Contrasting effects of singlet oxygen and hydrogen peroxide on bacterial community composition in a humic lake.

ABSTRACT: Light excitation of humic matter generates reactive oxygen species (ROS) in surface waters of aquatic ecosystems. Abundant ROS generated in humic matter rich lakes include singlet oxygen ((1)O2) and hydrogen peroxide (H2O2). Because these ROS differ in half-life time and toxicity, we compared their effects on microbial activity ((14)C-Leucine incorporation) and bacterial community composition (BCC) in surface waters of humic Lake Grosse Fuchskuhle (North-eastern Germany). For this purpose, experiments with water samples collected from the lake were conducted in July 2006, September 2008 and August 2009. Artificially increased (1)O2 and H2O2 concentrations inhibited microbial activity in water samples to a similar extent, but the effect of the respective ROS on BCC varied strongly. BCC anal

SUBMITTER: Glaeser SP 

PROVIDER: S-EPMC3965437 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature