Changes of calcite precipitation and trophic conditions in two stratified hardwater lakes of the Baltic Lake District of the GDR

Koschel, Rainer; Giering, B.; Kasprzak, Peter; Proft, G.; Raidt, H.

doi:10.1080/03680770.1989.11898706

Cited by 11 publications

(8 citation statements)

References 8 publications

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“…The light organic carbon is not unusual for eutrophic lakes and is probably caused by sedimentation of microbial biomass (Hollander and Smith 2001;Teranes and Bernasconi 2005). Lake Dagow sediment is characterized by a relatively high (23-39%) content of calcium carbonate, which has built up during autochthonic and organismic calcite precipitation in the summer months (Koschel et al 1990). The carbonate was isotopically heavy (5-9%) compared with the organic matter reflecting isotope fractionation during photosynthetic biomass production and heterotrophic processes within the food web and during terminal mineralization as methanogenesis (Teranes and Bernasconi 2005).…”

Section: Discussionmentioning

confidence: 99%

Characterization of stable isotope fractionation during methane production in the sediment of a eutrophic lake, Lake Dagow, Germany

Conrad

Claus

Casper

2009

Limnology & Oceanography

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We measured d 13 C of CO 2 , CH 4 , and acetate-methyl in profundal sediment of eutrophic Lake Dagow by incubation experiments in the presence and absence of methanogenic inhibitors chloroform, bromoethane sulfonate (BES), and methyl fluoride, which have different specificities. Methyl fluoride predominantly inhibits acetoclastic methanogenesis and affects hydrogenotrophic methanogenesis relatively little. Optimization of methyl fluoride concentrations resulted in complete inhibition of acetoclastic methanogenesis. Methane was then exclusively produced by hydrogenotrophic methanogenesis and thus allowed determination of the fractionation factors specific for this methanogenic pathway. Acetate, which was then no longer consumed, accumulated and allowed determination of the isotopic signatures of the fermentatively produced acetate. BES and chloroform also inhibited CH 4 production and resulted in accumulation of acetate. The fractionation factor for hydrogenotrophic methanogenesis exhibited variability, e.g., it changed with sediment depth. The d 13 C of the methyl group of the accumulated acetate was similar to the d 13 C of sedimentary organic carbon, while that of the carboxyl group was by about 12% higher. However, the d 13 C of the acetate was by about 5% lower in samples with uninhibited compared with inhibited acetoclastic methanogenesis, indicating unusual isotopic fractionation. The isotope data were used for calculation of the relative contribution of hydrogenotrophic vs. acetoclastic methanogenesis to total CH 4 production. Contribution of hydrogenotrophic methanogenesis increased with sediment depth from about 35% to 60%, indicating that organic matter was only partially oxidized in deeper sediment layers.Eutrophic lakes usually develop an anoxic hypolimnion that lasts over much of the summer season. During the rest of the year, when the hypolimnion is oxic, only the top few centimeters of the sediment become oxidized while the rest remains reduced. In these sediments, production of CH 4 is the terminal step in the degradation of organic matter, and carbon cycling in the lakes is greatly affected by the release of CH 4 from the sediment into the water column (Rudd and Taylor 1980). Organic matter is fermented to acetate, H 2 , and CO 2 , which are subsequently converted to CH 4 . The relative contribution of acetate and H 2 plus CO 2 to CH 4 production can vary, and a mechanistic explanation for this behavior is not always available (Conrad 1999). The relative contribution of either acetoclastic or hydrogenotrophic methanogenesis also affects the d 13 C of the produced CH 4 (Whiticar 1999;Hornibrook et al. 2000). During hydrogenotrophic methanogenesis (4H 2 + CO 2 R CH 4 + 2H 2 O) the isotopically lighter carbon is strongly preferred, whereas the isotope effect is less expressed in acetoclastic methanogenesis (CH 3 COOH R CH 4 + CO 2 ), in which CH 4 is almost exclusively produced from the methyl group of the acetate (Weimer and Zeikus 1978;DeGraaf et al. 1996). Hence, the wide range of differ...

