Waterbird-Mediated Productivity of Two Soda Pans in the Carpathian Basin in Central Europe

Boros, Emil; Pigniczki, Csaba; Sápi, Tamás; Balogh, Katalin; Vörös, Lajos; Somogyi, Boglárka

doi:10.1675/063.039.0408

Cited by 20 publications

(26 citation statements)

References 23 publications

(16 reference statements)

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“…Residence of aquatic birds and algal blooms provide high nutrient supply (Boros et al 2008(Boros et al , 2016Somogyi et al 2009), which results in the high abundance of heterotrophic organisms (Vörös et al, 2008), such as members of phylum Bacteroidetes. These bacteria (especially from the order Flavobacteriales) favor to attach to organic particles and have high abundances in nutrient-rich habitats (Williams et al 2013), since they participate in the degradation of biopolymers, such as algae-derived particulate organic matter (Buchan et al 2014;Xing et al 2015).…”

Section: Metagenomic Overview Of Büdös-szék Soda Panmentioning

confidence: 99%

“…Sometimes dual blooms of green algae and purple bacteria can be observed (Borsodi et al 2013). Organic carbon and inorganic nitrogen and phosphorous derived from decaying plant material of the shoreline vegetation and from the excrements of aquatic birds (Boros et al 2008(Boros et al , 2016 provides the nutritional basis of the growth of both phototrophic and heterotrophic microorganisms. Taken together, shallowness, intermittent character (periodic desiccation), high turbidity, alkaline pH, polyhumic organic carbon concentration, hypertrophic condition and during summer high daily water temperature fluctuation create multiple extreme environmental conditions in these soda pans (Boros et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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Soda pans of the Pannonian steppe harbor unique bacterial communities adapted to multiple extreme conditions

et al. 2017

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Soda pans of the Pannonian steppe are unique environments regarding their physical and chemical characteristics: shallowness, high turbidity, intermittent character, alkaline pH, polyhumic organic carbon concentration, hypertrophic condition, moderately high salinity, sodium and carbonate ion dominance. The pans are highly productive environments with picophytoplankton predominance. Little is known about the planktonic bacterial communities inhabiting these aquatic habitats, therefore amplicon sequencing and shotgun metagenomics were applied to reveal their composition and functional properties. Results showed a taxonomically complex bacterial community which was distinct from other soda lakes regarding its composition, e.g. the dominance of class Alphaproteobacteria was observed within phylum Proteobacteria. The shotgun metagenomic analysis revealed several functional gene components related to the harsh and at the same time hypertrophic environmental conditions, e.g. proteins involved in stress response, transport and hydrolase systems targeting phytoplankton-derived organic matter. This is the first detailed report on the indigenous planktonic bacterial communities coping with the multiple extreme conditions present in the unique soda pans of the Pannonian steppe.

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Section: Metagenomic Overview Of Büdös-szék Soda Panmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Soda pans of the Pannonian steppe harbor unique bacterial communities adapted to multiple extreme conditions

et al. 2017

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“…Although the globally most abundant shallow lakes (Downing et al., 2006; Verpoorter, Kutser, Seekell, & Tranvik, 2014) have been shown to have double mean DOC concentration than deep lakes (6.56 and 3.12 mg/L, respectively) (Chen et al., 2015), the 90 mg/L mean DOC concentration of soda lakes can be considered as extreme even among highly productive aquatic systems such as eutrophic lakes, marshes, or bogs (Figure 1a). In addition, some single measurements of soda pans are very likely to represent the world record in DOC concentration as occasionally values close to 1 g/L have been reported (Lake Nakuru: 980 mg/L [Jirsa et al., 2013]; Sósér: 988 mg/L [Boros et al, 2016]) (Figure 1b).…”

Section: Introductionmentioning

confidence: 99%

Macrophytes and groundwater drive extremely high organic carbon concentration of soda pans

