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"Telah dilakukan penelitian tentang sebaran spasial fitoplankton di lokasi budidaya kerang hijau (Perna viridis) Kamal Muara, Jakarta Utara. Penelitian bertujuan mengetahui kelimpahan dan sebaran spasial fitoplankton, serta parameter lingkungan yang memengaruhi. Berdasarkan peta sebaran, kelimpahan Bacillariophyceae dan Dinophyceae lebih tinggi pada stasiun-stasiun yang dekat dengan daratan (Stasiun 1 dan Stasiun 2), sedangkan kelimpahan Cyanophyceae ditemukan lebih tinggi pada stasiun-stasiun yang jauh dari daratan (Stasiun 5 dan Stasiun 9). Analisis Regresi Multivariat menunjukkan bahwa seluruh parameter lingkungan terukur berpengaruh terhadap kelimpahan fitoplankton. Nilai korelasi Spearman menunjukkan bahwa kelimpahan Bacillariophyceae paling dipengaruhi oleh pH, kelimpahan Dinophyceae paling dipengaruhi oleh salinitas, sedangkan kelimpahan Cyanophyceae paling dipengaruhi oleh fosfat.

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Research on the spatial distribution of phytoplankton has been held in the green mussel aquaculture area (Perna viridis) Kamal Muara, North Jakarta. The research aim to determine the abundance and spatial distribution of phytoplankton and environmental parameters influenced. Based on distribution maps, the abundance of Bacillariophyceae and Dinophyceae were highest at stations near mainland (Station 1 and Station 2), whereas Cyanophyceae was at farther stations (Station 5 and Station 9).

Regression Multivariate analysis showed that all measured environmental parameters were influencing the abundance of phytoplankton. Spearman correlation values indicate that the abundance of Bacillariophyceae were most influenced by pH, Dinophyceae by salinity, whereas Cyanophyceae by phosphate."

"Telah dilakukan penelitian mengenai sebaran spasial spesies Harmful Algal Bloom (HAB) di lokasi budidaya kerang hijau (Perna viridis) Kalibaru, Cilincing, Jakarta Utara pada bulan Mei 2012. Sampel diambil secara vertikal dari kedalaman 3 meter dan pencacahan dilakukan dengan metode sub sampel. Hasil pencacahan menemukan 9 spesies penyebab HAB yang berpotensi red tide maker dan toxin producer. Berdasarkan peta sebaran, kepadatan tertinggi spesies penyebab HAB terdapat di stasiun yang dekat dengan garis pantai (Stasiun 1). Berdasarkan hasil Analisis Faktorial Koresponden (AFK) dan Analisis Komponen Utama (AKU) diketahui bahwa Stasiun 1 dicirikan oleh Thalassiosira mala yang dipengaruhi oleh kecepatan arus dan intensitas cahaya.

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Research on the spatial distribution of Harmful Algal Bloom (HAB) species at green mussel (Perna viridis) aquaculture area, Kalibaru, Cilincing, North Jakarta has been held in May 2012. Samples from 3 meter depth were taken vertically and then identified using sub sample method.

The results showed 9 HAB phytoplankton species which potentially red tide maker and toxin producer. Based on the distribution map, the highest density of HAB species is at station close to the shoreline (Station 1). Based on Correspondent Analysis (CA) and Principle Component Analysis (PCA), Station 1 is characterized by Thalassiosira mala and are affected by current velocity and light intensity."

