Habitats and seasons differentiate the assembly of bacterial communities along a trophic gradient of freshwater lakes

2021 ◽  
Author(s):  
Congcong Jiao ◽  
Dayong Zhao ◽  
Rui Huang ◽  
Fei He ◽  
Zhongbo Yu
Keyword(s):  
Bacterial Communities ◽  
Trophic Gradient ◽  
Freshwater Lakes

scholarly journals Seasonal Succession of Bacterial Communities in Three Eutrophic Freshwater Lakes

2021 ◽  
Vol 18 (13) ◽  
pp. 6950
Author(s):  
Bin Ji ◽  
Cheng Liu ◽  
Jiechao Liang ◽  
Jian Wang
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Water Temperature ◽  
Bacterial Communities ◽  
Seasonal Succession ◽  
Lake Eutrophication ◽  
Urban Lake ◽  
Freshwater Lakes ◽  
Functional Prediction ◽  
Bacterial Indicator

Urban freshwater lakes play an indispensable role in maintaining the urban environment and are suffering great threats of eutrophication. Until now, little has been known about the seasonal bacterial communities of the surface water of adjacent freshwater urban lakes. This study reported the bacterial communities of three adjacent freshwater lakes (i.e., Tangxun Lake, Yezhi Lake and Nan Lake) during the alternation of seasons. Nan Lake had the best water quality among the three lakes as reflected by the bacterial eutrophic index (BEI), bacterial indicator (Luteolibacter) and functional prediction analysis. It was found that Alphaproteobacteria had the lowest abundance in summer and the highest abundance in winter. Bacteroidetes had the lowest abundance in winter, while Planctomycetes had the highest abundance in summer. N/P ratio appeared to have some relationships with eutrophication. Tangxun Lake and Nan Lake with higher average N/P ratios (e.g., N/P = 20) tended to have a higher BEI in summer at a water temperature of 27 °C, while Yezhi Lake with a relatively lower average N/P ratio (e.g., N/P = 14) tended to have a higher BEI in spring and autumn at a water temperature of 9–20 °C. BEI and water temperature were identified as the key parameters in determining the bacterial communities of lake water. Phosphorus seemed to have slightly more impact on the bacterial communities than nitrogen. It is expected that this study will help to gain more knowledge on urban lake eutrophication.

scholarly journals Importance of Micromonospora spp. as Colonizers of Cellulose in Freshwater Lakes as Demonstrated by Quantitative Reverse Transcriptase PCR of 16S rRNA

2012 ◽  
Vol 78 (9) ◽  
pp. 3495-3499 ◽  
Author(s):  
Alexandre B. de Menezes ◽  
James E. McDonald ◽  
Heather E. Allison ◽  
Alan J. McCarthy
Keyword(s):  
16S Rrna ◽  
Reverse Transcriptase ◽  
Quantitative Pcr ◽  
Lake Sediment ◽  
Relative Abundance ◽  
Bacterial Communities ◽  
Bacterial Population ◽  
Freshwater Lakes ◽  
Content Type ◽  
Water Columns

ABSTRACTThe relative abundance of micromonosporas in the bacterial communities inhabiting cellulose baits, water columns, and sediments of two freshwater lakes was determined by quantitative PCR (qPCR) of reverse-transcribed 16S rRNA.Micromonosporaspp. were shown to be significant members of the active bacterial population colonizing cellulosic substrates in the lake sediment, and their increased prevalence with greater depth was confirmed by enumeration of CFU.

scholarly journals Characterization of bacterial communities in four freshwater lakes differing in nutrient load and food web structure

2005 ◽  
Vol 53 (2) ◽  
pp. 205-220 ◽  
Author(s):  
Katleen Gucht ◽  
Tom Vandekerckhove ◽  
Nele Vloemans ◽  
Sylvie Cousin ◽  
Koenraad Muylaert ◽  
...  
Keyword(s):  
Food Web ◽  
Bacterial Communities ◽  
Nutrient Load ◽  
Freshwater Lakes ◽  
Food Web Structure ◽  
Web Structure

Patterns and assembly processes of planktonic and sedimentary bacterial community differ along a trophic gradient in freshwater lakes

