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- W4287306705 abstract "Abstract. Oceanic bacterial communities process a major fraction of marine organic carbon, with a substantial portion of this carbon transformation occurring in the mesopelagic zone, and a further fraction fueling bacteria in the bathypelagic zone. However, the capabilities and limitations of the diverse microbial communities at these depths to degrade high molecular weight (HMW) organic matter are not well constrained. Here, we compared the responses of distinct microbial communities from North Atlantic epipelagic, mesopelagic, and bathypelagic waters at two open ocean stations to the same input of diatom-derived HMW particulate and dissolved organic matter. Microbial community composition and functional responses – as measured by polysaccharide hydrolase, glucosidase, and peptidase activities – were very similar between the stations, which were separated by 1370 km, but showed distinct patterns with depth. Changes in microbial community composition coincided with changes in enzymatic activities. In epipelagic mesocosms, the spectrum of peptidase activities became especially broad and glucosidase activities were very high, a pattern not seen at other depths. The spectrum of polysaccharide hydrolase activities was enhanced particularly in epipelagic and mesopelagic mesocosms, with fewer enhancements in rates or spectrum in bathypelagic waters. The timing and magnitude of these distinct functional responses to the same HMW organic matter varied with depth. Our results highlight the importance of residence times at specific depths in determining the nature and quantity of organic matter reaching the deep sea." @default.
- W4287306705 created "2022-07-25" @default.
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- W4287306705 date "2022-07-25" @default.
- W4287306705 modified "2023-10-17" @default.
- W4287306705 title "Depth-related patterns in microbial community responses to complex organic matter in the western North Atlantic Ocean" @default.
- W4287306705 doi "https://doi.org/10.5194/egusphere-2022-682" @default.
- W4287306705 hasPublicationYear "2022" @default.
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