Abstract:
The aim of this study is to understand the relationship between nitrate and
phosphate content phytoplankton abundance in the Paki lake, Kampar Kiri Hilir Subregency,
Kampar Regency, Riau. This research was conducted on November to
December 2007. Method used in this research was a survey method. There were four
stations, and in each station, sampling were conducted 3 times, once a week. Sample
was analyzed in the Aquatic Ecology Laboratory of Fisheries and Marine Science
Faculty, Riau University.
Results shown that the phytoplankton obtained consist of four classes, there
were Cyanophyceae (9 species), Bacillariophyceae (4 species), Chlorophyceae (5
species) and Xanthhophyceae (1 species). Phytoplankton abundance ranged from
48,400 to 63,367 cells/1. Nitrate concentration ranged from 0.441 to 0.633 mg/1, while
phosphate ranged from 0.0581 to 0.0763 mg/1. As the ratio of nitrate and phosphate
content was 8.21:1, it indicates that nitrate and phosphate concentration was in the
normal level. Results of regression analysis shown that Fratio 11 776 > Ftabie 5.14 and it
means that the relationship between nitrate-phosphate concentration phytoplankton
abundance is significant.
Keywords: nitrate, phosphate, phytoplankton, danau Paki
