2000
DOI: 10.1002/(sici)1522-2632(200003)85:1<95::aid-iroh95>3.3.co;2-4
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Extracellular Enzyme Activity Associated with Degradation of Beech Wood in a Central European Stream

Abstract: The degradation of beech wood (Fagus sylvatica L.) was followed over 16 months in a central European upland stream, the Breitenbach. 1 cm 3 cubes of beech wood were placed on the stream bed and sampled at monthly intervals. Besides mass loss, fungal biomass (ergosterol content) and lignin content, the activity of two extracellular enzymes was measured: -D-glucosidase, an enzyme involved in the degradation of cellulose, and phenoloxidase, a ligninolytic enzyme. The suitability of the fluorigenic model substrate… Show more

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Cited by 6 publications
(12 citation statements)
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“…Hypostomus pyrineusi had the double effect of lower K m and higher activity of β-glucosidase in its proximal intestine gut wall. These results are important because microbes degrading the cellulose of wood in the river excrete enzymes extracellularly (Sinsabaugh et al 1991 , 1992 ; Tank et al 1998 ; Hendel and Marxsen 2000 ) and depend on di- and monosaccharides [such as cellobiose (a β-glucoside) and glucose, respectively] to diffuse back to them so that they can then further digest and assimilate (Allison and Jastrow 2006 ) the cellulose. The fishes consume wood detritus that is in this process of degradation and, thus, there are likely many soluble components, such as cellobiose, in the decaying wood.…”
Section: Discussionmentioning
confidence: 99%
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“…Hypostomus pyrineusi had the double effect of lower K m and higher activity of β-glucosidase in its proximal intestine gut wall. These results are important because microbes degrading the cellulose of wood in the river excrete enzymes extracellularly (Sinsabaugh et al 1991 , 1992 ; Tank et al 1998 ; Hendel and Marxsen 2000 ) and depend on di- and monosaccharides [such as cellobiose (a β-glucoside) and glucose, respectively] to diffuse back to them so that they can then further digest and assimilate (Allison and Jastrow 2006 ) the cellulose. The fishes consume wood detritus that is in this process of degradation and, thus, there are likely many soluble components, such as cellobiose, in the decaying wood.…”
Section: Discussionmentioning
confidence: 99%
“…Because the fishes’ β-glucosidases are more efficient than those produced by the microbes degrading the wood, the fish quickly digest and assimilate the cellobiose in their detrital diet. Additionally, because microbes in the environment secrete digestive enzymes extracellularly, the enzymes themselves are also likely on the detritus (Sinsabaugh et al 1991 , 1992 ; Tank et al 1998 ; Hendel and Marxsen 2000 ), as occurs in soils (Allison 2006 ; Allison and Jastrow 2006 ), and are thus digested within the guts of the fish. This may explain why the microbial extract enzyme activities, almost without exception (Tables S2, S3; Figs.…”
Section: Discussionmentioning
confidence: 99%
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“…Although fungal biomass and/or microbial respiration associated with decomposing wood has been estimated in a few studies (e.g. Golladay & Sinsabaugh, 1991; Tank, Webster & Benfield, 1993; Maharning & Bärlocher, 1996; Hendel & Marxsen, 2000; Díez et al. , 2002; Stelzer et al.…”
Section: Effects Of Nutrients On Microbial Activitymentioning
confidence: 99%
“…The available research on wood breakdown in rivers differs in the type and size of wood samples used, e.g. from thin plates (Tank et al ., 1998) or 1 cm 3 cubes (Hendel & Marxsen, 2000) to logs up to 32 cm in diameter (Webster et al ., 1999). This makes comparisons difficult, although an inverse relationship between breakdown rate and wood size has been reported from both terrestrial (Harmon et al ., 1986) and aquatic environments (Golladay & Webster, 1988; Webster et al ., 1999).…”
Section: Wood Mass Lossmentioning
confidence: 99%