Spatial- and niche segregation of DCM-forming cyanobacteria in Lake Stechlin (Germany)

Selmeczy, Géza B.; Tapolczai, Kálmán; Casper, Peter; Krienitz, Lothar; Padisák, Judit

doi:10.1007/s10750-015-2282-5

Cited by 36 publications

(35 citation statements)

References 43 publications

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“…With the increase in depth and slightly more saline conditions, we observed a decrease in the abundance of Proteobacteria, which is consistent with previous studies showing the effects of these environmental variables on the abundance of this phylum (Holdridge 1960; Simon et al 1999; Cottrell and Kirchman 2003; Kirchman et al 2005; Kan et al 2008). The DCM was dominated by Cyanobacteria and particularly by the genus Cyanobium , which is consistent with previous observations in other oligotrophic lakes in Europe (Padisák et al 2003, 2004; Selmeczy et al 2016). Such a deep DCM could be the result of extremely high subsurface radiation and low nutrients, which is also concurrent with maximum values of oxygen and chlorophyll a.…”

Section: Discussionsupporting

confidence: 92%

Variation of bacterial communities along the vertical gradient in Lake Issyk Kul, Kyrgyzstan

Rojas-Jiménez

Araya-Lobo

Quesada-Perez

et al. 2019

Preprint

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30In this study, we explored the diversity and community composition of bacteria along a 31 vertical gradient in Lake Issyk Kul, Kyrgyzstan, one of the largest and deepest brackish lakes 32 in in the world. We identified 4904 bacterial ASVs based on analysis of 16S rRNA gene 33 sequences and determined significant changes in the composition responding mainly to the 34 variables depth and salinity. A higher abundance of Proteobacteria and Bacteroidetes was 35 observed in the surface waters and the lake tributaries. Cyanobacteria were more abundant in 36 the deep chlorophyll maximum (28.5 to 128 m), while Planctomycetes and Chloroflexi were 37 dominant at depths between 128 to 600 m. According to our machine learning analysis used 38 for identifying the most critical environmental factors, depth and temperature revealed the 39 strongest effect on members of Proteobacteria, Planctomycetes, and Chloroflexi, while 40 oxygen is associated with the variations in Cyanobacteria. Also, a notable increase in alpha 41 diversity estimations was observed with increasing water depth. This work evidences 42 significant differences in the structure of bacterial communities along the depth gradient in 43 deep, transparent lake ecosystems. Notably, there is a dominance of Planctomycetes and 44

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Section: Discussionsupporting

confidence: 92%

Variation of bacterial communities along the vertical gradient in Lake Issyk Kul, Kyrgyzstan

Rojas-Jiménez

Araya-Lobo

Quesada-Perez

et al. 2019

Preprint

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“…At the beginning of May 2013, a considerable proportion of Mediophyceae taxa were observed in the epilithic diatom samples due to the dominance of Stephanodiscus rugosus and Stephanodiscus neoastraea. Stephanodiscus species are considered to be among the most frequent diatoms in the spring phytoplankton bloom in Lake Stechlin (Padisák et al, 1998(Padisák et al, , 2003(Padisák et al, , 2010Selmeczy et al, 2016). Stephanodiscus minutulus was commonly observed in the phytoplankton of Lake Stechlin (Padisák et al, 1998(Padisák et al, , 2003.…”

Section: Resultsmentioning

confidence: 99%

“…Since 1994, a sampling program has been carried out to investigate the species composition and succession of phytoplankton (Padisák et al, 1998(Padisák et al, , 2010 and the occurrence of deep chlorophyll maxima (DCM) formed by cyanobacteria (Padisák et al, , 2010Selmeczy et al, 2016). In the last decade, an increasing abundance of cyanobacterial blooms indicated a change in water quality (Padisák et al, 2010;Üveges et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal patterns of benthic diatom flora in Lake Stechlin, Germany

