Rapid Manipulation in Irradiance Induces Oxidative Free-Radical Release in a Fast-Ice Algal Community (McMurdo Sound, Antarctica).

ABSTRACT: Sea ice supports a unique assemblage of microorganisms that underpin Antarctic coastal food-webs, but reduced ice thickness coupled with increased snow cover will modify energy flow and could lead to photodamage in ice-associated microalgae. In this study, microsensors were used to examine the influence of rapid shifts in irradiance on extracellular oxidative free radicals produced by sea-ice algae. Bottom-ice algal communities were exposed to one of three levels of incident light for 10 days: low (0.5 μmol photons m^-2 s^-1, 30 cm snow cover), mid-range (5 μmol photons m^-2 s^-1, 10 cm snow), or high light (13 μmol photons m^-2 s^-1, no snow). After 10 days, the snow cover was reversed (either removed or added), resulting in a ra

SUBMITTER: Kennedy F 

PROVIDER: S-EPMC7723870 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature