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δ13C Measurements as Indicators of Carbon Flow in Marine and Freshwater Ecosystems
Stable isotope ratios provide clues about the origins and transformations of organic matter. A few key reactions control the isotopic composition of most organic matter. Isotopic variations… Expand
Use of monodispersed, fluorescently labeled bacteria to estimate in situ protozoan bacterivory.
We have developed a procedure for preparing monodispersed, fluorescently labeled bacteria (FLB), which may be used to measure virtually instantaneous rates of protozoan bacterivory in natural waters.… Expand
Temporal and spatial variation in stocks of autotrophic and heterotrophic microbes in the upper water column of the central Arctic Ocean
Abstract As part of the SHEBA/JOIS drift experiment, we continually analysed abundance and biomass of autotrophic and heterotrophic microbes in the upper 120 m of the water column of the ice-covered… Expand
Significance of predation by protists in aquatic microbial food webs
Predation in aquatic microbial food webs is dominated by phagotrophic protists, yet these microorganisms are still understudied compared to bacteria and phytoplankton. In pelagic ecosystems,… Expand
Size-selective grazing on bacteria by natural assemblages of estuarine flagellates and ciliates.
The small average cell size of in situ bacterioplankton, relative to cultured cells, has been suggested to be at least partly a result of selection of larger-sized cells by bacterivorous protozoa. In… Expand
High bacterial production, uptake and concentrations of dissolved organic matter in the Central Arctic Ocean
Recent studies have indicated that biological activity is higher in the central Arctic Ocean than once thought. To assess the contribution of heterotrophic processes, we examined bacterial production… Expand
Heterotrophic protists in the Central Arctic Ocean
Distribution, general composition and activity of heterotrophic protists, as well as the distribution of bacteria, were assessed in the upper water column of the central Arctic Ocean during the… Expand
Bacterivory and herbivory: Key roles of phagotrophic protists in pelagic food webs
Research on “microbial loop” organisms, heterotrophic bacteria and phagotrophic protists, has been stimulated in large measure by Pomeroy's seminal paper published in BioScience in 1974. We now know… Expand
Heterotrophic dinoflagellates: a significant component of microzooplankton biomass and major grazers of diatoms in the sea
This review summarizes evidence that heterotrophic (non-pigmented, phagotrophic) dinoflagellates are often a significant component of the biomass of phagotrophic protists in the microplankton size… Expand
Estimating abundunce and single-cell characteristics of respiring bacteria via the redox dye CTC
The redox dye 5-cyano-2,3-ditolyl tetrazolium chloride (CTC) is used in aquatic sciences as a vital stain for enumeration of respiring bacteria in situ. Questions concerning its efficacy have been… Expand