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"Penelitian mengenai Polychaeta di hutan mangrove, perairan Teluk Kotania, Seram Barat telah dilakukan pada bulan Februari 1996. Dari sampel yang telah dikumpulkan diketahui bahwa di lokasi Teluk Kotania terdapat 40 jenis Polychaeta yang digolongkan ke dalam 36 marga dan 13 suku. Dua jenis di antaranya mempunyai frekwensi kehadiran yang tinggi yaitu Pulliella sp dan Armandia intermedia masing-masing (89%). Rata-rata kepadatan individu Polychaeta di lima lokasi berkisar antara 12.102 individu/m3 - 21.307 individu/m3 , keanekaragaman jenis berkisar antara 2,44 - 3,78 dan kemerataan jenis berkisar antara 0,56 - 0,78. Nilai indeks keanekaragaman dan kemerataan jenis di lima lokasi penelitian sangat ditentukan oleh kontribusi Pulliella sp dan Armandia intermedia. Hasil pengukuran terhadap faktor fisik lingkungan diperoleh kisaran nilai rata-rata salinitas 22,50/00 - 27°loo; suhu 29,5°C - 31°C dan pH 7,8 - 8,4. Sedangkan hasil analisis terhadap tekstur sedimen menunjukkan bahwa umumnya lokasi penelitian bersubstrat pasir sangat kasar, kecuali Pulau Burung didominasi oleh pasir sedang. Hasil analisis cluster dan analisis diskriminan di lima lokasi membentuk dua kelompok. Kelompok I terdiri atas Pulau Tatumbu dan Pulau Burung, sedangkan kelompok II terdiri dari Pelita Jaya 2, Pulau Buntal, dan Pelita Jaya I. Pengelompokan tersebut berdasarkan kepadatan jenis dan substrat. Janis Polychaeta yang menyebar pada jarak 0 - 45 m adalah Armandia intermedia, Pulliella sp dan Aphelia sp. Hasil analisis koresponden mendapatkan bahwa pengelompokan terbentuk berdasarkan kepadatan dan spesifikasi jenis di lokasi tertentu.

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Polychaeta is a group of invertebrates which is important in the marine food chain, particularly for demersal fishes, shrimps, and crabs. Polychaeta lives in various habitats, in muddy, sandy, and stony bottoms. Information about Polychaeta in Indonesian waters, especially in Maluku waters, has not yet been known well. Based on those fact, a research on the community structure and distribution of Polychaeta of mangrove forest in the waters of Kotania Bay was conducted in February 1996. Samples were collected from five stations using a transect method. The aim of the study was to find out the relationship of Polychaeta community structure with the environmental factors in Kotania Bay. The distribution of Polychaeta of mangrove forest in Kotania Bay was also studied. Hopefully, the results of this study can be used as basic information for futher research. During the study, 40 species of Polychaeta belonging to 36 genera of 13 families were collected from the locality. Two species showed high frequency of occurrence (89%), i.e. Pa/lie/la sp and Armandia infermedia. This indicated that the two species were common and distributed more widely than the others. The highest' density of Polychaeta was in Burung Island (21.307 indlm3) and the lowest was in Pelita Jaya 1 (12.102.ind/m3). The highest density of Polychaeta in Burung Island was mainly due to the highest density of Pulliella sp, Armandia intermedia, and A. lepfocirrus. The highest diversity and evenness indeces of Polychaeta species were found in Buntal island. Tatumbu Island and Burung Island had the highest similarity index. The water conditions of Kotania Bay showed that salinity ranged from 22,5°100 to 27°1°0, temperature ranged from 29,5°C to 31°C, and pH varied between 7,8 and 8,4. Substrates mostly contained sand with the very high percentage of very coarse sand. Cluster analysis divided the five station into two groups : Group 1, defined by Tatumbu Island and Burung Island, and Group II, defined by Pelita Jaya 2, Buntal Island, and Pelita Jaya 1. Discriminant analysis also divided the stations into two groups. Medium sand in the substrat was responsible in separating the five stations into two different communities. Factorial Correspondence Analysis (CA) classified the species of Polychaeta into four group based on species densities and specification of species in the location."

