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"Penelitian mengenai hubungan struktur terhadap parameter fisika dan kimia di Situ Puspa, Universitas Indonesia, Depok, Jawa Barat telah dilakukan pada bulan April hingga Juni 2022. Penelitian ini bertujuan untuk mengetahui hubungan kelimpahan fitoplankton terhadap parameter fisika dan kimia di Situ Puspa UI. Sampel yang digunakan dalam penelitian ini adalah fitoplankton dari perairan Situ Puspa UI. Hasil penelitian menunjukkan bahwa jenis fitoplankton di Situ Puspa UI ditemukan 24 marga dari 9 kelas dan kelimpahannya berkisar 121-4.167 plankter/liter. Fitoplankton yang hidup di Situ Puspa UI memiliki produktivitas, ekosistem, kestabilan, dan keanekaragaman fitoplankton sedang, tidak ada jenis yang mendominasi, kemerataan cukup dan hampir merata, dan Situ Puspa mengalami pencemaran sedang. Kelimpahan fitoplankton pada bagian inlet berkorelasi positif dengan oksigen terlarut, kecepatan arus, dan fosfat. Kelimpahan fitoplankton pada bagian midlet berkorelasi positif dengan nitrat dan pH serta kelimpahan fitoplankton pada bagian outlet berkorelasi positif dengan suhu, turbiditas, dan kedalaman air.

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Research on the relationship of structure to physical and chemical parameters at Situ Puspa, Universitas Indonesia, Depok, West Java was carried out from April to June 2022. This study aimed to determine the relationship between abundance of phytoplankton while physical and chemical parameters at Situ Puspa UI. The sample used in this study was phytoplankton from the waters of Situ Puspa UI. The results showed that the types of phytoplankton in Situ Puspa UI found 24 genera from 9 classes and their abundance ranged from 121-4,167 plankter/liter. Phytoplankton that lived in Situ Puspa UI has moderate productivity, ecosystem, stability, and phytoplankton diversity, no species dominates, evenness were sufficient and almost evenly distributed, and Situ Puspa UI was moderately polluted. The abundance of phytoplankton at the inlet were positively correlated with dissolved oxygen, current velocity, and phosphate. The abundance of phytoplankton in the midlet were positively correlated with nitrate and pH and the abundance of phytoplankton at the outlet were positively correlated with temperature, turbidity, and water depth."

"Penelitian mengenai struktur komunitas meiofauna di substrat padang lamun Pulau Pari, Kepulauan Seribu telah dilakukan pada bulan November tahun 2011. Penelitian bertujuan untuk mengetahui hubungan antara struktur komunitas meiofauna interstisial dengan substrat padang lamun yang berbeda. Sampel diambil secara purposive random sampling pada 2 stasiun, 15 titik di padang lamun bagian utara dan barat daya Pulau Pari. Berdasarkan hasil penelitian diperoleh 8 takson yang berasal 6 filum yakni Nemathelminthes, Annelida, Platyhelminthes, Arthropoda, Protozoa dan Gnathostomulida. Kelimpahan jenis meiofauna interstisial berkisar antara 109.000 -- 194.000 individu / m2. Kelimpahan tertinggi dimiliki oleh kelompok Nematoda jenis Daptonema sp. sedangkan terendah ada pada kelompok Foraminifera. Komposisi butiran sedimen memengaruhi komposisi kehadiran jenis meiofauna yang hidup di antara rongga interstisialnya. Berdasarkan data parameter abiotiknya, padang lamun Pulau Pari memiliki kondisi lingkungan yang sesuai untuk kehidupan meiofauna.

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Research on the community structure of the interstitial meiofauna in substrate of seagrass bed in Pari Island was conducted on November 2011. The objective of this study was to determine the relationship between interstitial meiofauna community structure and the different substrate of different sea grass community. Samples were taken by purposive random sampling methods in 2 stations, 15 sites in north side and south west side seagrass bed in Pari Island. The identification on the interstitial meiofauna obtained 8 taxons from 6 phyla, they are Nemathelminthes, Annelida, Platyhelminthes, Arthropoda, Protozoa and Gnathostomulida. The abundance of the interstitial meiofauna was between 109.000 - 194.000 individual/m2. The highest abundance belonged to the group of nematode class Daptonema sp. while the lowest belonged to the group of Foraminifera. The grain size composition influences the composition of meiofauna who lived in the interstitial space of its substrates. Based on abiotic parameters data, the waters of Pari Island still have the appropriate environmental condition for the optimal growth of meiofauna."

