Seasonal variations in the composition of fulvic acids in Tjeukemeer, The Netherlands, as studied by Curie-point pyrolysis-mass spectrometry

Haan, H. De; Halma, G.; Boer, T. De; Haverkamp, Johan

doi:10.1007/bf00011945

Cited by 21 publications

(5 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As nematodes play an important role in benthic food webs (Bott & Kaplan, 1989; Bott, 1995; Traunspurger, Bergtold & Goedkoop, 1997), effects of refractory DOM on nematodes may have consequences on the whole benthic community structure. In freshwater systems, the quality and quantity of refractory DOM can vary widely between different ecosystems (Thurman, 1985), between different habitats within an ecosystem (Wetzel, 1983), and across different seasons (De Haan et al , 1981). Hence, the influence of refractory DOM on freshwater organisms probably differs locally and temporally and its influence on community structure is likely to depend on the quantity and quality of DOM, as well as on the reactions of organisms to the DOM they are exposed to.…”

Section: Discussionmentioning

confidence: 99%

Refractory dissolved organic matter can influence the reproduction of Caenorhabditis elegans (Nematoda)

Höss¹,

Bergtold²,

Haitzer³

et al. 2001

Freshwater Biology

View full text Add to dashboard Cite

1. We investigated the effect of refractory dissolved organic matter (refractory DOM: fulvic acids (FAs) and ultrafiltrates (UFs)), isolated from five different sources, on the reproduction of the bacterivorous nematode Caenorhabditis elegans. Nematodes were exposed to DOM (0.5–64 mg L−1 dissolved organic carbon) during a whole life cycle (72 h). At the end of the test, the number of offspring per worm was determined.  2. We also studied the effect of refractory DOM on abundance, cell size, and activity of the bacteria (Escherichia coli) that were used as a food source for the nematodes, to assess possible indirect effects of DOM via the food organisms.  3. The effects of DOM on the reproduction of C. elegans varied, depending on the origin and concentration of DOM. FAs isolated from a soil leachate and from the effluent of a waste water plant, as well as UFs from a humic lake and from a marsh, stimulated the reproduction of C. elegans. FAs from ground water had no effect, while FAs from a humic lake inhibited the reproduction of the nematodes. All effects occurred at ecologically relevant DOM concentrations and showed clear dose–response relationships.  4. Neither bacterial abundance nor cell size were influenced by refractory DOM. Bacterial activity was unaffected by four types of DOM. Only FAs from the humic lake caused a significant decrease in bacterial activity over 72 h.  5. The negative effect of FAs from the humic lake on nematode reproduction may be a consequence of a lower bacterial activity in this treatment. The positive effects of refractory DOM, however, could not be related to bacterial parameters. Therefore, we assume that the DOM directly influenced the reproduction of C. elegans. We speculate that refractory DOM can potentially be an additional carbon source or a source of trace nutrients influencing the reproduction of C. elegans. Adsorption of refractory DOM on bacterial cells, serving as food for the nematodes, may have been an important factor for the availability of DOM for C. elegans.

show abstract

Section: Discussionmentioning

confidence: 99%

Refractory dissolved organic matter can influence the reproduction of Caenorhabditis elegans (Nematoda)

Höss¹,

Bergtold²,

Haitzer³

et al. 2001

Freshwater Biology

View full text Add to dashboard Cite

show abstract

“…Abiotic chemical pathways occurring after extended exposure to sunlight and oxygenated conditions that are consistent with these changes include oxidation of fused aromatic rings or aromatic rings with electron-withdrawing substituents (both of which are much more readily oxidized than benzene), oxidativecoupling reactions, quinone formation reactions, and bleaching of aromatic structures by UV-radiation (Gjessing 1970;Frimmel and Bauer 1987;Chen et al 1978). Microbial alteration of fulvic acid was detected in water samples from a humic-rich polder lake in The Netherlands (DeHaan 1977;Steinburg and Muenster 1985) and could have occurred in these lakes as well. DeHaan (1977) observed an increase in phcnolic hydroxyl groups, but the opposite trend was observed in Spirit Lake.…”

Section: Discussionmentioning

confidence: 99%

“…Microbial alteration of fulvic acid was detected in water samples from a humic-rich polder lake in The Netherlands (DeHaan 1977;Steinburg and Muenster 1985) and could have occurred in these lakes as well. DeHaan (1977) observed an increase in phcnolic hydroxyl groups, but the opposite trend was observed in Spirit Lake.…”