"Penelitian telah dilakukan di Teluk Jakarta mengenai pemodelan hubungan antara struktur komunitas mangrove dengan stok karbon dan kondisi fisika kimia perairan. Penelitian ini bertujuan untuk mendesain pola hubungan yang terjadi antara struktur komunitas mangrove dengan stok karbon dan kondisi fisika kimia perairan di Teluk Jakarta. Desain model didapatkan setelah melalui serangkaian penelitian lapangan di Teluk Jakarta yang berada di Tangerang-Jakarta Utara-Bekasi, sehingga didapatkan data primer dan sekunder. Pembuatan model ini menggunakan pemodelan system dynamic dengan software powersim studio 10 kemudian dilakukan simulasinya. Hasilnya adalah hubungan antara struktur komunitas mangrove dengan stok karbon dan kondisi fisika kimia perairan mengalami pertumbuhan yang lambat. Hutan mangrove yang terletak di pesisir Teluk Jakarta telah mengalami suksesi dan seleksi alam sehingga terjadi dominansi dari spesies Avicennia marina, A.Lanata, Rhizophora aviculata, R.Mucronata, Soneratia caseolaris, S.Alba. Rata-rata Indeks Nilai Penting (INP) hutan mangrove ini adalah rendah yaitu untuk tingkat pohon sebesar 113,57%, tingkat anakan 92,93%, dan tingkat semai 80,60%. Rendahnya INP ini menyebabkan kandungan stok karbon rendah yaitu 10,214 t.C/ha (hubungan positif). Hasil pemodelan memperlihatkan daya ungkit dari permasalahan ini adalah debit air sungai (207,775 m³/detik/hari), dan arus laut pantai (0,04 m/detik). Kedua parameter ini menyebabkan perubahan secara signifikan pada parameter lain yaitu parameter salinitas, oksigen terlarut, logam berat, dan kecerahan yang berpengaruh pada pertumbuhan dan kehadiran spesies mangrove. Semakin besar debit air dan semakin kecil arus air laut, maka semakin lambat pertumbuhannya. Oleh karena itu perbaikan dalam pengelolaan hutan mangrove pada daerah terganggu seperti ini perlu dilakukan dengan memfokuskan pada perbaikan daya ungkitnya, sehingga efisiensi dan efektifitas dalam pengelolaan hutan mangrove dapat dilakukan. Harapan dari hasil penelitian ini adalah agar ekosistem hutan mangrove yang berada didaerah terganggu dapat terselamatkan.

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Research has been carried out at Jakarta Bay regarding of the relationship between mangrove community structure and carbon stocks and physical chemical condition of marine water. This study aims to design the pattern of relationships that occured between the structure of mangroves community, carbon stocks, and the physical chemical conditions of the coastal marine waters in Jakarta Bay. The model design was obtained after going through a series of field studies in Jakarta Bay located in Tangerang-North Jakarta-Bekasi, so the primary and secondary data were obtained. Designed this model by system dynamic modeling using software powersim studio 10 then simulating. The result was obtained relationship between the structure of magrove community, C-stocks, and physical chemical conditions experience in slow growth. Mangrove forest in Jakarta Bay beach has experienced in succession and natural selection so the dominance species has overdue such as Avicennia marina, A.Lanata, Rhizophora aviculata, R.Mucronata, Soneratia caseolaris, S.Alba. Average of important value index (IVI) was low, in tree level 113,57%, sapling level 92,93%, seedling level 80,60%. The low of IVI caused the low of C-stocks 10,214 t.C/ha (positif relationship).

The result of modeling showed leverage of this problem are water river discharge (207,775 m³/s) and ocean current 0,04 m/s. This two parameters caused significant changed on other parameters such as salinity, disolved oxygen, heavy metal, and brightness which had influencing of growth and presence (frequency) of species. The higher of water river discharge and the less of ocean current made the slowest growth of mangroves. This made sense to repairing of mangrove forest management in disturbing area to focus on the leverage so would be efective and effisience. Hope this research result would be part of problem solving  in mangrove forest which had led in disturbing area."

