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Klammer, Susanne; Posch, Thomas; Sonntag, Bettina; Griebler, Christian; Mindl, Birgit; Psenner, Roland

doi:10.1023/a:1020324629396

Cited by 20 publications

(2 citation statements)

References 72 publications

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“…The presence of chloro-organic pesticides in the water of this littoral zone was confirmed by the low sensitivity of this bacterial group to pollutants reaching the environment (Gonzales et al 1998). However, Beta-subclass of Proteobacteria is a dominating fraction of freshwater microorganisms, particularly in the pelagial zones (Pernthaler et al 1998; Klammer et al 2002; Pesce et al 2006; Lew et al 2011). …”

Section: Discussionmentioning

confidence: 99%

Impact of Pesticide Contamination on Aquatic Microorganism Populations in the Littoral Zone

Lew

Biedunkiewicz

et al. 2012

Arch Environ Contam Toxicol

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The effect of pesticide contamination of the littoral zone on the population of bacteria and fungi was analyzed using the example of a eutrophic water reservoir exposed for >30 years to the influence of expired crop-protection chemicals, mainly DDT. For three consecutive years, quantity analyses of bacteria and fungi were conducted and the composition of the microorganism population analyzed against seasonal dynamics. Mold and yeast-like fungi were also isolated and identified. Within the Bacteria domain, in addition to the large groups of microorganisms (Alphaprotobacteria, Betaprobacteria, and Gammaproteobacteria, Actinobacteria, and Cytophaga-Flavobacterium), the analysis also involved the presence of bacteria predisposed to degraded pesticides in natural environments: Pseudomonas spp. and Alcaligenes spp. The quantity dynamics of aquatic microorganisms indicated that bacteria and fungi under the influence of long-term exposure to DDT can adapt to the presence of this pesticide in water. No modifying effect of DDT was observed on the quantity of microorganisms or the pattern of seasonal relationships in the eutrophic lake. Changes were shown in the percentage share of large groups of bacteria in the community of microorganisms as was an effect of contamination on the species diversity of fungi. The data show the effectiveness of aquatic microorganism–community analyses as a tool for indicating changes in the water environment caused by pesticide contamination.

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Section: Discussionmentioning

confidence: 99%

Impact of Pesticide Contamination on Aquatic Microorganism Populations in the Littoral Zone

Lew

Biedunkiewicz

et al. 2012

Arch Environ Contam Toxicol

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“…By contrast, Alphaproteobacteria are regarded to be rare in the pelagic zones of most lacustrine ecosystems (as opposed to marine pelagic habitats), with only very few exceptions Nishimura and Nagata, 2007). This view is mainly based on the results of quantitative rRNAbased methodology, for example, of whole-cell fluorescence in situ hybridization techniques (for review see Table VI in Klammer et al, 2002, andAppendix 3 in Nishimura andNagata, 2007). However, the presumably most abundant microbial species on earth, the marine bacterium Pelagibacter ubique and relatives-also known as SAR11-cluster (Alphaproteobacteria) (Morris et al, 2002;Rappe et al, 2002;Carlson et al, 2008)-has both a brackish and a freshwater sister group (Bahr et al, 1996;Carlson et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Seasonal bloom dynamics and ecophysiology of the freshwater sister clade of SAR11 bacteria ‘that rule the waves’ (LD12)

2011

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Alphaproteobacteria are common members of marine bacterioplankton assemblages, but are believed to be rare in lacustrine systems. However, uncultured Alphaproteobacteria of the freshwater LD12 lineage form a tight monophyletic sister group with the numerically dominant bacteria in marine epipelagic waters, the SAR11 clade or genus Pelagibacter. Comparative rRNA sequence analysis reveals a global occurrence of LD12 bacteria in freshwater systems. The association of genotypic subclades with single-study systems moreover suggests a regional diversification. LD12 bacteria exhibit distinct and annually recurring spatio-temporal distribution patterns in prealpine lakes, as assessed by seasonally resolved vertical profiling and highthroughput cell counting. During the summer months, these ultramicrobacteria can form cell densities in the surface (epilimnetic) water layers that are comparable to those of their marine counterparts (45 Â 10 8 cells per l). LD12 bacteria had a pronounced preference for glutamine and glutamate over 7 other amino acids in situ, and they exhibited substantially higher uptake of these two substrates (and glycine) than the microbial assemblage in general. In addition, members of LD12 were also able to exploit other monomeric sources of organic carbon such as glucose, fructose or acetate. LD12 seemed to follow an oligotrophic lifestyle with slow but efficient uptake already at low substrate concentrations. Thus, LD12 bacteria do not only share phenotypic and metabolic traits with Pelagibacter, but also seem to thrive in the analogous spatiotemporal niche in freshwaters. The two groups together form one of the rare monophyletic lineages of ultramicrobacteria that have successfully traversed the barrier between marine and freshwater habitats.

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Influence of changeable hydro‐meteorological conditions on dissolved organic carbon and bacterioplankton abundance in a hypertrophic reservoir and downstream river

Zieliński

Grabowska

Jekatierynczuk‐Rudczyk

2015

Ecohydrology

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The variability of dissolved organic carbon (DOC) and bacterioplankton abundance (BA) in a lowland humic reservoir and downstream river were studied in an attempt to find out whether meteorological and hydrological parameters influenced the studied factors during drier and wetter conditions. The study was carried out in two consecutive years (from June to October) that significantly differed in precipitation and hydrological parameters. Despite the observed consistently high values of DOC concentration in the studied waters (on average >20 mg l À1 ), DOC concentration range and dynamics differed significantly between the two compared periods; in the period of 20% lower accumulated precipitation, concentrations of DOC on all the analysed sites were 30% lower, on average. The observed hydrological changes caused by meteorological differences between the two studied periods significantly influenced DOC concentration, both in the dam and the downstream river. BA was much less variable and less dependent on meteorological factors; however, our study demonstrated that hydrological conditions exerted an important influence on DOC concentration, mostly in river. The other finding is the greater influence of hydrological conditions on BA in the reservoir than in the river, regardless of the period. No evident relations between DOC concentration and BA were observed. Water quality, together with hydrology, influences both DOC and BA changes.

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Untitled

Cited by 20 publications

References 72 publications

Impact of Pesticide Contamination on Aquatic Microorganism Populations in the Littoral Zone

Impact of Pesticide Contamination on Aquatic Microorganism Populations in the Littoral Zone

Seasonal bloom dynamics and ecophysiology of the freshwater sister clade of SAR11 bacteria ‘that rule the waves’ (LD12)

Influence of changeable hydro‐meteorological conditions on dissolved organic carbon and bacterioplankton abundance in a hypertrophic reservoir and downstream river

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