Internal phosphorus loading across a cascade of three eutrophic basins: A synthesis of short- and long-term studies

Tammeorg, Olga; Horppila, Jukka; Tammeorg, Priit; Haldna, Marina; Niemistö, Juha

doi:10.1016/j.scitotenv.2016.07.224

Cited by 34 publications

(14 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In late summer, the abundance of cyanobacteria was primarily associated with the concentration of SRP ( Figure 7) in Lake Peipsi s.s., suggesting that the dominance of cyanobacteria and biomass of the major microcystin producer is mainly controlled by P dynamics. Similarly, the recent studies in Lake Peipsi and other shallow eutrophic lakes of the north temperate region have shown that internal P loading provides considerable amounts of bioavailable P to the water column, which contributes to the growth of cyanobacteria in summer [48,[55][56][57][58][59]. Under turbid conditions and warm water temperatures, cyanobacteria gain an advantage over eukaryotic phytoplankton groups, as they can control their buoyancy to maximise the light use, maintain growth rates in warmer temperatures, fix atmospheric nitrogen, and therefore take advantage of the use that is provided by internal loading during N-limited periods [28,60].…”

Section: Discussionmentioning

confidence: 88%

“…Microscopic analysis of the samples was conducted to analyse the cyanobacterial community composition. Although several studies on the occurrence of cyanobacteria in Lake Peipsi have been published [41,44,[46][47][48][49], only one of these addresses the issue of toxicity and toxin concentrations [49]. In general, there are significantly less data and fewer studies on cyanotoxins from Eastern Europe, with Estonia being presented with only one publication [50].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Using Microcystin Gene Copies to Determine Potentially-Toxic Blooms, Example from a Shallow Eutrophic Lake Peipsi

Panksep

Tamm

Mantzouki

et al. 2020

Toxins

Self Cite

View full text Add to dashboard Cite

Global warming, paired with eutrophication processes, is shifting phytoplankton communities towards the dominance of bloom-forming and potentially toxic cyanobacteria. The ecosystems of shallow lakes are especially vulnerable to these changes. Traditional monitoring via microscopy is not able to quantify the dynamics of toxin-producing cyanobacteria on a proper spatio-temporal scale. Molecular tools are highly sensitive and can be useful as an early warning tool for lake managers. We quantified the potential microcystin (MC) producers in Lake Peipsi using microscopy and quantitative polymerase chain reaction (qPCR) and analysed the relationship between the abundance of the mcyE genes, MC concentration, MC variants and toxin quota per mcyE gene. We also linked environmental factors to the cyanobacteria community composition. In Lake Peipsi, we found rather moderate MC concentrations, but microcystins and microcystin-producing cyanobacteria were widespread across the lake. Nitrate (NO3−) was a main driver behind the cyanobacterial community at the beginning of the growing season, while in late summer it was primarily associated with the soluble reactive phosphorus (SRP) concentration. A positive relationship was found between the MC quota per mcyE gene and water temperature. The most abundant variant—MC-RR—was associated with MC quota per mcyE gene, while other MC variants did not show any significant impact.

show abstract

Section: Discussionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Using Microcystin Gene Copies to Determine Potentially-Toxic Blooms, Example from a Shallow Eutrophic Lake Peipsi

Panksep

Tamm

Mantzouki

et al. 2020

Toxins

Self Cite

View full text Add to dashboard Cite

show abstract

“…Furthermore, it is very likely that considerable implications for surface water quality are achieved through complex interactions of P release from anoxic sediment with other mechanisms including those of aerobic release in shallow areas. For example, sediment resuspension may considerably promote the release of P also from anoxic sediment by increasing the P concentration gradient between the sediment and overlying water column and by mixing P enriched pore-water into the overlying water (Reddy et al 1996;Tammeorg et al 2016). The importance of other mechanisms, like ligand-exchange reactions, desorption from sediment particles, bioturbation cannot be ignored (Holmroos et al 2009;Niemistö et al 2012;Tammeorg et al 2015).…”

Section: Discussionmentioning

confidence: 99%

“…However, this mechanism may lessen over diel and seasonal cycles especially in enriched systems, turning shallow sediments to an important P source (Smith et al 2011). Moreover, even this well-oxidized sediment surface does not preclude the potential release of mobile P to the overlying water column due to existing gradients with high porewater concentrations compared to low P concentrations in the overlying water and sediment disturbances (Tammeorg et al 2015(Tammeorg et al , 2016. The relevance of the problem is particularly high given that deep stratifying lakes may also have extensive shallow areas.…”

Section: Introductionmentioning

confidence: 99%

Internal phosphorus loading due to sediment anoxia in shallow areas: implications for lake aeration treatments

