The effect of seawater pCO2 concentration of 280, 380, 550, 650, 750 and 1000 ppm on the changing of phytoplankton assemblage was determined through a mesocosm experiment at the Barrang Lompo Island. The experiment was run for 48 and 96 hours without nutrient enrichment. The aim of the study is to examine the effect of the increasing CO2 concentration on the changing phytoplankton assemblages. The result showed that Bacillariophyceae has been the most important algal group accounting for 74.5% for 48 hours of incubation period. Moreover, Diatomaceae was the most dominant algal group for 96 hours of the incubation period, accounting for 50.9%. There was no clear trend of Shannon diversity (H’) and the evenness values between CO2 concentration and incubation period. There was a clear grouping of species assemblages between the incubation periods. ANOSIM result showed that there is no significant difference in species assemblage among CO2 treatments. On the other hand, a significant difference in species assemblage between incubation periods between CO2 concentration treatments was observed. The three taxa that are most responsible for the dissimilarity were Rhizosolenia fragilissima (10.1%), Gyrosigma acuminatum (9.3%), and Biddulphia sinensis (9.2%).
Rukminasari N., Sahabuddin S. & Lukman M., 2018. Do increasing CO2 concentration impacted on changing phytoplankton assemblages? AACL Bioflux 11(1): 91-100. Article.
