CO2 fixation by seaweeds and their role in De-acidifying Ocean - An experimental approac

Amalu, A M

Kaladharan, P

Revathy, S

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i HlSLNG SEAS IN impacts of sea-level rise ire predicted to increase es, Cliniale refuges are C02FIXA?'ION BY SEAWEEDS AND THEIR ROLE IN UE-ACIDIFYING OCEAN- AN EXPERIMENTAL, APPROACH A. M. AMAILJ', S. REVATHY' AND P. KALADHARAN Central Marine Fisheries Research Institute, Kochi  erala la University of Fisl~eries and Oceali Studies, Panangad, Kochi email : ainalumadhavan8@g1~~ailm. .4bstract (11 marine ecosystems, seaweeds form one of the nmior primary prod~icers due to its crucial role in the sustenance of the food web and ecosystem balance. CO, exerts profound - risl<s with poor adaptive I influence on productivity and growth patterns of seaweeds by for~ning a vital constituent in the --.- ive 50 kni range of coasts of inundation with SLR. ,655,000 were displaced . . are not a crisis of future ,act of SLR, It's a time to e in SL,K adaptation and egies to prepare for the : the forced migration. It 3 take this agenda on to e Refugees, Adoption, photosynthetic process. Present rise in atlnospheric C'O: concentration and its subsequent dissolutioll resulting in a notable drop in the ocean pH leading to ocean acidification is considered as a potential tlueat to the proper functioning and sustailiability ofthe nlarine ecosystelns. ICccping in view of this, an attempt was made to evaluate the potential of 12 seaweed species belonging to classes: Cliloropliyceae, Phaeophyceae and Rhodophyceae to reduce ocean acidification through their primary productivity Each seaweed species were incubated separately in seawater with dissolved CO? levels 0, 50, 100 and l50ppm respectively and their primary productivity was measured using light and dark bottle incubation for a time period of 2 hours. It was observed that all the seaweed species exhibited significant variation (p=<0.05) in their productivity at treatnlents wit11 different CO, concentrations. The productivity of all seaweeds increased at 50 ppm of C 0 2  co~npared to the incubation in thc de-carbonated (0 ppm) waters. Species such as G'rucilaria corticata, Padivla tetrustromnfica, Grafiloupiu lifhophila, Cauler.apa recemosu and Gelidiun? ptisillum exhibited an increase in productivity at 1OOppili of CO? colnpared to 50ppnz of COz concentration and de-carbonated waters. However seaweeds like Chaetomorpl?a antennirza, Ulva flexuosa, Sargassum luightii, Jbloniopsis paclq,rzen?a, Kappayl~ctrs alvarezii and Jaina ~#uben,s showed less productivity at lOOpp~n CO,. All seaweed species had seduced productivity at 15Oppm CO, concentration. A significant variation (p=<0.05) in the pH was also noticed at different CO, treatments. A reduction of0.89, 1.3 1 ,  1.60 units in pH was observed at seawater of 50,100,150 ppm of CO, concentration respectively. Thc study hcncc strongly recommends the prolnotion of large scale mariculture of seaweeds as a strategy for mitigating the impacts of ocean acidification in response to climate changes in marine ecosystelns, while the harvest can support livelihood of coastal fislzers. Keywords: Seaweeds, Carbon sequestration, Ocean acidification, Primary productivity, CO? Seaweed mariculture. TNJFU, FC&RI, Thoothukudi, 19-20 June 2018 m 

CO2 fixation by seaweeds and their role in De-acidifying Ocean - An experimental approach

http://eprints.cmfri.org.in/12916/1/National%20Seminar%20on%20Conservation%20and%20Sustainability%20of%20Aquatic%20Resources_CSAR_2018_Kaladharan%20P.pdf

CO2 fixation by seaweeds and their role in De-acidifying Ocean - An experimental approach

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