The effects of increased PAR and UV on the xanthophyl cycle of Antarctic ice algae

Sea ice algae in Antarctica live on the bottom of sea ice often at low irradiances. During sea ice break up, they become exposed to high levels of irradiance.

This cycle was investigated in Antarctic sea ice to determine, a) how does the xanthophyll cycle respond to changes in irradiance, b) What is the relationship between the xanthophyll cycle and UV radiation, c) What is the relationship between xanthophyll cycle and the water column light profile? Sea ice algae was collected from Cape Royds and used for experiments in the laboratory. PAR sensors were placed under the ice to measure ambient PAR and UV radiation, algae samples were placed in beakers and covered with plastics of different UV transmissions and others were placed in a series of containers with different neutral density filters.