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Climate displaces deposition as dominant driver of dissolved organic carbon concentrations in historically acidified lakes.
Biogeochemistry
December 2024
Department of Natural Resources and the Environment, University of New Hampshire, 56 College Road, Durham, NH USA.
Unlabelled: Climate and atmospheric deposition interact with watershed properties to drive dissolved organic carbon (DOC) concentrations in lakes. Because drivers of DOC concentration are inter-related and interact, it is challenging to assign a single dominant driver to changes in lake DOC concentration across spatiotemporal scales. Leveraging forty years of data across sixteen lakes, we used structural equation modeling to show that the impact of climate, as moderated by watershed characteristics, has become more dominant in recent decades, superseding the influence of sulfate deposition that was observed in the 1980s.
View Article and Find Full Text PDFExtreme abiotics drive sediment biocomplexity along pH gradients in a shallow submarine volcanic vent.
Mar Pollut Bull
December 2024
Department of Earth and Marine Sciences, University of Palermo, via Archirafi 18, 90123 Palermo, Italy; National Biodiversity Future Center (NBFC), Piazza Marina 61, 90133 Palermo, Italy; CoNISMa, National Interuniversity Consortium for Marine Sciences, Piazzale Flaminio 9, 00196 Roma, Italy.
Volcanic emissions in shallow vents influence the biogeochemistry of the sedimentary compartment, creating marked abiotic gradients. We assessed the spatial dynamics of the sediment compartment, as for the composition and origin of organic matter and associated prokaryotic community, in a volcanic shallow CO vent (Vulcano Island, Italy). Based on elemental (carbon, nitrogen content and their ratio) and isotopic composition (δC, δN and δS), the contribution of vent-derived organic matter (microbial mats) to sedimentary organic matter was high close to the vent, while the marine-derived end-members (seagrasses) contributed highly at increasing distance.
View Article and Find Full Text PDFRecent advances in the study of mercury biogeochemistry in Arctic permafrost ecosystems.
Sci Total Environ
December 2024
Centro de Química Estrutural, Institute of Molecular Sciences and Department of Chemical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal; Centre d´études nordiques (CEN), Université Laval, Québec, QC G1V 0A6, Canada. Electronic address:
Permafrost predominates in polar and high mountain regions, encompassing nearly 15 % of the exposed land in the Northern Hemisphere. It denotes soil or rock that remains at or below 0 °C for the duration of at least two consecutive years. These frozen soils serve as a barrier to contaminants that are stored and accumulated in permafrost over extended periods of time.
View Article and Find Full Text PDFFeels Like Home: A Biobased and Biodegradable Plastic Offers a Novel Habitat for Diverse Plant Pathogenic Fungi in Temperate Forest Ecosystems.
Microb Ecol
December 2024
Institute of Bioanalysis, Coburg University of Applied Sciences and Arts, Coburg, Germany.
Poly(butylene succinate-co-adipate) (PBSA), a biodegradable plastic, is significantly colonized and degraded by soil microbes under natural field conditions, especially by fungal plant pathogens, raising concerns about potential economic losses. This study hypothesizes that the degradation of biodegradable plastics may increase the presence and abundance of plant pathogens by serving as an additional carbon source, ultimately posing a risk to forest ecosystems. We investigated (i) fungal plant pathogens during the exposure of PBSA in European broadleaved and coniferous forests (two forest types), with a specific focus on potential risk to tree health, and (ii) the response of such fungi to environmental factors, including tree species, soil pH, nutrient availability, moisture content, and the physicochemical properties of leaf litter layer.
View Article and Find Full Text PDFNutrient colimitation is a quantitative, dynamic property of microbial populations.
Proc Natl Acad Sci U S A
December 2024
Department of Environmental Systems Science, Swiss Federal Institute of Technology (ETH) Zurich, Zurich 8006, Switzerland.
Resource availability dictates how fast and how much microbial populations grow. Quantifying the relationship between microbial growth and resource concentrations makes it possible to promote, inhibit, and predict microbial activity. Microbes require many resources, including macronutrients (e.
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