Terrestrial Dissolved Organic Matter Mobilized From Eroding Permafrost Controls Microbial Community Composition and Growth in Arctic Coastal Zones
نویسندگان
چکیده
Climate warming is accelerating erosion along permafrost-dominated Arctic coasts. This results in the additional supply of organic matter (OM) and nutrients into coastal zone. In this study we investigate impact on marine microbial community composition growth rates Beaufort Sea. Dissolved (DOM) derived from three representative glacial deposit types (fluvial, lacustrine, moraine) Yukon plain, Canada, were used as substrate to cultivate bacteria using a chemostat setup. Our show that DOM (inferred UV-Visible spectroscopy) biodegradability DOC concentration, bacterial production respiration) significantly differ between types. fluvial moraine clear terrestrial characteristics with low aromaticity ( S r : 0.63 ± 0.02 SUVA 254 1.65 0.06 L mg C −1 m & 0.68 0.01 1.17 , respectively) compared lacustrine soil type 0.71 2.15 0.05 ). The difference leads development different communities. Whereas Alphaproteobacteria dominate (67 87% relative abundance, respectively), Gammaproteobacteria most abundant class for (88% abundance). Bacterial efficiency (BGE) 66% type, while 13 28% types, respectively. communities therefore strongly their net effect utilization depending eroded landscape type. high BGE value moraine-derived probably caused by larger proportion labile colorless DOM. These indicate controls activities waters. suggests biogeochemical changes zone will depend character adjacent which determine speed extent mineralization thereby carbon channeling food web. We conclude microbes respond input released differently influence microbes.
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1 Department of Geography, Northumbria University, Newcastle-Upon-Tyne, UK, 2 Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, USA, 3 Department of Land, Air, and Water Resources, University of California, Davis, Davis, CA, USA, 4 Department of Environmental Systems Science, ETH-Zurich, Zurich, Switzerland, 5 United States Geological Survey, Boulder...
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ژورنال
عنوان ژورنال: Frontiers in Earth Science
سال: 2021
ISSN: ['2296-6463']
DOI: https://doi.org/10.3389/feart.2021.640580