"ABSTRAKTelah dilakukan penelitian mengenai analisis sebaran kelimpahan kista Dinoflagellatapenyebab HAB di lokasi budidaya kerang hijau (Perna viridis) Kamal Muara, Jakarta Utara,pada bulan Oktober 2014 di 9 titik stasiun. Tujuan dari penelitian ini adalah untukmengetahui keberadaan serta kelimpahan kista Dinoflagellata penyebab HAB, memetakansebaran spasial kista Dinoflagellata penyebab HAB, dan untuk mengetahui faktor lingkunganyang memengaruhi sebaran kista Dinoflagellata penyebab HAB. Pengambilan sampelsedimen dilakukan menggunakan Eijkman Grab, dan pemisahan kista dari sampel sedimendilakukan menggunakan metode sieving technique. Hasil penelitian menunjukkan bahwaterdapat 8 genus kista Dinoflagellata di lokasi penelitian, yaitu Alexandrium, Cochlodinium,Diplopsalis, Gonyaulax, Gymnodinium, Polykrikos, Protoperidinium, dan Scrippsiella,dimana 5 diantaranya merupakan genus penyebab HAB, yaitu Alexandrium, Cochlodinium,Gonyaulax, Gymnodinium, dan Scrippsiella. Kelimpahan kista di sedimen lokasi penelitianmemiliki kisaran antara 4--324 kista/ml. Kista dengan kelimpahan tertinggi adalah genusAlexandrium (324 kista/ml) dan terendah adalah genus Diplopsalis (4 kista/ml). Pola sebarankista di lokasi penelitian menunjukkan bahwa kista terkonsentrasi pada stasiun-stasiun diwilayah timur. Faktor lingkungan yang paling memengaruhi sebaran kista di lokasipenelitian adalah arus, sedangkan faktor lingkungan yang memengaruhi germinasi kistaadalah DO, cahaya, dan suhu.

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ABSTRACTResearch on the distribution analysis on the cyst abundance of HAB causing Dinoflagellatesat green mussel (Perna viridis) culture area in Kamal Muara, North Jakarta, has beenconducted in October 2014 at 9 sampling stations. The objectives of the research were todetermine the presence and abundance, mapping the spatial distribution, and to determine theenvironmental factors that influence the distribution of cysts from HAB causingDinoflagellates. Sediment sampling was carried out using Eijkman Grab. Cyst samplepreparation was carried out using the sieving technique. The results showed 8 genus ofDinoflagellate cysts, which were Alexandrium, Cochlodinium, Diplopsalis, Gonyaulax,Gymnodinium, Polykrikos, Protoperidinium, and Scrippsiella, in which 5 of them were HABcausing, namely Alexandrium, Cochlodinium, Gonyaulax, Gymnodinium, dan Scrippsiella.The abundance of cyst at sediments were ranged between 4--324 cysts/ml. Cyst with highestabundance was genus Alexandrium (324 cysts/ml) and the lowest was genus Diplopsalis (4cysts/ml). Cyst distribution pattern at the study site showed that cysts were concentrated atstations located in the eastern region. Environmental factors that mostly influence thedistribution of cysts in the study site was water current, whereas environmental factors thataffect the germination of cysts was DO, light, and temperature."

"Penelitian bertujuan untuk mengetahui kelimpahan mikroplastik pada kerang hijau Perna viridis berbagai ukuran, mengetahui organ tubuh kerang hijau yang paling banyak menyimpan mikroplastik, serta mengetahui korelasi antara kelimpahan mikroplastik pada kerang hijau, air, dan sedimen. Sampel kerang hijau, air, dan sedimen diambil dari 3 stasiun berbeda dengan jarak masing-masing sekitar 500 m. Analisis kelimpahan mikroplastik dilakukan dengan cara mengisolasi mikroplastik pada setiap sampel. Isolasi pada sampel kerang dilakukan dengan melarutkan kerang di dalam larutan HNO3 65, sementara sampel air dan sedimen dilakukan dengan cara pemisahan berdasarkan ukuran dan massa jenis dengan perendaman dalam larutan NaCl jenuh. Hasil yang didapatkan, yaitu rata-rata kelimpahan mikroplastik pada kerang hijau ukuran 3, 6, dan 9 cm, yaitu 5,35; 24,99; dan 39,00 partikel/gram. Mikroplastik kelompok fiber dominan pada sampel kerang. Rata-rata kelimpahan mikroplastik di air dan sedimen, yaitu 13,15 partikel/L air laut dan 0,92 partikel/g sedimen kering. Mikroplastik kelompok film dominan pada sampel air dan sedimen. Sementara, kelompok pelet tidak ditemukan pada ketiga sampel. Terdapat korelasi antara kelimpahan mikroplastik dengan ukuran cangkang kerang, maupun dengan kelimpahan mikroplastik kelompok film dan fiber pada air dan sedimen.

