The main objectives of this study were to uncover the pathways used for methanogenesis in three different boreal peatland ecosystems and to describe the methanogenic populations involved. The mesotrophic fen had the lowest proportion of CH4 produced from H2-CO2. The oligotrophic fen was the most hydrogenotrophic, followed by the ombrotrophic bog. Each site was characterized by a specific group ...

Citation: Grand MM, Clinton-Bailey GS, Beaton AD, Schaap AM, Johengen TH, Tamburri MN, Connelly DP, Mowlem MC and Achterberg EP (2017) A Lab-On-Chip Phosphate Analyzer for Long-term In Situ Monitoring at Fixed Observatories: Optimization and Performance Evaluation in Estuarine and Oligotrophic Coastal Waters. Front. Mar. Sci. 4:255. doi: 10.3389/fmars.2017.00255 A Lab-On-Chip Phosphate Analyzer...

Citation: Guo C, Xia X, Pitta P, Herut B, Rahav E, Berman-Frank I, Giannakourou A, Tsiola A, Tsagaraki TM and Liu H (2016) Shifts in Microbial Community Structure and Activity in the Ultra-Oligotrophic Eastern Mediterranean Sea Driven by the Deposition of Saharan Dust and European Aerosols. Front. Mar. Sci. 3:170. doi: 10.3389/fmars.2016.00170 Shifts in Microbial Community Structure and Activit...

Isoetid species are small, slow-growing, evergreen water plants with thick, stiff leaves or stems that form basal rosettes and have a proportionally large below ground biomass. Isoetids often dominate carbonate poor (weakly buffered) and nutrient poor (oligotrophic) water and are characterized by a (very) slow growth rate. The special adaptations to oligotrophic conditions enable them to grow w...

Despite its importance to ocean-climate interactions, the metabolic state of the oligotrophic ocean has remained controversial for >15 years. Positions in the debate are that it is either hetero- or autotrophic, which suggests either substantial unaccounted for organic matter inputs, or that all available photosynthesis (P) estimations (including (14)C) are biased. Here we show the existence of...

Lakes in the Alps represent a considerable fraction of nutrient-poor lakes in Central Europe, with unique biodiversity and ecosystem properties. Although some individual lakes are well studied, less knowledge is available on large-scale patterns essential to general understanding of their functioning. Here, we aimed to describe crustacean zooplankton communities (Cladocera, Copepoda) and identi...

Bacterial biomass, potential bacterial production and ectoenzymatic activity were measured at 4 stations along a trophic gradient at the Atlantic Barrier Reef off Belize (Central America). We investigated the changes in the trophic status of this system, which we hypothesized would also lead to changes in the bacterial community. The bacterial community of the oligotrophic station was character...

Enzymatic activities for digestion of proteins and carbohydrates were compared among three organs of the digestive system of Pimelodus maculatus in two reservoirs with different trophic conditions during the winter of 2006. The aim was to test the hypothesis that enzymatic activity for the digestion of proteins and carbohydrates differed among organs and that such activities differ between the ...

The aim of these experiments was to apply magnesium (50 and 100 mg Mg kg soil) to neutralise the potentially negative effects of soil contamination by cadmium (10, 20, 30 and 40 mg Cd kg soil) on the number of some groups of microorganisms. Another objective was to determine the relationship between the number of these microorganisms relative to yield of yellow lupine and some physicochemical p...