Journal
MARINE POLLUTION BULLETIN
Volume 196, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2023.115632
Keywords
Dimethylsulfoxide (DMSO); Northern Antarctic Peninsula (NAP); Ice-melt water; Environmental factors; Phytoplankton
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We investigated the spatial distributions of dissolved and particulate dimethylsulfoxide (DMSOd and DMSOp) off the northern Antarctic Peninsula during the austral summer of 2018, an ecologically and climatically important region. Our findings showed that DMSOd was concentrated in the ice-melt zone and had a weak positive correlation with temperature and a negative correlation with nutrients. DMSOp, on the other hand, accumulated in deep waters through bio-debris accumulation and microbial activity.
Spatial distributions of dissolved and particulate dimethylsulfoxide (DMSOd and DMSOp) were investigated off the northern Antarctic Peninsula during the austral summer of 2018, an ecologically and climatically important region of the world. In the upper waters, DMSOd was concentrated in the ice-melt zone because DMSO functions physiologically as an intracellular osmolyte and cryoprotectant. DMSOd concentrations had a weak positive correlation with temperature but a negative correlation with nutrients. This highlighted the importance of temperature-dependent biological activities and photolysis in DMSOd production and the important role of the intracellular antioxidation system in phytoplankton cells. The decrease of average DMSOp:Chl-a ratios in upper waters from west to east, along with decreasing temperatures and increasing diatoms proportions in the phytoplankton, illustrates how seawater DMSO production capacities depend on ambient temperatures and the composition of phytoplankton assemblages. DMSOp were accumulated in deep waters through bio-debris accumulation and microbial activity.
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