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Dynamics of dissolved organic carbon lability in a eutrophic lake Søndergaard, M.; Hansen, B.; Markager, S. (1995). Dynamics of dissolved organic carbon lability in a eutrophic lake. Limnol. Oceanogr. 40(1): 46-54 In: Limnology and Oceanography. American Society of Limnology and Oceanography: Waco, Tex., etc. ISSN 0024-3590; e-ISSN 1939-5590, meer

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Beschikbaar in	Auteurs
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Trefwoorden

Aquatic communities > Plankton Behaviour > Feeding behaviour > Grazing Composition > Community composition Microorganisms > Bacteria Organic compounds > Carbohydrates > Glycosides > Pigments > Photosynthetic pigments > Chlorophylls Organic matter > Carbon > Organic carbon Organic matter > Carbon > Organic carbon > Dissolved organic matter > Dissolved organic carbon Population characteristics > Biomass Water bodies > Inland waters > Lakes Water bodies > Inland waters > Lakes > Eutrophic lakes Water bodies > Inland waters > Lakes > Freshwater lakes Zoet water

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Auteurs		Top
Søndergaard, M. Hansen, B. Markager, S.

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Abstract

The concentration of labile dissolved organic C ([DOCL]) and the plankton community structure were measured weekly during a diatom spring bloom and the subsequent clear-water phase in a eutrophic, temperate lake. The DOCL concentration was assessed by a bacterial regrowth method based on direct measurements of the increase in bacterial biomass and its respiratory demand. [DOCL] ranged from 560 to 1,130 mu g C liter and accounted for only 5-9% of total DOC. DOCL oscillated around 800 mu g C/liter, and the amplitude over 7-d periods was within plus or minus 16% of the in situ bacterial carbon demand. One period (3 weeks) with consistently increasing [DOCL] took place concomitant with the increase in macrozooplankton and bacterial biomass. Thus, DOCL was positively related to decreases in chlorophyll and zooplankton grazing. The increase in DOCL was followed by 3 weeks with decreasing concentrations, when the relationship between DOCL and bacterial production was negative. This pattern gives support to the hypothesis that grazing is a quantitatively important process in the flow of carbon to bacteria. The variations of DOCL were analyzed with a model describing interactions among substrate, bacteria, and grazing. Short-term (days) oscillations probably result from pulses of substrate production that are followed within a few days by bacterial uptake, and long-term (weeks) variations are explained by a variable bacterial substrate affinity (Km).

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