IDENTIFIKASI FITOPLANKTON SPESIES HARMFULL ALGAE BLOOM (HAB) SAAT KONDISI PASANG DI PERAIRAN PESISIR BRONDONG, LAMONGAN, JAWA TIMUR

Arianto Choirun, Syarifah Hikmah Julinda Sari, Feni Iranawati

Abstract


The objectives of this study was to identify composition and community structure of phytoplankton HAB during
tide period in Brondong Coastal Waters, Lamongan, East Java. The research was conducted in 7 April, 22 April
and 6 May 2015. There were five stations along Brondong coastal. Phytoplankton sampling was carried out in
each stations by using plankton net with vertical method. This study also was held to correlate between
abundance and community structure index of phytoplankton found in studied areas with water quality by
correlation analysis. Composition of phytoplankton HAB was found namely Dinophyceae (Ceratium fusus,
Ceratium macroceros, Ceratium pulchellum, Dinophysis acuminata, Gonyaulax polygramma, Gonyaulax
triacantha, Noctiluca scintillans and Peridinium claudicans) and Bacillariophyceae (Chaetoceros compressus,
Chaetoceros laciniosus dan Nitzschia closterium). The highest abundance was determined 16550 cell/L which
was belong to Nitzschia closterium. Deversity index was ranged from 0,58-1,44 while similiarity indeks ranged
from 0,66-0,89, and dominance index was 0,29-0,61. The correlation analysis found that there were significant
positive relationship between abundance, diversity and similiarity index with seawater temperature and DO.
Keywords : Phytoplankton, HAB, identification, coastal, tide


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