Community dynamics and function of algae and bacteria during winter in central European great lakes

Bullerjahn, George S.; McKay, R. Michael L.; Bernát, Gábor; Prášil, Ondřej; Vörös, Lajos; Pálffy, Károly; Tugyi, Nóra; Somogyi, Boglárka

doi:10.1016/j.jglr.2019.07.002

Cited by 23 publications

(21 citation statements)

References 31 publications

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“…During the time of sampling, the water temperature was 11.5°C, and the lake was not ice covered (25). Strains from Hungary were obtained from Lake Balaton, which is in the Transdanubian region and is the largest lake in central Europe; it has a surface area of 596 km 2 and a mean depth of 3.2 m. During sampling, the lake was covered by thin ice (2 to 5 cm) with negligible snow cover, and the water temperature was 3.5°C (26). env-Ps from Germany were obtained from the Darss-Zingst estuary in the state of Mecklenburg-West Pomerania, which represents a brackish habitat and had a temperature of 4.0°C.…”

Section: Resultsmentioning

confidence: 99%

Loci Encoding Compounds Potentially Active against Drug-Resistant Pathogens amidst a Decreasing Pool of Novel Antibiotics

Basalla

Chatterjee

Burgess

et al. 2019

Appl Environ Microbiol

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Carbapenem-resistant P. aeruginosa is difficult to treat and has been deemed by the World Health Organization as a priority one pathogen for which antibiotics are most urgently needed. Although metagenomics and bioinformatic studies suggest that natural bacteria remain a source of novel compounds, the identification of genes and their products specific to activity against MDR pathogens remains problematic. Here, we examine water-derived pseudomonads and identify gene clusters whose compounds inhibit CF-derived MDR pathogens, including carbapenem-resistant P. aeruginosa.

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Section: Resultsmentioning

confidence: 99%

Loci Encoding Compounds Potentially Active against Drug-Resistant Pathogens amidst a Decreasing Pool of Novel Antibiotics

Basalla

Chatterjee

Burgess

et al. 2019

Appl Environ Microbiol

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“…This seasonality is usually much more prominent in the western basin as compared to the eastern one. In winter, phytoplankton is usually dominated by EuAPP, small flagellates and green algae (Vörös et al 2009;Dokulil et al 2014;Somogyi et al 2016;Bullerjahn et al 2019).…”

Section: Physical and Chemical Environment In Lake Balatonmentioning

confidence: 99%

Photoautotrophic picoplankton – a review on their occurrence, role and diversity in Lake Balaton

et al. 2020

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Occurrence of the smallest phototrophic microorganisms (photoautotrophic picoplankton, APP) in Lake Balaton was discovered in the early 1980s. This triggered a series of systematic studies on APP and resulted in the setting of a unique long-term picoplankton dataset. In this review, we intend to summarize the obtained results and to give a new insight on APP ecology and diversity in Lake Balaton. According to the results, APP dynamics depends on trophic state, temperature, nutrient, and light availability, as well as grazing pressure. APP abundance in Lake Balaton decreased to a low level (1-2 × 10 5 cells mL −1) as a consequence of decreasing nutrient supply (oligotrophication) during the past more than two decades, and followed a characteristic seasonal dynamics with higher abundance values from spring to autumn than in winter. Concomitantly, however, the APP contribution to both phytoplankton biomass and primary production increased (up to 70% and 40-50%, respectively) during oligotrophication. Regarding annual pattern, picocyanobacteria are dominant from spring to autumn, while in winter, picoeukaryotes are the most abundant, most likely due to the different light and temperature optima of these groups. Within picocyanobacteria, single cells and microcolonies were both observed with midsummer dominance of the latter which correlated well with the density of cladocerans. Community-level chromatic adaptation (i.e., dominance of phycoerythrin-or phycocyanin-rich forms) of planktonic picocyanobacteria was also found as a function of underwater light quality. Sequence analysis studies of APP in Lake Balaton revealed that both picocyanobacteria and picoeukaryotes represent a diverse and dynamic community consisting several freshwater genotypes

