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http://dx.doi.org/10.7837/kosomes.2022.28.5.712

UV Effects on Production and Photoreactivity of Chromophoric Dissolved Organic Matter in Media of Polar Marine Phytoplanktons  

Park, Mi Ok (Department of Oceanography, Pukyong National University)
Ha, Sun-Yong (Korea Polar Research Institute)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.28, no.5, 2022 , pp. 712-720 More about this Journal
Abstract
In this study, we evaluated the production and photoreactivity of CDOM of two polar phytoplanktons - Phaeocystis antarctica and Phaeocystis pouchetii, in order to find out UV effects on phytoplanktons. In visible region, CDOM in media of both phytoplanktons under UV-R decreased during 48hrs incubation period. However, in UV region CDOM decreased 30 % in the media of P. antarctica, but increased 10% in media of P. pouchetii, compared to CDOM concentrations of control after 48 hr incubation. This result indicates that biota in polar environment would not well protected from UV-R harmful effect when P. antarctica is dominant because of loss of CDOM, but when P. pouchetii is dominant species, production of UV absorbing organic matter could play more efficiently for UV screening for marine biota. Also we confirmed that FDOM of humic substance (C-peak) produced by these phtoplanktons under UV-R stress were well matched with fluorescence characteristics of the UV-protecting compound, MAAs. This finding shows that Phaeocystis pouchetti with low photoreactivity would contribute to DOM pool of polar marine environment under stratification by global warming.
Keywords
Chromophoric dissolved organic matter (CDOM); Polar marine phytoplankton; UV-incubation experiment; Photoreactivity; Phaeocystis antarctica; Phaeocystis pouchetii;
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