"Penelitian tentang struktur komunitas hidrofita di Situ Agathis Kampus Universitas Indonesia Depok, Jawa Barat telah dilakukan pada bulan Juni--Juli 2011. Penelitian bertujuan untuk mengetahui struktur komunitas hidrofita yang meliputi keanekaragaman, dominansi, frekuensi, kerapatan, dan nilai penting di Situ Agathis. Analisis vegetasi tumbuhan dilakukan dengan metode purposive random sampling pada daerah inlet, midlet, dan outlet. Sampel tumbuhan yang diperoleh diidentifikasi menggunakan buku identifikasi tumbuhan air. Hasil penelitian menunjukkan terdapat 14 jenis hidrofita di Situ Agathis. Hasil penelitian juga menunjukkan bahwa keanekaragaman jenis hidrofita di Situ Agathis tergolong ?sedang? dan penyebaran jenis cukup merata; akan tetapi kesamaan jenis ?kurang sama? antara daerah inlet, midlet, dan outlet perairan. Jenis Eichhornia crassipes merupakan tumbuhan yang mendominasi dan memiliki nilai penting tertinggi di perairan Situ Agathis.

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A research regarding the community structure of hydrophyte in Lake Agathis at the University of Indonesia (UI) Campus Depok, West Java, has been conducted from June--July 2011. The research was aim to understand the community structure of hydrophyte, which include biodiversity, dominance, frequency, density, and importance values in Lake Agathis. The vegetation analysis for all area of study were done using the purposive random sampling method. The plant samples that were collected were then identified based on the morphological character using the hydrophyte identification book. Fourteen plant species were found in Lake Agathis. The result shows that the hydrophyte biodiversity in Lake Agathis was in a ?medium- abundant? category, the species dispersal was in an ?evenly enough? category, however the diversity of the inlet, midlet, and outlet area were ?dissimilar?. Eicchornia crassipes was the dominance species which also has the highest importance value in Lake Agathis."

"Penelitian mengenai struktur komunitas plankton di Sungai Pesanggrahan dari bagian hulu (Bogor, Jawa Barat) hingga bagian hilir (Kembangan, DKI Jakarta) telah dilakukan pada bulan Oktober 2011. Penelitian bertujuan untuk mengetahui struktur komunitas plankton serta hubungannya dengan parameter fisika-kimia air. Hasil identifikasi dan perhitungan sampel plankton ditemukan 57 marga fitoplankton dari 5 kelas, yaitu Chlorophyceae, Bacillariophyceae, Cyanophyceae, Euglenaphyceae dan Dinophyceae. 9 marga zooplankton dari 3 filum, yaitu Ciliophora, Arthropoda dan Rotifera juga ditemukan pada sampel plankton. Fitoplankton dari marga Navicula, Oscillatoria dan Planktothrix mendominasi di sepanjang aliran Sungai Pesanggrahan, sedangkan dari kelompok zooplankton didominasi oleh marga Cyclops dan Epistylis. Bedasarkan indeks keanekaragaman plankton, tingkat pencemaran di sepanjang aliran Sungai Pesanggrahan dikategorikan pada tingkat pencemaran sedang. Diketahui bahwa parameter kimia perairan, yaitu kandungan nitrat berpengaruh terhadap kepadatan plankton di Sungai Pesanggrahan.

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Research on community structure of plankton in Pesanggrahan River from upstream (Bogor, West Java) to downstream (Kembangan, DKI Jakarta), has been carried out in Oktober 2011. The study aims to determine the structure of plankton communities and its relationship with physico-chemical parameters of water. Identification and calculation of plankton samples showed 57 genera of phytoplankton from 5 classes; Chlorophyceae, Bacillariophyceae, Cyanophyceae, Euglenaphyceae and Dinophyceae. 9 genera of zooplankton from 3 phylum; Ciliophora, Arthropods and Rotifers, were also found in the plankton samples. Phytoplankton from genus Navicula, Oscillatoria and Planktothrix were dominating along the Pesanggrahan River, while from the zooplankton were dominated by genus Cyclops and Epistylis. Based on diversity index of plankton, level pollution along Pesanggrahan River was in moderate level of pollution. It was showed that chemical parameters of water, which is nitrat content was affecting the density of plankton in Pesanggrahan River."