Open AccessPhytoplankton distribution in Ranggeh River and its relationship with physicochemical parameters
Author(s) -
Fachmijany Sulawesty,
Yustiawati,
Muhamad Suhaemi Syawal
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/535/1/012024
Subject(s) - phytoplankton , navicula , diversity index , abundance (ecology) , chlorophyta , zooplankton , environmental science , chlorophyll a , ecology , biology , diatom , algae , nutrient , botany , species richness
Ranggeh River, located in Nagari Batang River - Agam Regency, is one of the natural habitats for native fishes of Lake Maninjau. Phytoplankton is a microorganism that has an important role in the aquatic ecosystem, as a primary producer in the food chain and to provide a food source for the higher organisms such as zooplankton and fish. The existence of phytoplankton in the river is influenced by physical and chemical factors. This study was aimed to reveal the correlation of the phytoplankton abundance and physicochemical parameters in Ranggeh River. The observations were conducted in February, March, and April 2019 at the upstream (SR 1, SR 2 and SR 3) and the downstream areas (SR 4 and SR 5) of Ranggeh River. The parameters observed were phytoplankton abundance and some water quality parameters. The phytoplankton community structure was analyzed by the ecological index. The highest and lowest abundance of phytoplankton was found in SR 4 and SR 1, respectively. Bacillaryophyta has been recorded as the most dominant group (98.30% to the total phytoplankton population), followed by Chlorophyta (1.40%), Cyanophyta (0.27%), and Euglenophyta (0.04%). Based on the ecological index, the phytoplankton communities at SR2, SR 3, SR 4 and SR 5 are unstable, and there is a species that dominates namely the Navicula elegans , Navicula pupula and Synedra ulna from the Bacillaryophyta group. According to values of phytoplankton abundance, total nitrogen, total phosphorus, chlorophyll-a, and diversity index, Ranggeh River was mesotrophic water.