Lability of organic carbon in lakes of different trophic status

Ostapenia, A.; Parparov, Arkadi; Berman, T.

doi:10.1111/j.1365-2427.2009.02183.x

Cited by 39 publications

(22 citation statements)

References 26 publications

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“…Supersaturation with dissolved oxygen, observed during the intense vegetation season in the surface water layer about 2 m thick, indicates high primary production. This is confirmed by an analysis of the dependence of dissolved oxygen concentration (DOC) on chlorophyll a, which is an indicator of the level of primary production (Canuel and Zimmerman 1999;Ostapenia et al 2009). In the case of this lake, a statistically significant proportional correlation between DOC and chlorophyll a content (Fig.…”

Section: Discussion Of Resultsmentioning

confidence: 77%

Oxygen conditions and trophic state of Lake Głębokie (Szczecin, Poland) in the years 2008-2010

Nędzarek

Tórz

Kubiak

2010

Limnological Review

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Oxygen conditions and trophic state of Lake Głębokie (Szczecin, Poland) in the years 2008-2010The research in Lake Głębokie was conducted in the years 2008-2010. Sampling from three selected sites was designed in such a way that vertical profiles of the characteristics of interest were obtained. Measurements were performed to determine the content of dissolved oxygen, oxygen saturation expressed as a percentage, water temperature, total phosphorus, chlorophyll a, dry seston mass, and Secchi disk depth. During the course of a year, water temperature varied from 0.58°C to 24.72°C. However, a permanent thermal stratification was not observed in the summer season due to complete water mixing. Dissolved oxygen concentrations in the water varied within a range that started at hard-to-measure insignificant values and reached up to 9.63 mg O2 l-1, while oxygen saturation reached a maximum of 116% O2. At the same time, it was observed that oxygen conditions gradually worsened as the depth became greater. The largest oxygen deficits occurred in the winter season of 2009-2010. The oxygen conditions were typical for an eutrophic lake. Its high trophic state was confirmed by an analysis performed using the method proposed by Carlson (1977) as well as by an analysis performed according to the directives of the OECD (1982). The trophic state of this lake is borderline eutrophic and hypertrophic. The oxygen conditions found in this lake ought to be seen as not beneficial to fish.

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Section: Discussion Of Resultsmentioning

confidence: 77%

Oxygen conditions and trophic state of Lake Głębokie (Szczecin, Poland) in the years 2008-2010

Nędzarek

Tórz

Kubiak

2010

Limnological Review

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“…These patterns are contrary to studies from boreal lakes, which tend to show that DOC mineralization increases pCO 2 and reduces pH (Balmer & Downing, ). Although speculative, the observed positive relationship between pH and DOC may reflect recalcitrant DOC, which is not respired (Ostapenia et al, ), autochthonously derived DOC during high primary production (Søndergaard et al, ), and/or a positive correlation between DOC and nutrient influx (Osburn et al, ). The latter two are most likely given the positive correlation between TDN and DOC in our study lakes; however, further research is required to distinguish among these explanations.…”

Section: Discussionmentioning

confidence: 99%

Generalized Additive Models of Climatic and Metabolic Controls of Subannual Variation in pCO₂ in Productive Hardwater Lakes

et al. 2018

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Spatiotemporal variation in climate and weather, allochthonous carbon loads, and autochthonous factors such as lake metabolism (photosynthesis and respiration) interacts to regulate atmospheric CO2 exchange of lakes. Understanding this interplay in diverse basin types at different timescales is required to adequately place lakes into the global carbon cycle and predict CO2 flux through space and time. We analyzed 18 years of data from seven moderately hard lakes in an agricultural prairie landscape in central Canada. We applied generalized additive models and sensitivity analyses to evaluate the roles of metabolic and climatic drivers in regulating CO2 flux at the intra‐annual scale. At mean conditions with respect to other predictors, metabolic controls resulted in uptake of atmospheric CO2 when surface waters exhibited moderate primary production but released CO2 only when primary production was very low (<8 μg/L or when dissolved nitrogen was elevated (>2,000 μg/L), implying that respiratory controls offset photosynthetic CO2 uptake under these conditions. Climatically, dry conditions increased the likelihood of in‐gassing, likely due to evaporative concentration of base cations and/or reduced allochthonous carbon loads. While more research is required to establish the relative importance of climate and metabolism at other timescales (diel, autumn/winter), we conclude that these hard fresh waters characteristic of continental interiors are mainly affected by metabolic drivers of pCO2 at daily‐monthly timescales, are climatically controlled at interannual intervals, and are more likely to in‐gas CO2 for a given level of algal abundance than are soft water, boreal ecosystems.

