ABSTRAK
Telah 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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ABSTRACT
Research 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.