et al. 2020

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1. Endorheic soda pans are among the highest dissolved organic carbon (DOC) content aquatic systems on the planet with concentrations up to 1 g/L. Considering the importance of inland waters in the global carbon cycle, understanding the drivers of such outstanding organic carbon pools is eminent. The soda pans of the Carpathian Basin present a wide variability of biotic and abiotic characteristics that provide an adequate system to assess the determinants of extreme high DOC concentrations. Here, we demonstrate through a multi-site comparison, a multi-year seasonal monitoring, and a laboratory experiment that the dissolved organic matter content of the highest DOC concentration soda pans is primarily of groundwater and emergent macrophyte origin. 2. More precisely, the multi-site comparison of 14 soda pans revealed that variation of coloured dissolved organic matter (CDOM) content of the surface water of soda pans is partially explained by the CDOM content (22% of variation) of local groundwater, indicating the significant role of allochthonous terrestrial DOC sources. Further 23% of CDOM variation could be accounted for by Bolboschoenus maritimus species-specific emergent macrophyte cover, while the contribution of Phragmites australis cover was only minor. 3. In line with the results of the multi-site comparison, our decomposition experiment demonstrated that both B. maritimus and P. australis have the potential to release substantial amount of organic matter into soda pans. However, the organic matter release of B. maritimus leads to twice as high DOC and 3.5-times higher CDOM concentrations than P. australis. Considering previous organic matter release studies, we concluded that P. australis is a relatively low organic matter releaser emergent macrophyte, and therefore the species composition of emergent macrophytes has to be carefully considered in autochthonous plant-derived DOM estimations. 4. Finally, the multi-year seasonal monitoring of two distinctive soda pans showed that the high organic matter concentrations depend not only on their intrinsic characteristics but also on interannual variability. More precisely, we demonstrated that the highest CDOM and DOC concentrations that occurred in a coloured (i.e. brown, low total suspended solids) soda pan with extensive (95%) macrophyte cover dominated by B. maritimus were measured in a period characterised by high This is an open access article under the terms of the Creat ive Commo ns Attri bution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…These lakes exhibit a high turbidity caused by inorganic suspended particles and/or high humic substance content and frequently dry out during summer months [31]. Plant material of the shoreline vegetation and excrements of aquatic birds provide organic carbon and inorganic nitrogen and phosphorous inputs [33,34]. Taken together, shallowness, intermittent character (periodic desiccation), high turbidity, alkaline pH, polyhumic organic carbon concentration, hypertrophic conditions and during summer high daily water temperature fluctuation create multiple extreme environmental conditions in these lakes [35].…”

Section: Introductionmentioning

confidence: 99%

Exploring the upper pH limits of nitrite oxidation: diversity, ecophysiology, and adaptive traits of haloalkalitolerantNitrospira

Daebeler

Kitzinger

Koch

et al. 2020

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Nitrite-oxidizing bacteria of the genus Nitrospira are key players of the biogeochemical nitrogen cycle. However, little is known about their occurrence and survival strategies in extreme pH environments. Here, we report on the discovery of physiologically versatile, haloalkalitolerant Nitrospira that drive nitrite oxidation at exceptionally high pH. Nitrospira distribution, diversity, and ecophysiology were studied in hypo-and subsaline, highly alkaline (pH 8.9-10.3) lakes by amplicon sequencing, metagenomics, and cultivation-based approaches. Surprisingly, diverse Nitrospira populations from lineages I, II and IV were found. Furthermore, the ability of Nitrospira enrichment cultures to oxidize nitrite at neutral to highly alkaline pH of 10.5 was demonstrated. Metagenomic analysis of a newly enriched Nitrospira lineage IV species, "Candidatus Nitrospira alkalitolerans", revealed numerous adaptive features of this organism to its extreme environment. Among them were a sodiumdependent N-type ATPase and NADH:quinone oxidoreductase next to the proton-driven forms usually found in Nitrospira. Other functions aid in pH and cation homeostasis and osmotic stress defense. "Ca. Nitrospira alkalitolerans" also possesses group 2a and 3b [NiFe] hydrogenases, suggesting it can use hydrogen as alternative energy source. These results reveal how Nitrospira cope with strongly fluctuating pH and salinity conditions and expand our knowledge of nitrogen cycling in extreme habitats. 2 25 30 35 40 45 50 55 60 enrichments.

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Waterbird-Mediated Productivity of Two Soda Pans in the Carpathian Basin in Central Europe

Cited by 20 publications

References 23 publications

Soda pans of the Pannonian steppe harbor unique bacterial communities adapted to multiple extreme conditions

Soda pans of the Pannonian steppe harbor unique bacterial communities adapted to multiple extreme conditions

Macrophytes and groundwater drive extremely high organic carbon concentration of soda pans

Exploring the upper pH limits of nitrite oxidation: diversity, ecophysiology, and adaptive traits of haloalkalitolerantNitrospira

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