Tammeorg

Nürnberg²,

Niemistö

et al. 2020

Aquat Sci

Self Cite

View full text Add to dashboard Cite

Shallow lake sediments may be anoxic despite overlying aerated water. In the current study, we aimed to ascertain the contribution of shallow areas to internal phosphorus (P) loading due to sediment anoxia in stratifying lakes. Moreover, we analyzed relationships of the key water quality variables with internal P loading due to sediment anoxia originating solely from stratifying areas (IP obs) and that accounting also for the shallow areas (IP pred) for a set of Finnish lakes, including intentionally aerated and non-aerated lakes. Finally, using a broader set of lakes worldwide, we established a specific combination of lake characteristics that predict sediment P release due to sediment anoxia and linked it to the practices of aeration. Our results showed that shallow lake areas (a difference between IP pred and IP obs) contributed about half of the total P flux due to sediment anoxia. While all of the studied water quality variables related significantly to IP pred , only the concentration of total phosphorus (TP) in the near-bottom water layer related significantly to IP obs. This indicates the key importance of P release of shallow areas for water quality. The concentrations of TP in the surface water layer and chlorophyll a were significantly dependent on IP pred irrespectively of the treatment (aerated lakes or not). P supply from shallow areas may affect aeration effectiveness in stratifying lakes. IP pred was found to be dependent on the specific combination of lake characteristics (including mean and maximum depth, lake and catchment area, external P loading) PC3, driven mainly by external P loading. Hence, external load reduction should be considered as the first priority in lake water quality management. By linking the dependence of IP pred on PC3 to aeration practices, we determined the conditions that promise increased effectiveness of aeration treatments.

show abstract

“…Climate change can affect P retention via variations in air temperature and precipitation that both influence P transport to the lakes (Jeppesen et al 2009;Pettersson et al 2010). Additionally, changes in temperature and wind have considerable implications for the vertical transport of P in lakes (Spears and Jones 2010;Tammeorg et al 2013;Tammeorg et al 2016, Woolway et al 2017. Generally, climate change is associated with increased net P accumulation in lakes due to enhanced external nutrient loading leading also to increased internal P loading .…”

Section: Introductionmentioning

confidence: 99%

Factors behind the variability of phosphorus accumulation in Finnish lakes

et al. 2018

Self Cite

View full text Add to dashboard Cite

Purpose. Phosphorus retention (TPacc) is one of the major water quality regulators in lakes. The current study aimed at ascertaining the specific lake characteristics regulating TPacc. Moreover, we were interested whether NAO (North Atlantic Oscillation), a proxy of climatic forcing, can explain variability in TPacc, additionally to that ascribed to lake characteristics. Materials and methods. Sediment cores were obtained from 21 Finnish lakes, subject to radiometric dating and measurements of TP concentrations. Principal components (PCs) were generated using lake characteristics that are usually included into the modelling of TPacc (e.g., lake area, lake depth, catchment area, P inflow), but also the parameters that the classical models usually missed (e.g., anoxic factor). We used significant principal components (PCs), specific combinations of lake characteristics and monthly NAO values as predictors of TPacc. Results and discussion. Lake characteristics explained the bulk of TPacc variability. The most influential factors (positive drivers) behind TPacc included PC1 (representing mainly deep lakes), PC2 (small lakes with high levels of anoxia and water column stability), PC3 (productive lakes, with large catchment area and short water residence time), PC4 (lakes with high water column stability, low anoxic factor, and relatively high sediment focusing), and PC5 (lakes with high levels of P inflow, anoxia and long water residence time). Additionally, we found a potential negative effect of NAO in October on the annual TPacc. This NAO was significantly positively related to temperatures in surface and near-bottom water layer (also their difference) in autumn, suggesting the possible implications for the internal P dynamics. Increased mineralization of organic matter is the most likely explanation for the reduced TPacc associated with NAO driven water temperature increase. Conclusions. The analysis presented here contributes to the knowledge of the factors controlling P retention. Moreover, this spatially and temporally comprehensive sediment data can potentially be a valuable source for modelling climate change implications.

show abstract

Internal phosphorus loading across a cascade of three eutrophic basins: A synthesis of short- and long-term studies

Cited by 34 publications

References 53 publications

Using Microcystin Gene Copies to Determine Potentially-Toxic Blooms, Example from a Shallow Eutrophic Lake Peipsi

Using Microcystin Gene Copies to Determine Potentially-Toxic Blooms, Example from a Shallow Eutrophic Lake Peipsi

Internal phosphorus loading due to sediment anoxia in shallow areas: implications for lake aeration treatments

Factors behind the variability of phosphorus accumulation in Finnish lakes

Contact Info

Product

Resources

About