Benthic bacterial biomass supported by streamwater dissolved organic matter

Bott, Thomas L.; Kaplan, Louis; Kuserk, Frank T.

doi:10.1007/bf02015558

Cited by 88 publications

(50 citation statements)

References 27 publications

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“…Gross primary production and ecosystem respiration values were in the range of that found in other alpine streams in the same geographic region (Logue et al, 2004). Bacterial abundances were at or above levels found in other alpine streams (Logue et al, 2004) or even lowland streams in temperate biomes (Bott et al, 1984). Sediment respiration values further indicate that microbial activity was relatively high for these springs.…”

Section: Ecosytem Functionmentioning

confidence: 48%

Functional measures and food webs of high elevation springs in the Swiss alps

et al. 2008

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Abstract. We examined the ecosystem functioning and food webs of high elevation springs in or near the Swiss National Park. Springs originated from silicate or carbonate geologies and were near or above treeline. One iron-sulphur and three temporary springs were also included in the study. Ecosystem function was assessed in four springs via measures of bacterial abundance, sediment respiration, nutrient uptake, and ecosystem metabolism. Food webs were assessed in all 20 springs using nutrient content (C, N, P) and stable isotopes of carbon and nitrogen. Bacteria counts ranged from 1.8 to 3.410 8 cells mL -1 sediment with no significant differences between sites. Sediment respiration rates ranged from 0.13 to 0.46 mg O 2 h -1 and did not differ between springs. Uptake lengths for N ranged from 11 to 63 m, and for phosphorus from 4 to 60 m. Nitrogen uptake rates (U) ranged from 57 to 266 mg m -2 h -1 and those for P from 0.11 to 4.2 mg m -2 h -1 . Gross primary production (GPP) 15 N) were related to the specific spring types, although food webs were relatively simple with most benthic invertebrates showing omnivory. Riparian spiders partially used aquatic insects in the diet. The results suggest that these alpine springs are complex but functionally similar to forested headwater streams with simple food webs.

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Section: Ecosytem Functionmentioning

confidence: 48%

Functional measures and food webs of high elevation springs in the Swiss alps

et al. 2008

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“…Microbial biofilms living in the sediments convert allochthonous or autochthonous dissolved organic substances (Naiman et al 1987) into particulate form (Kaplan & Bott 1983, Bott et al 1984. Sediment biofilms develop a key role in the maintenance of the carbon balance in streams (Marxsen 1988, Meyer 1988).…”

Section: Introductionmentioning

confidence: 99%

Heterotrophic metabolism in a forest stream sediment: surface versus subsurface zones

Romaní¹,

Butturini²,

Sabater³

et al. 1998

Aquat. Microb. Ecol.

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The heterotrophic metabolism of a forest stream sediment was studied during leaf fall, immediately after a flood that completely scoured and homogenized the first 10 to 12 cm of sediment. After this event, differences were found between the surface sediment (0 to 3 cm depth) and the subsurface sediment (7 to 10 cm depth). Higher extracellular enzymatic and respiratory activities were measured in the surface than in the subsurface sediment. The higher heterotrophic activity was related to the higher quantity and quality of the organic matter, which accumulated in the surface sediment (higher chlorophyll and bacterial densities). The heterotrophic metabolism in the surface sediment followed a marked seasonal pattern that correlated with the variations in the environmental parameters (discharge, nutrients). However, no temporal pattern was observed in the subsurface sediment, less affected by the physical changes (e.g, scouring), where no significant change in any activity was recorded throughout the study period. There was a significant decrease in heterotrophic metabolism in the subsurface sediments. This difference can be attributed to the lower availability of algae-derived matenal in the subsurface sedirnents.

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“…Because of the chemical conlplexity and the dfficulty in separation and identification of the various components, approaches to the study of DOC oftentimes have focused on the concentration and dynamics of uncharacterized bulk material (Bott et al 1984, Ford & Lock 1987. However, this approach is limited in that dynamics of minor components may be masked.…”

Section: Introductionmentioning

confidence: 99%

Contributions of degrading Spartina alterniflora lignocellulose to the dissolved organic carbon pool of a salt marsh

Ma¹,

Hodson²

1990

Mar. Ecol. Prog. Ser.

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As Spartina alter~~iflora lignocellulose degrades, it contributes soluble degradation products to the bulk dssolved organic carbon (DOC) pool in salt marsh environments. Experiments with radlolabeled S. alterniflora hgnocelluloses show that during the initial 6 mo of decomposition, DOC accounts for 50 to 60% of the total degradation products (DOC plus CO2) of the lignin fraction of hgnocellulose; by contrast, only 20 to 30 '10 of the polysaccharide portion of S alterniflora lignocellulose accumulates as DOC during decomposition. The differences in net accumulation are most llkely due to dfferential rates of microbial utilization of the soluble compounds denved from these 2 fractions and not to differential rates of formation. As a result, although lignin comprises only 7 % of undegraded S. alterniflora lignocellulose, it may contribute as much as 30 % of the carbon in lignocellulose-derived DOC. Soluble compounds denved from hgnin show evidence of significant chemical modification, such that only a small fraction of Iignin-derived carbon is present as recognizable lignin phenols The long residence time of lignin-derived carbon in salt marsh DOC pools, relative to that for polysaccharidederived carbon, demonstrates a mechanism by which lignin may serve as a source of aquatic humlc substances and contribute to the bulk DOC pool of salt marshes in greater proportion than expected from the ratio of lignin. polysaccharides in undegraded plant material. Based on quantification of lignin oxidation products, we estimate that S. alterniflora lignocellulose, both the lignin and polysaccharide components, contributes 44 "b of the carbon in the bulk DOC pool of a Georgia salt marsh creek.

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Benthic bacterial biomass supported by streamwater dissolved organic matter

Cited by 88 publications

References 27 publications

Functional measures and food webs of high elevation springs in the Swiss alps

Functional measures and food webs of high elevation springs in the Swiss alps

Heterotrophic metabolism in a forest stream sediment: surface versus subsurface zones

Contributions of degrading Spartina alterniflora lignocellulose to the dissolved organic carbon pool of a salt marsh

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