Dilemma of Non‐Steady State in Lakes – Development and Predictability of In‐Lake P Concentration in Dimictic Lake Scharmützelsee (Germany) after Abrupt Load Reduction

Grüneberg, Björn; Rücker, Jacqueline; Nixdorf, Brigitte; Behrendt, Horst

doi:10.1002/iroh.201111287

Cited by 18 publications

(25 citation statements)

References 38 publications

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“…For example, Nostocales in our microcosms attained biovolumes after 6 days of P addition that far exceeded those normally observed under natural conditions, where other factors may limit the response of phytoplankton to nutrient pulses. Several factors and processes in a natural lake may influence the absolute and relative supplies of N and P, such as N 2 ‐fixation (Howarth, Marino, Lane, & Cole, ), denitrification (Downing & McCauley, ; Seitzinger et al, ), nutrient recycling in the sediments (Grüneberg, Rücker, Nixdorf, & Behrendt, ; Holmroos, Hietanen, Niemistö, & Horppila, ; Welch & Cooke, ), atmospheric deposition (Bergström, Blomqvist, & Jansson, ; Elser, Kyle, Steger, Nydick, & Baron, ), and land use in the catchment area (Downing & McCauley, ; Vanni, Renwick, Bowling, Horgan, & Christian, ). Therefore, it is possible that the short‐term limitations observed here may be overcome by larger‐scale processes (Sterner et al, ).…”

Section: Discussionmentioning

confidence: 99%

The response of nitrogen fixing cyanobacteria to a reduction in nitrogen loading

Kolzau

Dolman

Voß

et al. 2018

Internat Rev Hydrobiol

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Due to their competitive advantage when inorganic nitrogen (N) sources are scarce, it is widely assumed that the abundance and N2‐fixation rate of N2‐fixing cyanobacteria (Nostocales) would increase in response to reduced N loading. If realized, this response would render efforts to improve water quality by N reduction ineffective. To assess this, we performed a microcosm experiment using water from an N limited lake, Langer See, in which phosphorus loading was held constant, while a gradient of decreasing N loading was simulated. Nostocales biovolume increased over time in all microcosms, regardless of the N addition rate, so that no difference in Nostocales biovolume developed between high and low N microcosms. In contrast, the biovolumes of other taxa (especially non‐fixing cyanobacteria) were lower at low N addition rates. N2‐fixation increased in low N microcosms, compensating for 36% of the difference in N addition by day 6. However, this compensation rate was achieved at Nostocales biovolumes far higher than those typical in the studied lake. At biovolumes typical for summer the compensation rate would only account for 7% of the omitted N. If these results were to hold over longer time scales, in shallow polymictic lakes like Langer See, reduced N loading may lower both in‐lake N concentrations and biovolumes of non‐fixing phytoplankton without significantly impacting Nostocales biovolume.

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Section: Discussionmentioning

confidence: 99%

The response of nitrogen fixing cyanobacteria to a reduction in nitrogen loading

Kolzau

Dolman

Voß

et al. 2018

Internat Rev Hydrobiol

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“…The main characteristics of the lakes are shown in Table 1; for more detailed information see Grüneberg et al [28], Nixdorf and Deneke [29], Köhler et al [30] and Knösche [31].…”

Section: Methodsmentioning

confidence: 99%

Seasonal Patterns of Nitrogen and Phosphorus Limitation in Four German Lakes and the Predictability of Limitation Status from Ambient Nutrient Concentrations

et al. 2014

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To identify the seasonal pattern of nitrogen (N) and phosphorus (P) limitation of phytoplankton in four different lakes, biweekly experiments were conducted from the end of March to September 2011. Lake water samples were enriched with N, P or both nutrients and incubated under two different light intensities. Chlorophyll a fluorescence (Chla) was measured and a model selection procedure was used to assign bioassay outcomes to different limitation categories. N and P were both limiting at some point. For the shallow lakes there was a trend from P limitation in spring to N or light limitation later in the year, while the deep lake remained predominantly P limited. To determine the ability of in-lake N:P ratios to predict the relative strength of N vs. P limitation, three separate regression models were fit with the log-transformed ratio of Chla of the P and N treatments (Response ratio = RR) as the response variable and those of ambient total phosphorus:total nitrogen (TN:TP), dissolved inorganic nitrogen:soluble reactive phosphorus (DIN:SRP), TN:SRP and DIN:TP mass ratios as predictors. All four N:P ratios had significant positive relationships with RR, such that high N:P ratios were associated with P limitation and low N:P ratios with N limitation. The TN:TP and DIN:TP ratios performed better than the DIN:SRP and TN:SRP in terms of misclassification rate and the DIN:TP ratio had the highest R2 value. Nitrogen limitation was predictable, frequent and persistent, suggesting that nitrogen reduction could play a role in water quality management. However, there is still uncertainty about the efficacy of N restriction to control populations of N2 fixing cyanobacteria.