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Research on abundance of microplastic in green mussel Perna viridis, water and sediments in Kamal Muara, North Jakarta has been done. The research determined the abundance of microplastic in green mussel of various sizes, the organ of the green mussels most storey microplastic, and the correlation between abundance of microplastic in green mussel, water, and sediment. Samples of green mussel, water and sediments were taken from 3 different stations with a distance of about 500 meters each. Analysis of abundance of microplastic was done by isolating microplastic in each sample. The isolation of the green mussel samples was done by dissolving the mussels in the HNO3 solution, while the water and sediment samples were performed by separation by size and density by immersion in a saturated NaCl solution.

The results obtained were, on average, abundance of microplastic in green mussel size 3, 6, and 9 cm ie, 5.35 24.99 and 39,00 particles gram. Microplastic fiber was dominant in mussel sample. The average abundance of microplastic in water and sediment are 13.15 particles L of sea water and 0.92 particles gram of dry sediment. Microplastic film was dominant in water and sediment samples. Meanwhile, pellet was not found in all three samples. There was a correlation between abundance of microplastic with green mussel size, as well as with abundance of microplastic of film and fiber in water and sediment."

"Penelitian mengenai uji toksisitas dan distribusi kandungan fikotoksin pada kerang hijau (Perna viridis) telah dilakukan di kawasan budidaya kerang hijau, Kamal Muara pada bulan Mei 2012. Penelitian bertujuan untuk mendeteksi keberadaan fikotoksin penyebab Paralytic Shellfish Poisoning (PSP), serta mengetahui tingkat toksisitas dan distribusi fikotoksin pada bagian visceral, mantel, dan otot dari kerang hijau. Berdasarkan Jellet Rapid Test, hasil penelitian menunjukkan bahwa tidak terdapat racun penyebab PSP dalam kerang hijau. Berdasarkan BSLT, hasil menunjukkan bahwa terdapat senyawa aktif yang bersifat toksik pada seluruh bagian tubuh kerang yang diuji karena semua nilai LC50 yang didapatkan kurang dari 1.000 ppm. Nilai LC50 yang terendah pada bagian visceral (63,75 ppm, 105,5 ppm, dan 74,64 ppm) diikuti dengan jaringan mantel (211,8 ppm, 335,74 ppm, dan 306, 67 ppm) dan jaringan otot (459,95 ppm, 529,05 ppm, dan 492,06 ppm). Hasil tersebut mengindikasikan bahwa tidak terdapat racun penyebab PSP pada kerang hijau, namun terdapat fikotoksin lain pada sampel kerang hijau yang terdistribusi pada bagian tubuh yang berbeda dengan konsentrasi tertinggi pada bagian visceral.

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The research on toxicity test and phycotoxin distribution in green mussel (Perna viridis) had been done on Kamal Muara aquaculture area in May 2012. The research aimed to detect the Paralytic Shellfish Poisoning (PSP) causing phycotoxin and to know the toxicity levels and distribution on green mussels viscera, mantle, and muscles. Based on Jellet Rapid Test, the result showed that there were no PSP toxins inside the mussels.

Based on Brine Shrimp Lethality Test (BSLT), there was other active compound with toxic properties for all the LC50 levels that were lower than 1.000 ppm. The LC50 levels were lowest on the viscera (63,75 ppm, 105,5 ppm, and 74,64 ppm), followed by the mantle (211,8 ppm, 335,74 ppm, and 306, 67 ppm) and muscles (459,95 ppm, 529,05 ppm, and 492,06 ppm). Those results indicated that there were no PSP toxins inside mussels, but there were other phycotoxins distributed in different body parts with highest concentration in viscera."

"Dalam penelitian ini dilakukan studi mengenai depurasi logam berat Ni dan Cr yang diamati dari spesies Perna viridis atau Kerang Hijau yang diperoleh dari perairan Muara Kamal, Jakarta Utara. Terlebih dahulu ditentukan kadar logam Ni dan Cr dalam daging Perna viridis sebagai kontrol tanpa perlakuan. Kemudian dilakukan depurasi dengan perendaman asam asetat 1%, 3%, 5%, 10% serta air bersuhu 60 0C, 80 0C, dan 100 0C dengan variasi waktu 1, 2, dan 4 jam tanpa dan disertai pengadukan. Hasil kadar logam Ni yang diperoleh untuk kelompok kontrol adalah 2.113 mg/kg dan untuk Cr adalah 3.426 mg/kg. Didapatkan penurunan kadar logam paling besar yaitu dengan perlakuan perendaman asam asetat 10% selama 4 jam disertai pengadukan, kadar logam untuk Ni menjadi 0.085 mg/kg dan Cr 1.492 mg/kg. Ditentukan juga kadar protein sebelum dan sesudah depurasi dengan metode Kjeldahl untuk menyelidiki kemungkinan kerusakan dan hilangnya asam amino. Kadar protein sebelum depurasi yaitu 20.544 % dan setelah depurasi untuk penurunan kadar logam paling besar yaitu 20.475 %.

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In this research, the study of heavy metal depuration, Ni and Cr in marine species (Perna viridis) from Kamal Estuary, North Jakarta were observed. Firstly, the concentration of Ni and Cr in Perna viridis was determined as controls. Then, do the depuration with acetic acid dipping in various concentration 1%, 3%, 5%, 10% and in variation temperature of waters, that is 60 0C, 80 0C, 100 0C with time varieties 1, 2, and 4 hours without and with stirring.

For the control group, Ni metal content obtained was 2.113 mg/kg and for Cr was 3.426 mg/kg. The greatest decrease in metal content is by immersion treatment of 10% acetic acid for 4 hour with stirring, those are 0.085 mg/kg for Ni and 1.492 mg/kg for Cr after treatment. Protein content was also determined before and after depuration by Kjeldahl method to investigate the possibility of damage and loss of amino acids. Protein content before depuration is 20.544% and for treatment after depuration with the greatest decrease in metal content is 20.475%."

"Telah dilakukan penelitian tentang uji toksisitas dan deteksi kandungan fikotoksin pada kerang hijau di lokasi budidaya kerang hijau Kalibaru, Cilincing, Jakarta Utara. Tujuan penelitian ini adalah untuk mengetahui tingkat toksisitas kandungan fikotoksin pada kerang hijau dengan metode BSLT, mendeteksi kandungan saksitoksin pada sampel kerang hijau dan fitoplankton dengan Jellett Rapid PSP Test, dan membandingkan hasil KLT pada ekstrak kerang hijau dan fitoplankton. Hasil BSLT dengan analisis probit menunjukkan bahwa semua stasiunmengandungsenyawaaktifbersifattoksikdengannilaiLC50 <1000ppm, yaitu berkisar antara 96,257--125,231 ppm. Hasil Jellett Rapid PSP Test menunjukkan tidak terdapat kandungan saksitoksin pada kerang hijau dan fitoplankton. Hasil KLT menunjukkan komponen senyawa aktif pada kerang hijau tidak sama dengan sampel fitoplankton.

