1996
DOI: 10.3354/meps135309
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Photodegradation or photoalteration? Microbial assay of the effect of UV-B on dissolved organic matter

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Cited by 50 publications
(28 citation statements)
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“…Solar UV radiation has been shown to degrade dissolved organic carbon (DOC) photolytically, most of the DOC being of terrestrial origin and relatively resistant to other forces [30]. Humic substances are fairly resistant to bacterial degradation, but after photolytic activity the products (e.g., formaldehyde, acetaldehyde, glyoxylate and pyruvate) are readily taken up by bacterioplankton [31].…”
Section: Dissolved Organic Matter and Solar Uv Radiationmentioning
confidence: 99%
“…Solar UV radiation has been shown to degrade dissolved organic carbon (DOC) photolytically, most of the DOC being of terrestrial origin and relatively resistant to other forces [30]. Humic substances are fairly resistant to bacterial degradation, but after photolytic activity the products (e.g., formaldehyde, acetaldehyde, glyoxylate and pyruvate) are readily taken up by bacterioplankton [31].…”
Section: Dissolved Organic Matter and Solar Uv Radiationmentioning
confidence: 99%
“…down to 50 m; Browman et al 2000, Morán & Zepp 2000 and may influence community structure and function (Winter et al 2001). For instance, UVR can influence bacterioplankton remineralization processes by (1) photochemical dissociation of dissolved organic matter (DOM) into smaller labile molecules, (2) incrementing algal DOM release by stress (Kieber et al 1989, Mopper et al 1991, Naganuma et al 1996 and, (3) reducing predatory activity (Sommaruga & Buma 2000). Indirectly, UVR can produce toxic photochemical substances like superoxide radicals and the release of toxic metals like copper or aluminum that may impair bacterioplankton activity (Chatila et al 1999).…”
Section: Introductionmentioning
confidence: 99%
“…On the other hand, DOM might also be rendered more biorefractory (Keil & Kirchman 1994, Naganuma et al 1996, Kieber et al 1997, Pausz & Herndl 1999, Obernosterer & Herndl 2000. Tranvik & Kokalj (1998) showed that fresh algal extracts became less available to the microbial community after UV radiation in the presence of humic substances.…”
Section: Influence Of Solar Radiation On Substrate Availability For Bmentioning
confidence: 99%
“…Recent studies have demonstrated that the exposure of labile DOM to UV radiation renders it more refractory (Keil & Kirchman 1994, Naganuma et al 1996, Tranvik & Kokalj 1998, Obernosterer et al 1999, Pausz & Herndl 1999, suggesting that photochemical reactions are also involved in the production of biorefractory DOM (Kieber et al 1997). As shown by Keil & Kirchman (1994) and Tranvik & Kokalj (1998), the presence of natural DOM is essential to convert labile DOM (proteins and algal exudates) into refractory DOM upon exposure to solar radiation.…”
mentioning
confidence: 99%