| Dr. Jan Karlsson is a professor in the Department of Ecology and Environmental Sciences at Umeå University, Sweden.
His research is mostly on low-nutrient aquatic ecosystems with a special focus on climate impacts on carbon and energy flow in alpine
and subarctic lakes. His research questions include what controls the production of biomass from the bottom of aquatic food webs (bacteria
and algae), via intermediate consumers (benthic invertebrates and zooplankton) to top predators (fish), and the influence of dissolved
organic matter on biological productivity; e.g., Karlsson et al. 2009. Light limitation of nutrient-poor lake ecosystems Nature 460:
506-509. Another aspect of his research focuses on what controls the production of greenhouse gases in aquatic ecosystems,
including the effects of land use and climate; e.g., Karlsson et al. 2013. High emission of carbon dioxide and methane during
ice thaw in high latitude lakes. Geophysical Research Letters 40: 1123-1127.