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Research on toxicity test and detection of phycotoxin content in green mussels was conducted at green mussels aquaculture area at Kalibaru, Cilincing, North Jakarta. The aims of this research are to detect toxicity levels of phycotoxin content in green mussels by BSLT, to detect the content of saxitoxin in green mussels and phytoplankton by Jellett Rapid PSP Test, and to compare the results of TLC from the green mussels and phytoplankton extract.

The BSLT result by probit analysis showed that the green mussels at every stations contained active compounds with toxic properties, and LC50 < 1000 ppm with range values 96,257- -125,231 ppm. The Jellett Rapid PSP Test showed that there is no saxitoxin in green mussels and phytoplankton samples. TLC result showed that there was no similarity on compounds between green mussels and phytoplankton samples."

"Telah dilakukan penelitian tentang sebaran spasiotemporal spesies HAB di lokasi budidaya kerang hijau (Perna viridis), Kamal Muara, Jakarta Utara pada bulan Mei-Oktober 2011. Sampel diambil secara vertikal di sembilan stasiun dengan plankton-net, dan dilakukan pula pengukuran parameter lingkungan. Spesies HAB yang ditemukan berasal dari kelas Raphidophyceae, Bacillariophyceae, dan Dinophyceae, didominasi oleh Ceratium furca, Chaetoceros spp., Gonyaulax polygramma, Nitzschia spp., Prorocentrum micans, Skeletonema costatum, dan Thalassiosira spp. Berdasarkan peta isoplank diketahui bahwa sebaran terpadat terjadi pada bulan Mei dan Oktober, yaitu di stasiun dekat muara. Berdasarkan Analisis Komponen Utama (AKU) dan Analisis Faktorial Korespondensi (AFK), diketahui bahwa terdapat perbedaan faktor lingkungan penciri di setiap bulan pengamatan yang menyebabkan perbedaan sebaran spesies HAB tertentu. Research on spatiotemporal distribution of HAB species at green mussel (Perna viridis) farming area, Kamal Muara, North Jakarta has been conducted in May to October 2011. Samples were taken vertically at nine stations using plankton-net, and environmental parameters were also measured. The classes of HAB species found in this research were Raphidophyceae, Bacillariophyceae, and Dinophyceae, dominated by Ceratium furca, Chaetoceros spp., Gonyaulax polygramma, Nitzschia spp., Prorocentrum micans, Skeletonema costatum, and Thalassiosira spp. Based on isoplank map, the densest distribution was at stations near river mouth, especially in May and October. Based on the Principle Component Analysis (PCA) and Correspondence Analysis (CA) results, there were differences in environmental factor characterized each month, which will cause differences in the distribution of certain HAB species."

"Telah dilakukan penelitian mengenai struktur komunitas dan sebaran spasial Bivalvia serta hubungannya dengan karakteristik lingkungan di Teluk Katania, Seram Barat, Maluku Tengah. Ada 5 stasiun penelitian yaitu : Pelita Jaya 1, Pelita Jaya 2, Pulau Buntal, Pulau Tatumbu, dan Pulau Burung. Anadara maculafa merupakan jenis Bivalvia yang kepadatannya tertinggi (2,5 individu/m2). Nilai H' (indeks keanekaragaman) Bivalvia tertinggi ada di Pulau Burung (H' = 0,958) dan terendah di Pulau Buntal (H' = 0,624). Indeks kemerataan J' tertinggi (J' = 0,843) terdapat di Pelita Jaya 1. indeks kesamaan Morisita C tertinggi adalah antara Pelita Jaya 2 dan Pulau Buntal (C = 0,92). Kondisi substrat di Pelita Jaya 2 dan Pulau Buntal mempunyai persentase Lumpur yang tinggi. Dengan analisis cluster, 5 stasiun penelitian terbagi menjadi 2 kelompok. Kelompok I terdiri atas stasiun Pelita Jaya 2 dan Pulau Buntal kemudian kelompok II terdiri atas Pelita Jayal, Pulau Tatumbu, dan Pulau Burung. Analisis diskriminan dengan faktor lingkungan substrat pasir halus dan lumpur juga membagi kelima stasiun menjadi dua kelompok yang sama seperti pada analisis cluster. Substrat lumpur mempunyai kontribusi yang tinggi (96,3 %). Tellina sp merupakan jenis yang penyebarannya luas sebab selalu hadir di setiap stasiun penelitian. Hasil analisis faktorial koresponden membentuk enam kelompok. Penyebaran spasial jenis jenis Bivalvia di 5 stasiun dari hasil analisis tersebut berdasarkan pada kepadatan tertinggi dari jenis jenis tertentu (lima kelompok) dan berdasarkan jenis-jenis yang selalu hadir di setiap stasiun (satu kelompok).