"Penelitian komunitas ikan yang tertangkap dengan jaring push net dan kaitannya dengan produksi serasah hutan mangrove di Pulau Panjang, Teluk Banten telah dilakukan pada bulan Oktober?Desember 2014 saat pasang purnama. Tujuan penelitian untuk melihat keanekaragaman dan komunitas ikan serta mengetahui besarnya serasah yang dilepas ke perairan laut dan hubungan antara C, N, P serasah dengan C, N, P Chandidae (famili ikan dominan dalam penelitian). Metode penangkapan ikan dengan push net secara manual dan pemasangan perangkap serasah berupa paralon yang mengarah ke perairan laut di Stasiun 1 dan 2. Hasil tangkapan ikan yaitu 1.770 individu (14 famili, 16 marga, dan 22 spesies). Jumlah terbanyak di Stasiun 1 (1.213) dan bulan November (749). Nilai H? di Stasiun 1 (0,71) dan 2 (0,81) adalah rendah dan sedang, didukung rendahnya nilai E dan tingginya D. Sebanyak 51% ikan yang tertangkap adalah Ambassis gymnocephalus dari famili Chandidae. Ikan komersial yang tertangkap yaitu dari famili Mugilidae dan Serranidae. Mayoritas ikan yang tertangkap juga merupakan ikan penetap sejati (true resident) yaitu berjumlah 1.248 ekor. Biomassa serasah dan Chandidae terbesar yaitu di bulan Desember (219,49 g dan 75,85 g). Sementara Stasiun 1 memberikan biomassa terbesar untuk serasah (162,99 g) dan Stasiun 2 untuk Chandidae (19,14 g). Nilai serasah terbanyak yang dilepas ke laut yaitu pada bulan Desember di Stasiun 1 (47,47 g/m³/s). Nilai koefisien relasi C, N, P serasah dengan C, N, P Chandidae memberikan hasil yang sama yaitu 0,999. Model regresi yang terbentuk berturutturut yaitu Chandidae = 0,889 C Serasah, Chandidae = 11,367 N Serasah, dan Chandidae = 5,407 P Serasah.

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The research of fish community and its correlation with the production of mangrove forest litter in Panjang Island, Banten Bay had been conducted from October to December 2014 while spring tide. The research?s aim was to know the fish diversity and fish community, to identify mangrove litter?s value to the sea and correlation between C, N, P of mangrove litter and C, N, P of Chandidae (the biggest fish family captured). The method was used push net manually active and also water pipes were put to captured mangrove?s litter to the sea at Station 1 and 2. In total, 1770 species were captured (14 families, 16 genera, and 22 species), the most large number were at Station 1 and in November (1.213 and 749 individus). H? value at Station 1 was low (0,71), meanwhile at Station 2 was moderate (0,81). It supported by low E value. 51% fish captured was Ambassis gymnocephalus from Chandidae family. Economic value fish captured were Mugilidae and Serranidae. Mostly fish captured also were true resident fish (1.248). The biggest biomass of mangrove litter was been at Station 1 (162,99 g), while Chandidae was been at Station 2 (19,14 g). The biggest removed mangrove litter to the sea water was in December and Station 1 (47,47 g/m³/s). The Pearson correlation from C, N, P of mangrove litter and C, N, P of Chandidae gave the same value (0,999). The model of Linear Regression were Chandidae = 0,889 C Mangrove litter, Chandidae = 11,367 N Mangrove litter, dan Chandidae = 5,407 P Mangrove litter."

