Novel evaluations of sources and sinks of dissolved oxygen via stable isotopes in lentic water bodies

Dordoni, Marlene; Seewald, Michael; Rinke, Karsten; Schmidmeier, Jakob; Barth, Johannes A. C.

doi:10.1016/j.scitotenv.2022.156541

Cited by 11 publications

(23 citation statements)

References 45 publications

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“…Altogether, these findings suggest a relation between the MOM and a productive biotic assemblage in vertical proximity above the MOM. This connection is supported by data from the literature (Kreling 215 et al, 2017;McDonald et al, 2022) and was already highlighted independently by previous studies with dissolved oxygen isotope insights on the Rappbode Reservoir (Dordoni et al, 2022).…”

supporting

confidence: 73%

“…We also applied this approach to a Metalimnetic Oxygen Minimum (MOM) in the reservoir. Here, carbon turnover may be more pronounced as it is known for its strong depletion in dissolved oxygen (Shapiro, 1960;Nix, 1981;Kreling et al, 2017;Dordoni et al, 2022). The Rappbode Reservoir was ideal for this study because in recent years its logistic settings helped to develop it into an increasingly acknowledged large-scale laboratory of ecological behaviour for man-made lentic water bodies (Kong et al, 2019;Wentzky et al, 2019; 85 Herzsprung et al, 2020;Mi et al, 2020).…”

mentioning

confidence: 99%

“…Likely modifications 295 of metabolic balances would also compromise the water quality. Overall, a comparison between DIC production rates with DO depletion rates as described by Dordoni et al (2022) should be evaluated in order to prove the consistency of both isotope approaches. Such investigations will be subject of future studies.…”

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confidence: 99%

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Mineralization of autochthonous particulate organic carbon is a fast channel of organic matter turnover in Germany’s largest drinking water reservoir

Dordoni

Seewald

Rinke

et al. 2022

Preprint

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Abstract. Turnover of organic matter (OM) is an essential ecological function in inland water bodies and relevant for water quality especially for the potential of dissolved organic carbon (DOC) removal as well as due to emissions of CO2. We investigated various sources of OM including DOC, autochthonous particulate organic carbon (POC), allochthonous particulate organic carbon (ExtPOC), and sedimentary matter (SED) in a temperate drinking water reservoir (Rappbode Reservoir, Germany) with respect to carbon isotope ratios and concentration dynamics. For this purpose, we focused on the metalimnion and the hypolimnion, where respiratory turnover is expected to be dominant and hardly disturbed by atmospheric exchange. The observation period of nine months covered a complete stratification period of the water body. Dissolved inorganic carbon (DIC) concentrations and its isotopes (δ13CDIC) were considered together with isotope data of DOC and POC (δ13CDOC and δ13CPOC) as input parameters for mass balances. DIC concentrations ranged between 0.30 and 0.53 mmol L-1, while δ13CDIC values were between -15.1 and -7.2 ‰ versus the VPDB (Vienna PeeDee Belemnite) standard. Values of δ13CDOC and δ13CPOC ranged between -28.8 and -27.6 ‰ and between -35.2 and -26.8 ‰, respectively. Isotope compositions of sedimentary material and allochthonous POC were inferred from the literature with average values of δ13CSED = -30.7 ‰, and δ13CExtPOC = -31.8 ‰. Comparison of DIC concentration gains and stable isotope mass balances showed that autochthonous POC from primary producers was the main contributor to DIC increases, while contributions from DOC, ExtPOC and SED played a minor role. OM turnover rates, i.e. the conversion of organic carbon towards DIC, calculated with our isotope approach were within the range for oligotrophic water bodies (0.01 to 1.3 µmol L-1 d-1). Some higher values in the metalimnion are likely due the availability of settling POC from the photic zone. Samples from a Metalimnetic Oxygen Minimum (MOM) showed a clear dominance of respiration over photosynthesis through bacterial degradation of autochthonous POC. These high turnover rates further highlight a close link with planktonic biological assemblages. Our work shows that respiration in temperate lentic water bodies largely depends on autochthonous POC production as a major carbon source.

