Increasing CO2 Concentration Impact upon Natural Phytoplankton Community at Spermonde Island, Indonesia: Mesocosm Study  

Nita Rukminasari1 , Muhammad Lukman1 ,  Sahabuddin2
1. Marine Science and Fisheries Faculty, Hasanuddin University, Indonesia
2. Research Institution for Coastal Aquaculture, Maros, Indonesia
Author    Correspondence author
International Journal of Marine Science, 2014, Vol. 4, No. 18   doi: 10.5376/ijms.2014.04.00018
Received: 08 Dec., 2013    Accepted: 20 Jan., 2014    Published: 24 Feb., 2014
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Rukminasari et al., 2014, Increasing CO<sub>2</sub> Concentration Impact upon Natural Phytoplankton Community at Spermonde Island, Indonesia: Mesocosm Study, International Journal of Marine Science, Vol.4, No.18: 166-178 (doi: 10.5376/ijms.2014.04.0018)

Ocean acidification is one of an environment problem due to increasing CO2 concentration. Ocean acidification have shown a negatively impact to marine organisms especially calcifying organisms such as microalgae, coral reef and other invertebrate organisms. Decreasing in carbonate saturation state on the calcification rates of individual species and communities in both planktonic and benthic habitats were occurred due to seawater acidification.
The study was conducted at three locations: Barru, Takalar and Barrang Lompo Island using mesocosm technique with two different of incubation periods (48 and 96 hours). Six pCO2 level based on adding acid base treatments were used, which were 280, 380, 550, 650, 750 and 1000 ppm with 4 replicates


In general, alkalinity decreased with increasing CO2 concentration. However, length of incubation was showed no significant affected to DIC for all CO2 concentration at Barru and Barrang Lompo mesocosm experiment. PIC and POC showed a varied response between all locations of mesocosms experiment. There was a trend where increasing of POC with increasing of CO2 concentration. PIC concentration at Barru and Takalar showed a slightl higher at 96 hours than 48 hours of incubation period and for Barrang Lompo mesocosm experiment PIC was higher at 48 hours than 96 hours of incubation period. Chlorophyll a and cell abundance was decresing with increasing CO2 concentration. Growth, photosynthesis and calcification rate decreased with increasing CO2 concentration.
Ocean acidification; Calcifying microalgae; Calcification rate; Natural phytoplankton community; Mesocosm study; Spermonde Islands
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