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Abstrak :
Harmful Algal Bloom (HAB) incidences in Indonesian waters were increasingly accoured from time to time.Extensive and continous studies in this field are needed to be done in more areas in the country.....

Abstrak :
Mikroalga epiplastik diketahui berpotensi menyebabkan Harmful Algal Bloom (HAB) menjadikan plastik sebagai vektor transportasi mikroalga berbahaya. Masalah penumpukan sampah dilaporkan di Pantai Marina Ancol. Penelitian ini bertujuan untuk menganalisis mikroalga epiplastik pada substrat sampah plastik minumann kemasan jenis Polyethylene Terephthalate (PET) berdasarkan kelimpahan sel dan faktor lingkungan. Penelitian dilakukan dengan mengumpulkan total 9 sampel sampah plastik di ketiga titik sampling, lalu pemisahan mikroalga dengan kombinasi squeeze method & scraping. Sampel air dipisahkan dari substrat, sampah plastik dihitung berat basahnya, sampel disaring dengan saringan bertingkat, dan pengamatan cover glass di bawah mikroskop cahaya. Mikroalga epiplastik yang ditemukan total 15 genera dari kelas Bacillariophyceae, Dinophyceae, dan Cyanophyceae yang berpotensi menyebabkan HAB. Pseudo-nitzschia, Nitzschia, Prorocentrum, Lyngbya, dan Trichodesmium merupakan genus yang berpotensi toksik. Prorocentrum, Blixaea, Tripos, dan Trichodesmium diketahui pernah menyebabkan blooming. Kelimpahan mikroalga tergolong tinggi, yaitu sebesar 321.971 sel/gr berat basah plastik PET dengan Achnanthes sebagai genus yang memperoleh total kelimpahan tertinggi, yaitu 100.850 sel/gr. Hubungan antara kelimpahan dan faktor lingkungan diuji menggunakan korelasi Pearson. Faktor intensitas cahaya dan kecerahan berkorelasi positif. ...... Epiplastic microalgae are known to have the potential to cause Harmful Algal Blooms (HAB) making plastic as a vector for transporting harmful microalgae. The issue of waste accumulation has been reported at Marina Ancol Beach. This study aims to analyze epiplastic microalgae on Polyethylene Terephthalate (PET) plastic waste beverage packaging based on cell abundance and environmental factors. The research was conducted by collecting a total of 9 samples of plastic waste at three sampling points, followed by the separation of microalgae using a combination of the squeeze method and scraping. The water samples were separated from the substrate, the wet weight of the plastic waste was measured, the samples were filtered using a graded sieve, and observation was done under a light microscope using a cover glass. A total of 15 genera of epiplastic microalgae were found from the class Bacillariophyceae, Dinophyceae, and Cyanophyceae, which have the potential to cause HAB. Pseudo-nitzschia, Nitzschia, Prorocentrum, Lyngbya, and Trichodesmium are genera that are potentially toxic. Prorocentrum, Blixaea, Tripos, and Trichodesmium are known to have caused blooming. The abundance of microalgae was 321,971 cells/g wet weight of PET plastic and relatively high with Achnanthes as the genus with the highest total abundance, which is 100,850 cells/g. The relationship between abundance and environmental factors was tested using Pearson correlation. The factors of light intensity and water clarity showed a positive correlation.

Abstrak :
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.

Abstrak :
Ten surface sediment samples were collected from Jakarta bay to study the horizontal distribution of dinoflagellate resting cysts in this area.Overall results had shown unique species composition and diversity of dinoflagellate cyst assemblages....