Distributions of Nutrients in Relation to Phytoplankton Community Heterogeneity in the Makassar Strait, Indonesia

Abstract The Monitoring of Indonesia Throughflow (MITF) with scientific cruise across the Indonesian waters that are connecting islands Kalimantan and Sulawesi or strait Makassar. This carried out in August 2015 an area between 2° 4° South 118° 119° East. aims to characterize concentration nutrients abundance phytoplankton groups as well explain their distribution based on environmental conditions. Nutrient concentrations consisting Inorganic Dissolved Nitrogen (DIN), Phosphate (DIP) Silicate (DSi) were measured at seven depth layers, i.e. 10, 30-60, 100-150, 300, 500, 750 1000 meters. study showed transitional season (August), upper layer sites characterized by salinity 34.05 34.76 PSU, temperature 26.85 29.88 °C, relatively high nutrient concentration, DIN = 8.91 - 36.74 μM, DIP 0.02 0.16 DSi= 31.88 249.49 μM. community found Cyanophyta, Bacillariophyta (Diatom), Dinophyta, where highest was Cynophyta for genus Trichodesmium sp. composition surface is strongly influenced sea temperature, concentration. We utilization high.