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“…1). It is of glacial origin and has an elongated shape (1.5 km wide and 10 km long) with a mean depth of 8.9 m and a maximum depth of 29.5 m. A more detailed description of the lake is provided by Grü neberg et al (2011). The dimictic lake develops an anoxic hypolimnion during summer stratification (Kleeberg 1997).…”

Section: Methodsmentioning

confidence: 99%

Physical controls of oxygen fluxes at pelagic and benthic oxyclines in a lake

Kreling

Bravidor

Mcginnis

et al. 2014

Limnology & Oceanography

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We compared oxygen fluxes measured simultaneously at the pelagic and benthic oxycline in a lake and analyze their relation to hydrodynamic forcing conditions. While the mean oxygen fluxes did not differ significantly among both sites, the fluxes were highly variable in time. Short energetic periods contributed disproportionately to the overall oxygen flux above both the benthic and pelagic oxycline. In the pelagic region, mean fluxes across the oxycline were limited by low diffusivities (7 3 10 28 m 2 s 21 ) and were one to two orders of magnitude smaller than fluxes above the oxycline (0.5 and 32 mmol m 22 d 21 , respectively). A one-dimensional transport model was used to estimate sources and sinks of oxygen potentially causing this imbalance. The model results indicate that 92% of dissolved oxygen transported into the oxycline is used by the respiration of organic material imported into the oxycline from the epilimnion; chemical oxygen consumption associated with the upward flux of reduced substances is negligible. Our findings indicate that under such conditions, dissolved oxygen consumption and therewith mineralization within the oxycline can be comparable with the corresponding rates occurring in the sediments of eutrophic lakes with an oxic hypolimnion.Anoxic conditions prevail in bottom waters of many stratified water bodies like lakes, reservoirs, and oceans. These conditions arise from an imbalance in the biogeochemical uptake and downward vertical transport of dissolved oxygen (DO), which can result from eutrophication (Wetzel 2001) and/or limited vertical mixing (Boehrer and Schultze 2008). While the former enhances the input of organic matter to the bottom waters and leads to an increased DO demand, the latter restricts downward fluxes and oxygen replenishment. Deep-water DO can be depleted either temporarily, during the seasonal cycle of density stratification (Turner and Erskine 2005), or permanently if meromixis inhibits seasonal mixing (Rodrigo et al. 2001). The so-called oxycline forms at the boundary between oxic surface waters and anoxic bottom waters. We define the oxycline as the layer ranging from the depth where the DO is 62.5 mmol L 21 to the depth where the DO becomes 0 mmol L 21 ; it is congruent with the hypoxic zone. Pelagic oxyclines exhibit strong vertical gradients not only in dissolved substances, but also in biodiversity and ecosystem functioning. The lack of DO results in drastic habitat alterations (Zhang et al. 2009) and affects chemical cycling (Davison 1981). Inland water bodies are likely to be more susceptible to anoxia more frequently in the future since climate warming leads to longer stratification periods and thereby promotes the additional formation and persistence of anoxic conditions (Adrian et al. 1995;Livingstone 2003;Foley et al. 2012). Therefore, a process-based understanding of vertical oxygen transport between the oxic surface water and anoxic bottom layers becomes increasingly important. From a physical point of view, the transport across the oxyclin...

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Dilemma of Non‐Steady State in Lakes – Development and Predictability of In‐Lake P Concentration in Dimictic Lake Scharmützelsee (Germany) after Abrupt Load Reduction

Cited by 18 publications

References 38 publications

The response of nitrogen fixing cyanobacteria to a reduction in nitrogen loading

The response of nitrogen fixing cyanobacteria to a reduction in nitrogen loading

Seasonal Patterns of Nitrogen and Phosphorus Limitation in Four German Lakes and the Predictability of Limitation Status from Ambient Nutrient Concentrations

Physical controls of oxygen fluxes at pelagic and benthic oxyclines in a lake

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