBI map. An IKONOS satellite image of the same spot was then used to determine existing land use of the area. The dara were processed using a GIS-based analysis ‘Spatial Analyst’ of ArcGIS 9.1. The result showed that among total of 17.073,23 ha of the study area 3.355,93 ha (19,7%) has rate of land subsidence of <1cm/year, 6.515,77 ha (38,2%) of 1.14cm/year, 5.048,51 ha (29,6%) of 4.1-8cm/year, 1.685,6 ha (9,9%) of 8.1-12cm/year and 467,45 ha (2,7%) of 12.1-15cm/year. Spatial distribution of land subsidence in Semarang is spreading in Genuk (8.1-15 cm/th), North Semarang and West Semarang District (4.1-12 cm/th). Land subsidence in Tugu District is relatively lower, that is less then 1 cm/th. Key words: Semarang, tidal flood, land subsidence,

Utility of Underwater Weenie Life Forms as Voluminous Organisms: A Review Rout George Kerry; Samprit Padhiary; Gyana Prakash Mahapatra; Jyoti Ranjan Rout
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 23, No 2 (2018): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Coral reefs are a sundry subaqueous ecological community, combined with the calcium carbonate structures secreted by converting the carbon dioxide present in the water into limestone. The biotic portion of the coral reef is marine animal known as polyps that have resemblance with jellyfish. Unlike terrestrial environment, the marine component is tightly interdependent. Taking out one component or loss of from a system can have a devastating impact or undermine the entire marine ecosystem. Reefs specifically are a vital organism among underwater life which is dependent on corals and provide key microhabitat, shelter and breeding ground for thousands of species of fish, crustaceans, mollusks, etc. Coral reef possesses vital ethnobotanical properties, which cures asthma, arthritis, and even cancer. Apart from medicinal properties, further it provides 2/3rd of oxygen on earth. However, the destructive fishing practices, pollution and ocean acidification have endangered this kingdom and have led to the threatening of the entire fabric of the underwater life. As human beings are also dependent up to much extent for centuries, there is a high probability of being severely affected if the coral reef extinct leaving the seabed barren. Corals cover almost 1 % of the oceans present on earth, but the irony is 75 % of them are on a verge of extinction. Therefore, the present review focuses on its conservation, cultivation and significance of their application in the field of biomedical science.Keywords: Coral reef, endangered, ethnobotany, extinction, marine ecosystem, pollution.

Dinamika Populasi Udang Jerbung (Penaeus merguiensis De Man 1907) di Laguna Segara Anakan, Cilacap, Jawa Tengah Suradi W Saputra; Subijanto Subijanto
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 12, No 3 (2007): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Penelitian dinamika populasi udang Jerbung (Penaeus merguiensis) dilakukan di Laguna Segara Anakan Cilacap Jawa Tengah berdasarkan data frekuensi panjang karapas, yang dikumpulkan sejak Februari sampai Agustus 2006, menggunakan metode survei. Data dianalisis menggunakan alat bantu software dari program FiSAT (FAO-Iclarm Stock Assessment Tool) II. Hasil perhitungan diperoleh ukuran rata-rata udang Jerbung pertama tertangkap a/at (apong) pada panjang karapas 18 mm atau pada bobo 3,34 gram. Panjang karapas maksimum udang Jerbung 34,5 mm dan L. sebesar 37,5 mm, dengan indeks kurva pertumbuhan K adalah 1,4/tahun dan t adalah -0,00875 tahun. Waktu terjadinya pertumbuhan maksimum (tt,B) adalah 0,63 tahun. Panjang karapas saatpertumbuhan maksimum 22,2 mm. Laju kematian total (Z) sebesar 7,02/tahun, laju kematian alami (M) sebesar 1,96/tahun dan Fsebesar 5.06/tahun. Laju eksploitasi (E) sebesar 0,72 per tahun, menunjukan tingkat pengusahaan berlebih atau telah terjadi growth-overfishing, sehingga perlu pengendalian laju eksploitasi. Kata kunci : Dinamika populasi, P. merguiensis, Laguna Segara Anakan Study of population dynamic of Penaeus merguiensis (Banana Shrimp) at Segara Anakan Lagoon, Cilacap, Cenral Java, Indonesia, based on length carapace frequencies data, was carry out since February to Agustus 2006. Data were analysed by using FiSA T (FA O-Idarm Stock Assessment Tool) II. The result showed that the first shrimp captured has carapace length i.e. 18 mm and the body weight was 3,34g. Maximum carapace length found was 34,5 mm and L,, was 37,5 mm. While index of curve growth (K) was 1,4/year and to was - 0,00875/year. Time ofmaximum growth point is 0,63/year, on carapace length was 22,2 mm. Total mortality (Z) was 7,02/years, natural mortality 1,96/year and fishing mortality was 5.06/year. Exploitation rate (E) was found 0.72/year. It suggests that over-exploitation orgrowth-overffshinghas occured in this area and therefore, it needs exploitation managementKey words : Population dinamic, P. merguiensis, Segara Anakan Lagoon

Kerapatan dan Kelulushidupan pada Rekrutmen Karang Pocillopora damicornis (Density and Survivorship on the Recruitment of the brooding coral Pocillopora damicornis) Munasik Munasik; Suharsono Suharsono; J Situmorang; Kamiso H N
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 19, No 3 (2014): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Studi rekrutmen karang Pocillopora damicornis telah dilakukan dengan mengamati kerapatan juvenil pada substrat penempelan di dataran terumbu Pulau Panjang, Jepara, Jawa Tengah. Hasil menunjukkan bahwa rekrutmen terjadi sepanjang tahun dan tertinggi pada periode Agustus-Oktober. Laju rekrutmen karang di belakang terumbu (back reef) pada sisi bawah angin (selatan) lebih tinggi daripada di sisi atas angin (utara) Pulau Panjang, tampaknya hal ini berkorelasi dengan kerapatan populasi karang dewasanya. Kerapatan juvenil karang tertinggi pada substrat batu alam terjadi pada sisi bawah permukaan substrat, akan tetapi pertumbuhan juvenil karang tertinggi ditemukan di sisi atas permukaan substrat. Hal ini mengindikasikan bahwa kerapatan juvenil karang berhubungan dengan kelulusan hidup juvenil karang. Semakin tinggi kerapatan juvenil karang P. damicornis maka semakin rendah kelulusan hidup juvenil karang karena terjadinya peningkatan persaingan sesama juvenil karang dan akibat kekurangan cahaya. Kata kunci: rekrutmen, kerapatan, kelulushidupan, karang Pocillopora damicornis Recruitment of the brooding coral Pocillopora damicornis was studied by observing the juvenile density on the settlement plate substrate in reef flat of Panjang Island, Jepara, Central Java. The results show that recruitment occurs throughout the year and the highest in the period from August to October. The rate of recruitment of coral reefs in back reef on the leeward (south) is higher than on the windward (north) of the island, it seems to be correlated with population density of adult corals. The highest density of juvenile corals on natural substrata occurs on the lower side surface of the substrate, but the highest growth of juvenile are found on the upper side surface of the substrate. This indicates that the density of juvenile corals associated with the survival of juvenile corals. The higher density of juvenile corals P. damicornis, the lower the survival of juvenile corals due to an increase in competition among juvenile corals and due to lack of light. Keywords: recruitment, density, survivorship, coral Pocillopora damicornis

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