The vertical structuring of methanotrophic communities and its genetic controllers remain
understudied in the water columns of oxygen-stratified lakes. Therefore, we used 16S rRNA …

Although microbes mediate much of the biogeochemical cycling in freshwater, the
categories of carbon and nutrients currently used in models of freshwater biogeochemical …

Small oxygen-stratified humic lakes of the boreal zone are important sources of methane to
the atmosphere. Although stable isotope profiling has indicated that a substantial part of …

Lakes are important habitats for biogeochemical cycling of carbon. The organization and
structure of aquatic communities influences the biogeochemical interactions between lakes …

Aquatic environments with high levels of dissolved ferrous iron and low levels of sulfate
serve as an important systems for exploring biogeochemical processes relevant to the early …

The prevailing view that many humic lakes are net heterotrophic is commonly based on
pelagic measurements alone. Poor light conditions in humic lakes are assumed to constrain …

Life originated in Archaean oceans, almost 4 billion years ago, in the absence of oxygen
and the presence of high dissolved iron concentrations. Early Earth oxidation is marked …

We measured the total mercury (THg) concentration in the muscle of northern pike (Esox
lucius L.) from 12 boreal headwater lakes once per decade during the 1980s to 2010s …

High dissolved organic carbon and low pH are often associated with elevated mercury
content of fish in boreal lakes, but less is known about the fish mercury dynamics in lakes …

Climate change scenarios anticipate decreased spring snow cover in boreal and subarctic
regions. Forest lakes are abundant in these regions and substantial contributors of methane …