Section: Discussionmentioning

confidence: 99%

“…The fact that both the sulfur content and the Cu-completing properties underwent little change between 1981 and 1983, whereas phenolic hydroxyl continued to decrease, would support the hypothesis that these strong binding sites involved sulfur-containing groups. Seasonal variations in metal-binding capacity of lake water have been observed to occur in a humic-rich polder-lake, but these changes were associated with changes in blue-green bacterial populations rather than with changes in the chemical nature of the fulvic acids (DeHaan et al 1981a).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Rapid changes in dissolved humic substances in Spirit Lake and South Fork Castle Lake, Washington

McKnight

Thorn

Wershaw

et al. 1988

Limnology & Oceanography

View full text Add to dashboard Cite

One major effect of the eruption of Mount St. Helens, Washington, was a large increase of dissolved organic material in the lakes of the area devastated near the volcano. Much of this material was aquatic fulvic acid derived from plants and soils from the surrounding watershed. During the 3 yr after the eruption, substantial chemical changes occurred in the aquatic fulvic acid: a decrease in total sulfur content and in the content of aliphatic and heterocyclic sulfur groups; an increase in carbohydrate content and in polysaccharide pyrolysis fragments; a decrease in phenolic hydroxyl content; an increase in the heterogeneity of the fulvic acid material; ancl a decrease in copper-completing properties. Natural abundance 'JC-NMR (nuclear magnetic resonance spectra), also showed a progressive change in the distribution of carbon atoms with aliphatic moieties becoming more abundant than aromatic moieties. These changes were more likely to have been caused by alterations of fulvic acid molecules on exposure to sunlight, by oxygenated conditions, and by microbial transformation in the epilimnion rather than by new sources of fulvic acid. These results demonstrate that rapid changes may occur within the heterogeneous mixture of molecules comprising fulvic acid, which has been generally described as a refractory or stable pool of dissolved organic material.We thank R. Wissmar and C. Dahm for collecting some of the water samples from which the aquatic fulvic acids were isolated, and M. Perdue for making laboratory facilities available in 1981. We thank D. Larson from the U.S. Army Corps of Engineers, personnel from Oregon State University, and J. Goad for their assistance in collecting water samples in 1983. We acknowledge C. Dahm, M. Perdue, J. LaBaugh, J. Mannsky, J. Ertel, R. Smith, and two anonymous reviewers for helpful comments on the manuscript.

show abstract

“…The fractionation and composition of fulvic acids have been intensively studied by gel filtration (De Haan 1972a, b ;De Haan & De Boer 1978 and by Curie-point pyrolysis-mass spectrometry , 1981 . According to Sephadex G-25 gel filtration at pH 7 .0, fulvic acids consist of three main fractions with different molecular weights (Fig .…”

Section: Organic Mattermentioning

confidence: 99%

Physico-chemical environment in Tjeukemeer with special reference to speciation of algal nutrients

Haan¹

1982

Hydrobiologia

Self Cite

View full text Add to dashboard Cite

This paper attempts to generalize the major controlling factors and their impacts on the physico-chemical environment in Tjeukemeer in relation to the speciation of algal nutrients .M orphometry, man-made hydrology, climate, chemistry of drainage area and biology of the lake appear to control its physico-chemistry the most . Thus the shallow Tjeukemeer is vulnerable to wind and therefore almost always completely mixed and often turbid owing to resuspended sediments . In normal summers the lake is oligohaline, hard, eutrophic and alkaline, and in winter it is hard, eutrophic, alkaline and humus-rich . The implications of these properties on the following physico-chemical components and their relevance for the speciation of algal nutrients are discussed : turbidity, colour, halinity, pH, alkalinity, salinity, conductivity, ionic composition, ionic balance and organic matter .Because of the relationships between the physico-chemical environment on the one hand and the speciation and bio-availability of nutrients on the other hand, special attention is given to the speciation of some major and minor elements as derived from ultra filtration experiments . In this context, the metal binding capacity of the organic matter (mainly fulvic acids) is also considered .

show abstract

Seasonal variations in the composition of fulvic acids in Tjeukemeer, The Netherlands, as studied by Curie-point pyrolysis-mass spectrometry

Cited by 21 publications

References 11 publications

Refractory dissolved organic matter can influence the reproduction of Caenorhabditis elegans (Nematoda)

Refractory dissolved organic matter can influence the reproduction of Caenorhabditis elegans (Nematoda)

Rapid changes in dissolved humic substances in Spirit Lake and South Fork Castle Lake, Washington

Physico-chemical environment in Tjeukemeer with special reference to speciation of algal nutrients

Contact Info

Product

Resources

About