"Plankton and fish communities of rumpon waters around pramuka Island (Seribu Islands)"

"Copepoda merupakan zooplankton yang dominan di lautan, dan mempunyai peranan penting dalam rantai makanan di ekosistern perairan, termasuk perairan mangrove (estuarine). Penelitian mengenai Copepoda di perairan mangrove Cilacap, Jawa Tengah, telah dilakukan pada bulan Oktober 1997 dan April 1998. Dari hasil identifikasi ditemukan sebanyak 25 jenis yang termasuk dalam 17 marga, 12 suku, dan 4 bangsa (ordo). Calanoida merupakan ordo yang paling besar, dengan jumlah anggota 17 jenis. Frekuensi kehadiran tertinggi ditemukan pada Acartia erythraea dan Pseudodiaptomus incisus, masing-masing 58,34% dan 52,08%. A. erythraea paling melimpah pada bulan April (rata-rata 7,81% dan 10,59%) dengan kepadatan maksimal 102 ind./l.; sedangkan P. incisus paling melimpah pada bulan Oktober (rata-rata 6,56% dan 14,73%) dengan kepadatan maksimal 62 ind./l.Keanekaragaman jenis Calanoida berkisar antara 0,424-0,849, kemerataan individu tiap jenis 0,256-0,429, kekayaan jenis 0,610-2,471, kesamaan jenis antara dua lokasi 0,182-0,933. Hasil analisis kluster pada musim dan waktu pengamatan yang berbeda, tidak terbentuk pengelompokan. Meskipun demikian terdapat kecenderungan pada St. 1, 2, dan 3 membentuk kelompok yang terpisah dari St. 4. Penyebaran dan kelimpahan Copepoda sangat dipengaruhi oleh salinitas. Kisaran salinitas pada bulan Oktober 18,1-31,7 %0 dan 9,2-29,1 %0 pada bulan April. Selain salinitas, pengaruh musim juga turut menentukan komposisi jenis dan kelimpahan Copepoda.

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Copepods is a dominant group of marine zooplankton, and has an important role in the marine food chain. Copepods lives in various habitats, in freshwater, estuarine, and marine. Information on copepods in Indonesia mostly came from expedition reports on East Indonesian waters. Nevertheless, information concerning copepods in mangrove waters (estuarine) is very limited. The Cilacap mangrove waters has a unique ecosystem. It has high estuarine biodiversity lives, in which of them is copepods. From this fact, a study on the taxonomy and community structure of copepods in Cilacap mangrove waters was conducted on October 1997 and April 1998.The aims of study is to know the diversity and fluctuation of copepods species, the relationship community structure of copepods with the environmental factors in Cilacap mangrove waters, to available information on description and illustration of copepods that area from two seasons.Twenty-five species belonging to 12 families was recorded. They include 17 species of Calanoida, three species of Poecilostomatoida, four species of Cyclopoida, and one species of Harpacticoida. Two species showed high frequency of occurrence and abundance, i.e. Pseudadiaptonius incises at dry season, and Acartia erytlhraea at wet season. This indicated that the two species were common and distributed more widely than others.The highest diversity and richness indices of copepods species were found in Sapuregel (St. 3) at two seasons, and Teluk Penyu had highest evenness index at dry season. Donan mouth river and Sapuregel had the highest similarity index at dry season. Cluster analysis resulted in one group at all study on October 1997 and April 1998. Stations 1, 2, and 3 had the highest relationship than station 4. The water conditions of Cilacap mangrove waters showed that salinity ranged from 9,2-31,7 %0 temperature ranged from 25-32°C, pH ranged from 6,58-8,74, turbidity ranged from 0-7 NTU, DHL ranged from 10,4-44,7 mg/l, and DO ranged from 4,40-8,52 mg/l."