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“…These results confirm previous work suggesting that algal DOC is a preferred substrate for bacteria [ Kritzberg et al ., ; Kritzberg et al ., ; McCallister et al ., ] and suggest that algal DOC is a major component of the highly reactive pool within bulk DOC. The amount of C that can be extracted from bulk DOC by bacteria has been shown to also increase with lake trophy [ Ostapenia et al ., ], suggesting that as the relative proportion of algal versus terrestrial DOC increases, the amount of labile C within bulk DOC also increases. Our results provide evidence for the mechanistic underpinning to this pattern, by showing that the amount of algal DOC that can be utilized by bacteria actually increases as a function of lake productivity (Figure a), thus potentially driving the overall DOC lability.…”

Section: Discussionmentioning

confidence: 99%

Differentiating the degradation dynamics of algal and terrestrial carbon within complex natural dissolved organic carbon in temperate lakes

2013

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[1] It has often been hypothesized that the dissolved organic carbon (DOC) pool of algal origin in lakes is more bioavailable than its terrestrial counterpart, but this hypothesis has seldom been directly tested. Here we test this hypothesis by tracking the production and isotopic signature of bacterial respiratory CO 2 in 2 week lake water incubations and use the resulting data to reconstruct and model the bacterial consumption dynamics of algal and terrestrial DOC. The proportion of algal DOC respired decreased systematically over time in all experiments, suggesting a rapid consumption and depletion of this substrate. Our results further show that the algal DOC pool was used in proportions and at rates twice and 10 times as high as the terrestrial DOC pool, respectively. On the other hand, the absolute amount of labile terrestrial DOC was on average four times higher than labile algal DOC, accounting for almost the entire long-term residual C metabolism, but also contributing to short-term bacterial C consumption. The absolute amount of labile algal DOC increased with chlorophyll a concentrations, whereas total phosphorus appeared to enhance the amount of terrestrial DOC that bacteria could consume, suggesting that the degradation of these pools is not solely governed by their respective chemical properties, but also by interactions with nutrients. Our study shows that there is a highly reactive pool of terrestrial DOC that is processed in parallel to algal DOC, and because of interactions with nutrients, terrestrial DOC likely supports high levels of bacterial metabolism and CO 2 production even in more productive lakes.Citation: Guillemette, F., S. L. McCallister, and P. A. del Giorgio (2013), Differentiating the degradation dynamics of algal and terrestrial carbon within complex natural dissolved organic carbon in temperate lakes, J. Geophys. Res.

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Lability of organic carbon in lakes of different trophic status

Cited by 39 publications

References 26 publications

Oxygen conditions and trophic state of Lake Głębokie (Szczecin, Poland) in the years 2008-2010

Oxygen conditions and trophic state of Lake Głębokie (Szczecin, Poland) in the years 2008-2010

Generalized Additive Models of Climatic and Metabolic Controls of Subannual Variation in pCO₂ in Productive Hardwater Lakes

Differentiating the degradation dynamics of algal and terrestrial carbon within complex natural dissolved organic carbon in temperate lakes

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Lability of organic carbon in lakes of different trophic status

Cited by 39 publications

References 26 publications

Oxygen conditions and trophic state of Lake Głębokie (Szczecin, Poland) in the years 2008-2010

Oxygen conditions and trophic state of Lake Głębokie (Szczecin, Poland) in the years 2008-2010

Generalized Additive Models of Climatic and Metabolic Controls of Subannual Variation in pCO2 in Productive Hardwater Lakes

Differentiating the degradation dynamics of algal and terrestrial carbon within complex natural dissolved organic carbon in temperate lakes

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Generalized Additive Models of Climatic and Metabolic Controls of Subannual Variation in pCO₂ in Productive Hardwater Lakes