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Section: Discussionmentioning

confidence: 99%

Characterization of stable isotope fractionation during methane production in the sediment of a eutrophic lake, Lake Dagow, Germany

Conrad

Claus

Casper

2009

Limnology & Oceanography

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“…1983 ) and can significantly depress P concentration and algal biomass ( Jurinak & Griffin 1972;Wetzel 1983;Koschel et al . 1983 , 1990;Kleiner 1990). Although this natural process has been described as a regulating mechanism that removes nutrients from the water column and controls algal productivity in moderately eutrophic hardwater lakes ( Koschel et al .…”

Section: Introductionmentioning

confidence: 99%

Relationships between zooplankton community structure and phytoplankton in two lime‐treated eutrophic hardwater lakes

et al. 1998

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1. North Halfmoon Lake and Lofty Lake (Alberta, Canada) were chosen for whole‐lake liming experiments as a new restoration technology to enhance calcite precipitation and reduce eutrophication. During a 3‐year study (1991–93) the relationships between zooplankton and phytoplankton were assessed, together with the effects of lime additions. 2. Zooplankton communities were numerically dominated by rotifers, while the major contribution to biomass was due to large filter‐feeding Daphnia during the first half of the summer season. In Lofty Lake, cladocerans made up to 93% of biomass, whereas in North Halfmoon Lake both cladocerans and calanoids were strongly represented. 3. Total zooplankton and cladoceran biomasses were inversely correlated with chlorophyll a (chl a). The same relationship was found between large Daphnia (≥ 1 mm) and chl a. These relationships suggest that the decline in Daphnia may have been caused by an increase in cyanobacteria biomass during bloom events. 4. There were minor changes in rotifer populations after liming; however, these changes have been caused by natural year‐to‐year variation rather than liming. In general, cladocerans showed an increase in body size and population biomass when pre and post‐treatment data were compared by means of ANCOVA. Statistical analysis showed that there were more cladocerans per unit of chl a after liming; however, further research is needed to relate these patterns unambiguously to the application of lime as a restoration technology.

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“…This lake has a surface area of 0.3 km 2 , a maximum depth of 9.5 m, mean depth of 5 m and volume of 8.2 x 106 m 3 , with conductivity of 340 µS cm -1 , pH range of 7.2 -9.2 and PO 4 -P concentration of 114 mgL -1 (Brook Lemma et al, 2001). The eutrophication of Lake Dagowsee dates back to the 1960s when breeding of carp and ducks was carried out in it (Koschel et al, 1990 Lemma et al, 2001) to restore the lake for the safe use of its fishery resources and summer recreation.…”

Section: Description Of the Study Sitementioning

confidence: 99%

“…Lake Dagowsee, a hypertrophic lake (Koschel et al, 1990), is located at 13 0 04' E and 53 0 08' N at an altitude of 60.2 m above sea-level very close to Lake Stechlin of the Baltic Lake District in one of Germany's well-known natural conservation areas (See figure drawn to scale in Brook Lemma et al, 2001). This lake has a surface area of 0.3 km 2 , a maximum depth of 9.5 m, mean depth of 5 m and volume of 8.2 x 106 m 3 , with conductivity of 340 µS cm -1 , pH range of 7.2 -9.2 and PO 4 -P concentration of 114 mgL -1 (Brook Lemma et al, 2001).…”

Section: Description Of the Study Sitementioning

confidence: 99%

Diel vertical migration of zooplankton in a hypertrophic shallow temperate lake, Germany

Lemma

2005

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ABSTRACT:Zooplankton as important links in the food web of aquatic ecosystems have been studied extensively. In current literature their diel vertical migration (DVM) is a highly discussed issue. In this investigation DVM by zooplankton is studied in a hypertrophic shallow lake in Germany. The objectives of the study were to see if DVM by zooplankton occurs in shallow lakes such as Lake Dagowsee, the possible overlap in DVM of Leptodora kindtii, an invertebrate predator, and zoopankton, and the effect of wind action on DVM. It was found out that DVM of zooplankton occurs in Lake Dagowsee despite the limited range of depth for migration, wind action can influence DVM and L. kindtii poses a complex situation in relation to DVM behaviour of zooplankton in Lake Dagowsee. Finally, further studies are suggested with regard to DVM variation between different species, size and hybrid groups of Daphnids, and identification of the light sensitive range that can cue DVM of zooplankton and L. kindtii in temperate and tropical waters.

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Changes of calcite precipitation and trophic conditions in two stratified hardwater lakes of the Baltic Lake District of the GDR

Cited by 11 publications

References 8 publications

Characterization of stable isotope fractionation during methane production in the sediment of a eutrophic lake, Lake Dagow, Germany

Characterization of stable isotope fractionation during methane production in the sediment of a eutrophic lake, Lake Dagow, Germany

Relationships between zooplankton community structure and phytoplankton in two lime‐treated eutrophic hardwater lakes

Diel vertical migration of zooplankton in a hypertrophic shallow temperate lake, Germany

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