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- W2022883197 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 40:25-35 (2005) - doi:10.3354/ame040025 Effects of sunlight on decomposition of estuarine dissolved organic C, N and P and bacterial metabolism S. Leigh McCallister1,2,*, James E. Bauer1, Joann Kelly1, Hugh W. Ducklow1 1School of Marine Science, College of William and Mary, Gloucester Point, Virginia 23062, USA2Present address: Département des sciences biologiques, Université du Québec à Montréal, CP 8888, Succ. Centre Ville,Montréal, Québec H3C 3P8, Canada *Email: leigh@vims.edu ABSTRACT: The effects of natural sunlight and microbial decomposition on DOC, DON, and DOP were investigated along the salinity gradient of a temperate coastal plain estuary. The impact of sunlight-irradiated DOM on bacterial properties (bacterial abundance, production, bacterial growth efficiency [BGE]) was also followed. Surface-water light levels resulted in no detectable abiotic production of NH4+ or PO43 or loss of DOC. Bacterial decomposition of DOC was enhanced by 27 to 200% in irradiated relative to dark treatments. There was, however, no corresponding enhancement in DON and DOP remineralization. Significant differences in bacterial decomposition of light-exposed DOC were frequently observed following prolonged incubation (>7 d), suggesting that enhanced reactivity may result from photochemical modification of higher molecular weight organic matter. BGE in light relative to dark treatments was positively correlated (r2 = 0.38, p < 0.01) with in situ NH4+ concentrations. In light treatments, significantly lower N and P remineralization in August 1999 corresponded with low in situ inorganic nutrient concentrations and bacterial growth efficiency (BGE) and with elevated bacterial DOC utilization. In contrast, enhanced DOC reactivity in April 2000 during nutrient-replete conditions corresponded with net immobilization of inorganic N and P by bacterial biomass production, but without a concomitant impact on BGE. These findings suggest that the combination of photochemical and microbial alteration of DOM may increase bacterial demand for inorganic nutrients, alter BGE, and influence the partitioning of C between bacterial biomass and respiration. KEY WORDS: DOC · DON · DOP · BGE · Phototransformation · Bacterial bioassays Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 40, No. 1. Online publication date: July 18, 2005 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2005 Inter-Research." @default.
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- W2022883197 title "Effects of sunlight on decomposition of estuarine dissolved organic C, N and P and bacterial metabolism" @default.
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