Szabó¹,

Padisák²,

Selmeczy³

et al. 2017

Turk J Bot

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IntroductionThe Baltic Lake District in northeastern Germany is composed of a multitude of lakes originated during the last glacial period (~12,000 years before). Some of the lakes are pristine and considered to represent high status in terms of the European Water Framework Directive. Lake Stechlin represents a highly valuable ecosystem. It belongs to the type of stratified lowland lakes with small catchment area and high content of calcite (Mathes et al., 2002). It is one of the most extensively studied lakes in northern Germany. Regular monitoring of its main limnological variables and biota was set in the 1950s in the context of the operation of a nuclear power plant (NPP) between 1966 and 1989. Through an external circulation system, the NPP's cooling water was taken from Lake Nehmitz, the heated water was pumped into Lake Stechlin, and diverted back to Lake Nehmitz (Casper, 1985;Koschel et al., 2002).Phytoplankton of Lake Stechlin has been studied since 1959 (Casper, 1985), and water chemistry and primary production measurements using the 14 C-technique started in 1970 (Koschel, 1974). Since 1994, a sampling program has been carried out to investigate the species composition and succession of phytoplankton (Padisák et al., 1998(Padisák et al., , 2010 and the occurrence of deep chlorophyll maxima (DCM) formed by cyanobacteria (Padisák et al., 1997(Padisák et al., , 2010Selmeczy et al., 2016). In the last decade, an increasing abundance of cyanobacterial blooms indicated a change in water quality (Padisák et al., 2010;Üveges et al., 2012).Diatom research in Lake Stechlin focused mainly on planktonic Centrales taxa. The population dynamics of two phycogeographically restricted unicellular diatom species were described (Cyclotella tripartita and Stephanocostis chantaicus -Scheffler and Padisák, , 2000. In 1999, spatial and temporal changes in spring planktonic diatom populations were studied (Padisák et al., 2003). Scheffler et al. ( , 2005 investigated the relationship between Cyclotella comensis and Cyclotella pseudocomensis with morphological, ecological, and molecular methods. Contrary to extensive and detailed phytoplankton studies, attached diatoms of the lake received much less scientific interest. In 1974 and 1975 (thermal load period), biomass and primary production of periphyton in the littoral zone were determined. Thereafter, a list of diatom taxa found in the probes was compiled and published in Casper's (1985) synthesis. Scheffler and Schönfelder (2004) reported the Abstract: Phytoplankton and planktonic centric diatoms of Lake Stechlin have been extensively studied, while attached diatoms have received much less scientific interest. In the present study, the composition of benthic diatoms and their diversity metrics were determined and compared along the shoreline of the lake in spring 2013 and autumn 2014. Overall, 118 taxa classified in 52 genera were found, of which 15 species belonged to threat categories of the Red List for Central Europe. Species richness (33 ± 4), Shannon diversity (2.47 ± ...

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“…In some of summer months in 2010 and 2011 an increase of Chl-a content was stated at a depth of 5 m up to 72 µg·L −1 , while the amount of the pigment in the subsurface water layer was several times lower. This phenomenon is known as the deep chlorophyll maximum (DCM), which is characteristic of mesotrophic lakes [48]. Phytoplankton grows intensively in the metalimnion or even in the upper part of the hypolimnion due to the higher nutrient content, more so than in the epilimnetic zone.…”

Section: Discussionmentioning

confidence: 99%

Changes in Phytoplankton and Water Quality during Sustainable Restoration of an Urban Lake Used for Recreation and Water Supply

Kozák

Gołdyn

Dondajewska

et al. 2017

Water

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Abstract:Groundwater intake near Lake Głębokie, situated in the city of Szczecin in Northwestern Poland, resulted in a distinct decrease in the lake water level. Water intake from a river and a neighboring urban area led to eutrophication and a strong cyanobacterial water bloom. Both the water intake and recreation were threatened due to the possible influence of cyanobacterial toxins. The lake was subjected to three sustainable restoration methods: aeration of sediment-water; iron addition to precipitate P, and; biomanipulation. The goal of our study was to determine the changes in the taxonomic composition of phytoplankton and chemical water variables during restoration measures. A comparison of the data obtained during this research with the pre-restoration data showed that, as a result of the treatments orthophosphates decreased, rarely exceeding 0.06 mg P·L −1 , and cyanobacterial water blooms disappeared. Cyanobacteria were found in the lake but they were not abundant. Chrysophytes and diatoms were the most abundant in springtime of each year. Green algae, desmids and chrysophytes were particularly abundant in summer, while cryptophytes predominated in autumn. Algae from all these groups do not pose a threat to either recreation or water intake. The deep chlorophyll maximum occurring in summer at a depth of 5 m as a result of restoration confirms the lower trophic status of the lake, alluding to mesotrophic conditions.

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Spatial- and niche segregation of DCM-forming cyanobacteria in Lake Stechlin (Germany)

Cited by 36 publications

References 43 publications

Variation of bacterial communities along the vertical gradient in Lake Issyk Kul, Kyrgyzstan

Variation of bacterial communities along the vertical gradient in Lake Issyk Kul, Kyrgyzstan

Spatial and temporal patterns of benthic diatom flora in Lake Stechlin, Germany

Changes in Phytoplankton and Water Quality during Sustainable Restoration of an Urban Lake Used for Recreation and Water Supply

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