Distribution of labile dissolved organic carbon in Lake Michigan

Laird, Gwenyth A.; Scavia, Donald

doi:10.4319/lo.1990.35.2.0443

Cited by 15 publications

(12 citation statements)

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“…In all cases, OC L was a minor component of the TOC pool (on average about 20%), irrespective of lake productivity. In all the lakes, most ( c. 80%) of the DOC pool was refractory, agreeing with published data obtained from measurements of bacterial production and DOC depletion (Laird & Scavia, 1990; Sondergaard & Middleboe, 1995; Weiss & Simon, 1999). In contrast, a larger fraction (27–55%) of the POC pool was labile.…”

Section: Bod In Unfiltered and Filtered Lake Watersupporting

confidence: 90%

“…The concentrations of the dissolved and particulate OC L relative to their respective DOC and POC pools were estimated by the ratios of BOD ultd /DOC and BOD ultp /POC (where BOD ultd and BOD ultp are the ultimate BOD values obtained from for dissolved and particulate OC L respectively). The percentage of the labile organic carbon fraction in DOC varied within narrow limits, from 10% to 12% (Table 4), in good correspondence with the data reported from measurements of bacterial production and DOC depletion in L. Michigan (Laird & Scavia, 1990) and L. Constance (Weiss & Simon, 1999); see also reviews by Sondergaard & Borch (1992) and Sondergaard & Middleboe (1995). The percentage of the labile organic carbon fraction in POC (27–55%) was significantly higher than in DOC and did not appear to be related to the lake trophic status (Table 4).…”

Section: Bod In Unfiltered and Filtered Lake Watersupporting

confidence: 84%

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Lability of organic carbon in lakes of different trophic status

2009

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1. We used first-order kinetic parameters of biological oxygen demand (BOD), the constant of aerobic decomposition (k) and the asymptotic value of BOD (BOD ult ), to characterise the lability of organic carbon pools in six lakes of different trophic state: L. Naroch, L. Miastro and L. Batorino (Belarus), L. Kinneret (Israel), L. Ladoga (Russia) and L. Mendota (U.S.A.). The relative contributions of labile and refractory organic carbon fractions to the pool of total organic carbon (TOC) in these lakes were quantified. We also determined the amounts of labile organic carbon within the dissolved and particulate TOC pools in the three Belarus lakes. 2. Mean annual chlorophyll concentrations (used as a proxy for lake trophic state) ranged from 2.3 to 50.6 lg L )1 , labile organic carbon (OC L = 0.3BOD ult ) from 0.75 to 2.95 mg C L )1 and k from 0.044 to 0.14 day )1 . 3. Our data showed that there were greater concentrations of OC L but lower k values in more productive lakes. 4. In all cases, the DOC fraction dominated the TOC pool. OC L was a minor component of the TOC pool averaging about 20%, irrespective of lake trophic state. 5. In all the lakes, most (c. 85%) of the DOC pool was refractory, corresponding with published data based on measurements of bacterial production and DOC depletion. In contrast, a larger fraction (27-55%) of the particulate organic carbon (POC) pool was labile. The relative amount of POC in the TOC pool tended to increase with increasing lake productivity. 6. Long-term BOD incubations can be valuable in quantifying the rates of breakdown of the combined particulate and dissolved organic carbon pools and in characterising the relative proportions of the labile and recalcitrant fractions of these pools. If verified from a larger number of lakes our results could have important general implications.

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Section: Bod In Unfiltered and Filtered Lake Watersupporting

confidence: 90%

Section: Bod In Unfiltered and Filtered Lake Watersupporting

confidence: 84%

Lability of organic carbon in lakes of different trophic status

2009

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“…Many studies of DOC lability and consumption have assumed that variations in bacterial production or abundance reflect proportional changes in carbon consumption (e.g. Laird and Scavia, 1990; Miller and Moran, 1997). In addition, much of what is known about bacterial carbon cycling in aquatic ecosystems is also based almost entirely on BP measurements and rests on this same assumption (Jahnke and Craven, 1995; del Giorgio and Cole, 1998).…”

Section: Discussionmentioning

confidence: 99%

Phosphorus and DOC availability influence the partitioning between bacterioplankton production and respiration in tidal marsh ecosystems

Giorgio

Newell

2012

Environmental Microbiology

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Summary The organic carbon consumed by aquatic bacteria (BCC) is partitioned between bacterial production (BP) and respiration (BR), but the factors that determine BCC and its partition into BP and BR are not well understood. We explored the coupling between BR, BR and BCC, and their links to dissolved organic carbon (DOC) and nutrient availability in natural and restored tidal marshes and in the adjoining waters of Delaware Bay estuary. Labile DOC (LDOC) ranged from 3% to 22% of the DOC pool, and explained more of the variance in both BR and BCC than did bulk DOC. Bacterial growth efficiency (BGE) was highly variable (0.09–0.58), and natural Spartina alterniflora marshes had consistently higher BGE than both restoration marshes and tidal floodwaters. BGE was negatively related to the ratio of LDOC to total dissolved phosphorous, which was highest in natural marshes. The enhancement of BP observed in the marshes relative to the estuarine floodwaters had different origins: In natural marshes it was mostly due to increases in BGE, whereas in restored marshes it followed increased BCC. These results highlight the importance of P in regulating microbial metabolism in coastal areas, and the need to understand the pathways that lead to BP in these systems.

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“…Compared with those lakes, the DOC concentration in Lake Baikal is low. Lake Michigan, one of the Great Lakes, showed a rather high DOC concentration of 175 µM C (Laird and Scavia 1990). The level of DOC in Lake Baikal was comparable to that in Lake Biwa (80-150 µM C) (Hori et al 1998).…”

Section: Riverine and Lacustrine Doc Concentrationsmentioning

confidence: 86%