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• W2318824225 abstract "AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials AME 64:275-284 (2011) - DOI: https://doi.org/10.3354/ame01530 Bioavailability of organic matter photodissolved from coastal sediments Lawrence M. Mayer*, Kathleen H. Thornton, Linda L. Schick School of Marine Sciences, Darling Marine Center, University of Maine, Walpole, Maine 04573, USA *Email: Lmayer@maine.edu ABSTRACT: Photodissolution converts particulate organic matter to dissolved organic matter, which may affect its availability to heterotrophic organisms. We examined the ability of planktonic microbes to utilize photodissolved organic matter (PDOM) obtained from irradiating coastal sediments and a preparation of algal membranes. About half of the organic carbon that was photodissolved from algal particulate detritus was subsequently available to microbes over 2 wk of incubation in the dark, while that from the sediments appeared to be less bioavailable, the extent of utilization being 16 to 29%. Losses in total organic carbon during microbial incubation appeared as dissolved inorganic carbon, substantiating our inference of microbial usage. Accumulation of bacterial biomass was small relative to respiratory loss, which may be due to low growth efficiency by bacteria, or possibly grazing. Photoammonification converted some of the particulate nitrogen into inorganic ammonium; in the subsequent microbial processing of PDOM from sediments, this ammonium was reincorporated into organic matter. Thus, photodissolution shifts particulate organic matter to physical and chemical forms less available to metazoans and more available to osmotrophic microbes. This bioavailability, on a time scale of weeks, indicates that PDOM produced in nearshore resuspension zones can add fuel to planktonic microbial regeneration processes while the water remains on the shelf, but that major fractions of the PDOM are likely to be exported offshore. KEY WORDS: Photodissolution · Bioavailability · Bacteria · Dissolved organic matter · Resuspended sediments · Photoammonification Full text in pdf format PreviousNextCite this article as: Mayer LM, Thornton KH, Schick LL (2011) Bioavailability of organic matter photodissolved from coastal sediments. Aquat Microb Ecol 64:275-284. https://doi.org/10.3354/ame01530 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 64, No. 3. Online publication date: September 20, 2011 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2011 Inter-Research." @default.
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• W2318824225 date "2011-09-20" @default.
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• W2318824225 title "Bioavailability of organic matter photodissolved from coastal sediments" @default.
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