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Bivalvia, also known as Pelecypoda, is the second largest class in phylum Mollusca. This group has 28.000 species (Barth & Broshear, 1982) and about 1000 species of Bivalvia live in Indonesian waters (Nontji, 1987). Information about Bivalvia in Kotania Bay has not been known well. Based on those fact, a research on the community structure and spatial distribution of Bivalve in the waters of Kotania Bay was conducted in February 1996. The aim of study was to find out the relationship between Bivalvia community structure with environmental factors in the waters of Kotania Bay. The spatial distribution of Bivalvia in several small islands in Kotania Bay was also studied. Hopefully, the results can be used as basic information for father research.

The research was conducted in five stations, i.e. Pelita Jaya 1, Pelita Jaya 2, Buntal Island, Tatumbu Island, and Burung Island. The sampling method used in the study was belt transact. The water conditions measured were water temperature, salinity, and pH. The substrates were characterized by the sediment fractions. Temperatures in the research stations ranged between 29.5°C and 31 °C, the range of pH is between 7 and 8.4. Water salinities in the research stations varied between 22 % and 30 %. Substrates in the research stations mostly contained sand with the very high percentage of very coarse sand. Silt was the smallest fraction found in the substrate.

In five research stations, 32 species of Bivalvia belonging to 15 families were collected. Anadara maculata had the highest density (2.5 individulm2) of all Bivalvia species found. The highest H' value (diversity index) of Bivalvia was in Burung Island (H' = 0.958) and the lowest was in Buntal Island (H' = 0.624). The highest evenness index J' = 0.843 was found in Pelita Jaya 1. The highest similarity index was shown by Pelita Jaya 2 and Buntal Island. Substrates in Pelita Jaya 2 and Buntal Island were dominated by silt.

Cluster analysis at five research stations divided the stations into two groups. Group I, defined by Pelita Jaya 2 and Buntal Island. Group ii, defined by Pelita Jaya 1, Tatumbu Island, and Burung Island. Discriminant analysis based on two environmental factors, i.e. very fine sand and silts, also divided the stations into two similar groups as cluster analysis did. The silt factor had high contribution (96.3%) in separating the stations.

Factorial correspondence analysis classified the species of Bivalvia into six groups. Based on the highest density of the certain species (five groups) and on the common species found in all stations (one group). Among the species collected Tellina sp was the common species found in the five stations. Spondylus squamosus, Trachydarium subrugosum, and Vulsella vulsella were found only in Pelita Jaya 2. Pitar subpellucidus, Septifer hi/ocular-is, Fimbria fmbriata and Chama pacifica were found only in Burung island. The species of Bivalvia only found in Pelita Jaya 1 were Atrina vexillum, Tellina staurella, Chama ruderalis, Limaria fragilis, and Clycymeris pectunculus."

