Abstract
Abstract
Lake Tempe in South Sulawesi is one of the floodplain lakes in Indonesia that has a unique phytoplankton characteristic. This study aims to see the abundance of phytoplankton and their relationship with physico-chemical parameters in Lake Tempe. Observations were conducted in March and May 2017 in six zones of the lake, consist of 5 zones are non-permanent areas and 1 zone are permanent area. Dissolved oxygen, pH, temperature, turbidity, total dissolved solids, transparency, chlorophyll-a, total nitrogen, and total phosphorus were measured to determine the water quality. Phytoplankton abundance was calculated using the Sedgewick Rafter Method. Phytoplankton community structure was analyzed by Diversity Index, Evenness Index, and Dominance Index. A total of five phyla and 80 species of phytoplankton were found in Lake Tempe, consists of Bacillariophyta, Chlorophyta, Cyanophyta, Dinophyta, and Euglenophyta. The abundance of phytoplankton ranged between 1,133–701,390 individual L−1. Moderate to high diversity (1.751–3.859) and low uniformity (0.069–0,306) among species in the phytoplankton community was found in Lake Tempe. The dominant species was found at two sampling sites (Z.2.1 and Z.2.2), namely Aphanocapsa. The presence of Cyanophyta in Lake Tempe is related to the total phosphorus value.