"Tingkat curah hujan menyebabkan fluktuasi faktor abiotik dalam ekosistem mangrove yang berdampak terhadap ekosistem mangrove. Kualitas ekosistem mangrove memengaruhi struktur komunitas Gastropoda, terutama di Pulau Rambut pada tahun 2022 dan 2023. Penelitian bertujuan untuk menganalisis struktur komunitas Gastropoda (kepadatan, keanekaragaman, kemerataan, dominansi, dispersi, dan kesamaan jenis) dan faktor abiotik di Pulau Rambut. Penelitian ini memiliki tujuan lain, yaitu menganalisis perbandingan struktur komunitas Gastropoda di Pulau Rambut pada tahun 2022 dan 2023 akibat musim hujan. Pengambilan sampel dilakukan menggunakan line transect dengan kuadrat dalam empat stasiun yang diikuti pengukuran parameter lingkungan (suhu udara, salinitas air, dan pH tanah). Sampel Gastropoda diketahui melalui identifikasi dan dianalisis menggunakan kepadatan, indeks keanekaragaman Shannon-Wiener, indeks kemerataan, indeks dominansi Simpson, indeks dispersi, dan indeks kesamaan Jaccard. Hasil penelitian ini didapatkan hanya tiga jenis Gastropoda dari famili Potamididae (Terebralia sulcata, Terebralia palustris, dan Telescopium telescopium) di Pulau Rambut pada tahun 2022 dan 2023. Kepadatan Gastropoda didapatkan sebesar 24,9 ind/m2 dan 16,6 ind/m2. Indeks keanekaragaman jenis Gastropoda diperoleh sebesar 0,800 dan 0,765 yang tergolong rendah. Indeks kemerataan jenis Gastropoda didapatkan sebesar 0,728 dan 0,696 yang tergolong kemerataan merata. Tingkat dominansi diketahui terdapat spesies yang mendominansi. Pola persebaran di Pulau Rambut menunjukkan pola persebaran mengelompok dan seragam. Indeks kesamaan Jaccard menunjukkan semua stasiun mempunyai kesamaan komposisi jenis pada tahun 2022, sedangkan indeks kesamaan Jacaard pada tahun 2023 menunjukkan stasiun Barat mempunyai komposisi jenis yang berbeda. Korelasi kepadatan Gastropoda dan parameter lingkungan pada tahun 2022 dan 2023 menunjukkan tidak terdapat hubungan kecuali suhu pada tahun 2022. Perbandingan kepadatan Gastropoda pada tahun 2022 dan 2023 memperlihatkan tidak adanya perbedaan yang signifikan, sedangkan perbandingan tipe sedimen lumpur pada tahun 2022 dan 2023 menunjukkan adanya perbedaan yang signifikan.

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The level of rainfall causes fluctuations in abiotic factors in the mangrove ecosystem which have an impact in the mangrove ecosystem. The quality of the mangrove ecosystem affects the structure of the Gastropods community, especially at the Pulau Rambut in 2022 and 2023. The research aimed to analyze the structure of the Gastropods community (density, diversity, evenness, dominance, dispersion, and species similarity) and abiotic factors in Rambut Island. This research had another objective, which analyzed a comparison of the Gastropods community structure on Rambut Island in 2022 and 2023 due to the rainy season. Sampling was carried out using a line transect with quadrate in four stations followed by measurements of environmental parameters (air temperature, water salinity, and soil pH). Gastropods samples were identified through identification and analysis using density, Shannon-Wiener diversity index, evenness index, Simpson dominance index, dispersion index, and Jaccard similarity index. The results showed three types of Gastropods from Potamididae family (Terebralia sulcata, Terebralia palustris, and Telescopium telescopium) on Rambut Island in 2022 and 2023. Gastropods densities were 24.9 ind/m2 and 16.6 ind/m2. Gastropods species diversity index was obtained at 0.800 and 0.765 which were classified as low. Gastropods species evenness index was found to be 0.728 and 0.696 which were classified as even. The level of dominance was known to have a dominant species. The distribution pattern on Pulau Rambut showed a clustered and uniform distribution pattern. The Jaccard similarity index in 2022 showed that all stations had same species composition but the Jaccard similarity index in 2023 showed that the West stations had difference species composition. Correlation between Gastropods density and environmental parameters in 2022 dan 2023 showed no relationship except for temperature in 2022. Gastropods density comparison in 2022 and 2023 showed no significant difference, while mud sediment type comparison in 2022 and 2023 showed a significant difference."