"[ABSTRAKbrPenelitian mengenai struktur komunitas diatom epifit pada daun lamun di padang lamun perairan Muara Binuangeun, Banten telah dilakukan pada tanggal 30 April -- 3 Mei 2015. Penelitian bertujuan untuk mengetahui struktur komunitas Diatom epifitik pada daun lamun Thalassia hemprichii (Ehrenb. ex Solms) Asch. antara lain, komposisi genus, kepadatan, dominansi, keanekaragaman, dan kemerataan pada setiap stasiun di Muara Binuangeun, Kabupaten Lebak, Banten. Penentuan lokasi pengambilan sampel dilakukan secara purposive sampling. Hasil penelitian menunjukan bahwa komposisi Diatom epifitik yang diperoleh di lokasi penelitian sebanyak 12 genus dari 4 kelas. Kepadatan Diatom epifitik tiap stasiun berkisar antara 91800 – 420560 sel/ dm2. Nilai indeks dominansi berkisar antara 0,617—0,917 dan tergolong tinggi di setiap stasiun, hal tersebut disebabkan karena terdapat genus Navicula yang mendominasi disetiap stasiun. Nilai indeks keanekaragaman di setiap stasiun penelitian tergolong rendah (berkisar antara 0,25—0,86). Nilai indeks kemerataan berkisar antara 0,1—0,36 dengan stasiun 1 dan 4 tergolong tidak merata, sedangkan pada stasiun 2 dan 3 tergolong kurang merata. Rendahnya nilai indeks keanekaragaman dan kemerataan disebabkan karena adanya tekanan ekologis pada lokasi penelitian. Secara umum, struktur komunitas Diatom epifitik pada lokasi penelitian tergolong tidak stabil karena tingkat dominansi yang tinggi, keanekaragaman yang rendah, dan kemerataan yang tidak merata dan kurang merata.;Research on community structure of epiphyte Diatom on Thalassia hemprichii (Ehrenb. ex Solms) Asch. leaves at seagrass beds Muara Binuangeun Coastal, Kabupaten Lebak, Banten was conducted on 30 April -- 3 May 2015. The aim of this study was to determine community structure of epiphyte Diatom on Thalassia hemprichii (Ehrenb. ex Solms) Asch. leaves include genus composition, abundance, dominance, diversity, and evenness each stations at Muara Binuangeun, Kabupaten Lebak, Banten. Sampling location was determineted by purposive sampling method. Result shows that 4 classis 12 genera Diatom epiphytic composition was obtained . Diatom epiphytic abundance range in each station was 91800 – 420560 sel/ dm2. Dominance index score range was 0,617—0,917 and was classified as high at each stations because genus Navicula dominant in each stations. Diversity index score was classified as low (0,25—0,86) at each stations. Evenness index score range was 0,1—0,36 with station 1 and 4 classifed as highly unevenn and station 2 and 3 was classified as unevenly. Diversity and evenness index score was low because there were ecological pressures. In general, community structure of epiphyte Diatom in research location was unstable because dominance index was high, diversity index was low, and evenness index was highly uneven and unevenly., Research on community structure of epiphyte Diatom on Thalassia hemprichii (Ehrenb. ex Solms) Asch. leaves at seagrass beds Muara Binuangeun Coastal, Kabupaten Lebak, Banten was conducted on 30 April -- 3 May 2015. The aim of this study was to determine community structure of epiphyte Diatom on Thalassia hemprichii (Ehrenb. ex Solms) Asch. leaves include genus composition, abundance, dominance, diversity, and evenness each stations at Muara Binuangeun, Kabupaten Lebak, Banten. Sampling location was determineted by purposive sampling method. Result shows that 4 classis 12 genera Diatom epiphytic composition was obtained . Diatom epiphytic abundance range in each station was 91800 – 420560 sel/ dm2. Dominance index score range was 0,617—0,917 and was classified as high at each stations because genus Navicula dominant in each stations. Diversity index score was classified as low (0,25—0,86) at each stations. Evenness index score range was 0,1—0,36 with station 1 and 4 classifed as highly unevenn and station 2 and 3 was classified as unevenly. Diversity and evenness index score was low because there were ecological pressures. In general, community structure of epiphyte Diatom in research location was unstable because dominance index was high, diversity index was low, and evenness index was highly uneven and unevenly.]"