Identifikasi dan Isolasi Mikroalga dari Perairan Rawa Gambut di Kelurahan Air Hitam Kota Pekanbaru Provinsi Riau

Abstract

Microalgae are aquatic organisms that are able to adapt to various environmental conditions, including the low pH water in the peat ecosystem. To determine the types of microalgae, present in the peat area, a study has been conducted from August to November 2021. The microalgae samples were taken from peat swamp in the Air Hitam Village, Pekanbaru, using a plankton net no 25. One hundred liters of water sample was filtered using the plankton net into 150 ml of water sample.  The microalgae present were then identified and three of the most common species were isolated and cultured.  The microalgae were identified using a binocular microscope. Results shown that there were 14 types of microalgae present, they were belonged to three classes. They were   Chlorophyceae (Chlorella sp, Haematococcus pluvialis, Desmodesmus denticulatus, Scenedesmus dimorphus, Westella botryoides, Desmodesmus abundans, Coelastrum microporum, Scenedesmus serratus, Pediastrum duplex), Zygnematophyceae (Closterium moniliferum, Spirogyra condensata, Bambusina brebissonii, Closterium ehrenbergii), and Cyanophyceae (Mycrocystis sp). The abundance of microalgae ranged from 64 – 13,696 cells/L, and it can be classified as oligotrophic. The most common were Haematococcus pluvialis, Chlorella sp and Scenedesmus dimorphus. These microalgae were then cultured for 15 days on a laboratory scale. The peak of microalgae growth was on day 8 and the population of Haematococcus sp was 183,398 cells/L, Scenedesmus dimorphus was 223,341 cells/L and Chlorella sp was 281,563 cells/L. The maximum organic weight was on day seven of Haematococcus sp was 0.80 gr, Scenedesmus dimorphus was 0.82 gr and Chlorella sp was 0.75 gr.