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confidence: 73%

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confidence: 99%

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Mineralization of autochthonous particulate organic carbon is a fast channel of organic matter turnover in Germany’s largest drinking water reservoir

Dordoni

Seewald

Rinke

et al. 2022

Preprint

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“…For example, dissolved oxygen (DO) can hardly be exchanged between the different parts of the reservoir, and its concentrations are higher in the epilimnion due to biota developments in spring and summer and related photosynthetic production of O 2 (Wentzky et al, 2019). On the other hand, respiration dominates the metalimnion and hypolimnion of the reservoir to different degrees (Dordoni et al, 2022).…”

Section: Methodsmentioning

confidence: 99%

“…We also applied this approach to a metalimnetic oxygen minimum (MOM) in the reservoir. Here carbon turnover may be even more pronounced, as MOM is known for its strong depletion in dissolved oxygen (Shapiro, 1960;Nix, 1981;Kreling et al, 2017;Dordoni et al, 2022). The Rappbode Reservoir offered an ideal location for this study because in recent years its logistic settings helped to develop it into an increasingly acknowledged large-scale laboratory of ecological behavior for man-made lentic water bodies (Kong et al, 2019;Wentzky et al, 2019;Herzsprung et al, 2020;Mi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Mineralization of autochthonous particulate organic carbon is a fast channel of organic matter turnover in Germany's largest drinking water reservoir

et al. 2022

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Abstract. Turnover of organic matter (OM) is an essential ecological function in inland water bodies and relevant for water quality. This is especially important for the potential of dissolved organic carbon (DOC) removal as well as for emissions of CO2. In this study, we investigated various phases of OM including DOC, autochthonous particulate organic carbon (auto-POC), allochthonous particulate organic carbon (allo-POC), and sedimentary matter (SED) in a temperate drinking water reservoir (Rappbode Reservoir, Germany) by means of dissolved inorganic carbon (DIC) concentrations and carbon stable isotope ratios. In order to best outline carbon turnover, we focused on the metalimnion and the hypolimnion of the reservoir, where respiration is expected to be dominant and hardly disturbed by atmospheric exchange or photosynthesis. DIC concentrations ranged between 0.30 and 0.53 mmol L−1, while δ13CDIC values ranged between −15.1 ‰ and −7.2 ‰ versus the VPDB (Vienna PeeDee Belemnite) standard. Values of δ13CDOC and δ13Cauto-POC ranged between −28.8 ‰ and −27.6 ‰ and between −35.2 ‰ and −26.8 ‰, respectively. Isotope compositions of sedimentary material and allochthonous POC were inferred from the literature and from measurements from previous studies with δ13CSED=-31.1 ‰ and δ13Callo-POC ranging from −31.8 ‰ to −28.6 ‰. Comparison of DIC concentration gains and stable isotope mass balances showed that auto-POC from primary producers was the main contributor to increases in the DIC pool. Calculated OM turnover rates (0.01 to 1.3 µmol L−1 d−1) were within the range for oligotrophic water bodies. Some higher values in the metalimnion are likely due to increased availability of settling auto-POC from the photic zone. Samples from a metalimnetic oxygen minimum (MOM) also showed dominance of respiration over photosynthesis. Our work shows that respiration in temperate lentic water bodies largely depends on auto-POC production as a major carbon source. Such dependencies can influence the vulnerabilities of these aqueous systems.

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Ecological quality of snowmaking reservoirs in the Alps and management perspectives

Gerfand,

Arthaud,

Evette

et al. 2024

Aquat Sci

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Novel evaluations of sources and sinks of dissolved oxygen via stable isotopes in lentic water bodies

Cited by 11 publications

References 45 publications

Mineralization of autochthonous particulate organic carbon is a fast channel of organic matter turnover in Germany’s largest drinking water reservoir

Mineralization of autochthonous particulate organic carbon is a fast channel of organic matter turnover in Germany’s largest drinking water reservoir

Mineralization of autochthonous particulate organic carbon is a fast channel of organic matter turnover in Germany's largest drinking water reservoir

Ecological quality of snowmaking reservoirs in the Alps and management perspectives

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