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“…Thus, phytoplankton in reservoirs are affected when the temperature of winter is the lowest of the whole year. Bullerjahn et al [53] investigated the dynamics and functional roles of algal and bacterial communities during winter in two seasonally ice-covered central European Great Lakes, observing that the algal biomasses of the two lakes during winter were lower than its means during a long-term summer. Diatoms, green algae, cryptophytes and chrysoflagellates were the dominant groups of algal communities, accounting for the majority of algal biomass.…”

Section: Shifts In Algal Cell Concentration and Chlorophyll Amentioning

confidence: 99%

“…The reservoirs showed an apparent switch from a Chlorophyta-dominated state to a Bacillariophyta taxa-dominated state. In winter, picoeukaryotes, such as common members of diatoms, green algae, and small flagellates, usually dominate the phytoplankton community [53]. Diatoms are common species in all kinds of fresh-water bodies, and widely exist in rivers, reservoirs, and lakes [54].…”

Section: Phytoplankton Dynamics and Community Structurementioning

confidence: 99%

“…Moreover, the impact of the disturbances varied in the taxon and organizational levels. However, Bullerjahn et al [53] recently observed that winter phytoplankton communities in ice fractions were photo-synthetically active. Additionally, the similarities of ice-derived microbial communities in these two totally different lakes suggest that the conditions for ice formation chose common community compositions.…”

Section: Effect Of the Environmental Factors On Communitiesmentioning

confidence: 99%

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Community Compositions of Phytoplankton and Eukaryotes during the Mixing Periods of a Drinking Water Reservoir: Dynamics and Interactions

Yan

Chen

Huang

et al. 2020

IJERPH

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In deep drinking water reservoir ecosystems, the dynamics and interactions of community compositions of phytoplankton and eukaryotes during the mixing periods are still unclear. Here, morphological characteristics combined with high-throughput DNA sequencing (HTS) were used to investigate the variations of phytoplankton and the eukaryotic community in a large canyon-shaped, stratified reservoir located at the Heihe River in Shaanxi Province for three months. The results showed that Bacillariophyta and Chlorophyta were the dominant taxa of the phytoplankton community, accounting for more than 97% of total phytoplankton abundance, which mainly consisted of Melosira sp., Cyclotella sp., and Chlorella sp., respectively. Illumina Miseq sequencing suggested that the biodiversity of eukaryotes increased over time and that species distribution was more even. Arthropoda (6.63% to 79.19%), Ochrophyta (5.60% to 35.16%), Ciliophora (1.81% to 10.93%) and Cryptomonadales (0.25% to 11.48%) were the keystone taxa in common, contributing over 50% of the total eukaryotic community. Cryptomycota as a unique fungus was observed to possess significant synchronization with algal density, reaching a maximum of 10.70% in December (when the algal density distinctly decreased) and suggesting that it might affect the growth of algae through parasitism. Co-occurrence network patterns revealed the complicated and diverse interactions between eukaryotes and phytoplankton, suggesting that eukaryotes respond to variations in dynamic structure of the phytoplankton community, although there might be antagonistic or mutualistic interactions between them. Redundancy analysis (RDA) results showed that environmental variables collectively explained a 96.7% variance of phytoplankton and 96.3% variance of eukaryotic microorganisms, indicating that the temporal variations of phytoplankton and eukaryotic microorganisms were significantly affected by environmental conditions. This study shows that potential interactions exist between phytoplankton and eukaryotic microorganism communities, andcould improve our understanding of the ecological roles of phytoplankton and eukaryotic microorganisms in changing aquatic ecosystems. However, long-term investigations are necessary in order to obtain comprehensive understandings of their complicated associations.

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Community dynamics and function of algae and bacteria during winter in central European great lakes

Cited by 23 publications

References 31 publications

Loci Encoding Compounds Potentially Active against Drug-Resistant Pathogens amidst a Decreasing Pool of Novel Antibiotics

Loci Encoding Compounds Potentially Active against Drug-Resistant Pathogens amidst a Decreasing Pool of Novel Antibiotics

Photoautotrophic picoplankton – a review on their occurrence, role and diversity in Lake Balaton

Community Compositions of Phytoplankton and Eukaryotes during the Mixing Periods of a Drinking Water Reservoir: Dynamics and Interactions

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