2019 ◽  
Vol 106 ◽  
pp. 105491 ◽  
Author(s):  
Jin Zeng ◽  
Congcong Jiao ◽  
Dayong Zhao ◽  
Huimin Xu ◽  
Rui Huang ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Trophic Gradient ◽  
Freshwater Lakes

scholarly journals Hypersaline lakes harbor more active bacterial communities

2016 ◽  
Author(s):  
Zachary T Aanderud ◽  
Joshua C Vert ◽  
Jay T Lennon ◽  
Tylan W Magnusson ◽  
Donald P Breakwell ◽  
...  
Keyword(s):  
Environmental Conditions ◽  
Bacterial Communities ◽  
Extreme Environments ◽  
Energetic Cost ◽  
Energy Reserves ◽  
Freshwater Lakes ◽  
Hypersaline Lakes ◽  
Resistance Strategies ◽  
Freshwater Bacteria ◽  
Multiple Chemical

Extremophiles employ a diverse array of resistance strategies to thrive under harsh environmental conditions but maintaining these adaptations comes at an energetic cost. If energy reserves to drop too low, extremophiles may enter a dormant state of reduced metabolic activity to survive. Dormancy is frequently offered as a plausible explanation for the persistence of bacteria under suboptimal environmental conditions with the prevalence of this mechanism only expected to rise as stressful conditions intensify. We estimated dormancy in ten hypersaline and freshwater lakes across the Western United States. To our surprise, we found that extreme environmental conditions did not induce higher levels of bacterial dormancy. Based on our approach using rRNA:rDNA gene ratios to estimate activity, halophilic and halotolerant bacteria were classified as inactive at a similar percentage as freshwater bacteria, and the proportion of the community exhibiting dormancy was considerably lower (16%) in hypersaline than freshwater lakes across a range of cutoffs estimating activity. Of the multiple chemical characteristics we evaluated, salinity and, to a lesser extent, total phosphorus concentrations influenced activity. But instead of dormancy being more common as stressful conditions intensified, the percentage of the community residing in an inactive state decreased with increasing salinity in freshwater and hypersaline lakes, suggesting that salinity acts as a strong environmental filter selecting for bacteria that persist and thrive under saltier conditions. Within the compositionally distinct and less diverse hypersaline communities, abundant taxa were disproportionately active and localized in families Microbacteriaceae (Actinobacteria), Nitriliruptoraceae (Actinobacteria), and Rhodobacteraceae (Alphaproteobacteria). Our results demonstrate that extreme environments may not necessarily be stressful or suboptimal for highly adapted extremophiles causing them to need dormancy less often to survive.

scholarly journals Hypersaline lakes harbor more active bacterial communities

2016 ◽  
Author(s):  
Zachary T Aanderud ◽  
Joshua C Vert ◽  
Jay T Lennon ◽  
Tylan W Magnusson ◽  
Donald P Breakwell ◽  
...  
Keyword(s):  
Environmental Conditions ◽  
Bacterial Communities ◽  
Extreme Environments ◽  
Energetic Cost ◽  
Energy Reserves ◽  
Freshwater Lakes ◽  
Hypersaline Lakes ◽  
Resistance Strategies ◽  
Freshwater Bacteria ◽  
Multiple Chemical

Extremophiles employ a diverse array of resistance strategies to thrive under harsh environmental conditions but maintaining these adaptations comes at an energetic cost. If energy reserves to drop too low, extremophiles may enter a dormant state of reduced metabolic activity to survive. Dormancy is frequently offered as a plausible explanation for the persistence of bacteria under suboptimal environmental conditions with the prevalence of this mechanism only expected to rise as stressful conditions intensify. We estimated dormancy in ten hypersaline and freshwater lakes across the Western United States. To our surprise, we found that extreme environmental conditions did not induce higher levels of bacterial dormancy. Based on our approach using rRNA:rDNA gene ratios to estimate activity, halophilic and halotolerant bacteria were classified as inactive at a similar percentage as freshwater bacteria, and the proportion of the community exhibiting dormancy was considerably lower (16%) in hypersaline than freshwater lakes across a range of cutoffs estimating activity. Of the multiple chemical characteristics we evaluated, salinity and, to a lesser extent, total phosphorus concentrations influenced activity. But instead of dormancy being more common as stressful conditions intensified, the percentage of the community residing in an inactive state decreased with increasing salinity in freshwater and hypersaline lakes, suggesting that salinity acts as a strong environmental filter selecting for bacteria that persist and thrive under saltier conditions. Within the compositionally distinct and less diverse hypersaline communities, abundant taxa were disproportionately active and localized in families Microbacteriaceae (Actinobacteria), Nitriliruptoraceae (Actinobacteria), and Rhodobacteraceae (Alphaproteobacteria). Our results demonstrate that extreme environments may not necessarily be stressful or suboptimal for highly adapted extremophiles causing them to need dormancy less often to survive.

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