Effects of Seasonal Freezing-thawing on the Protistan Communities in a Mountain Lake

2021 ◽  
Author(s):  
Jinxian Liu ◽  
Xiaoqi Li ◽  
Baofeng Chai
Keyword(s):  
Community Structure ◽  
Energy Flow ◽  
Mountain Lake ◽  
Lake Surface ◽  
Freezing And Thawing ◽  
Lake Ecosystems ◽  
Seasonal Freezing ◽  
Subalpine Lake ◽  
Eukaryotic Microorganisms ◽  
Different Depths

Abstract Background: Freezing-thawing cycles are common phenomena in temperate regions. Such events may have a significant influence on the composition of the protistan communities in a mountain lake. Protists are single-celled eukaryotic microorganisms that act as links in the aquatic microbial food web, affecting the transfer of substances and energy transformation. Yet little is known about the effects of freezing and thawing on the protistan community in a mountain lake. Results: The protistan communities in the lake were mainly composed of Ochrophyta, Ciliophora, Choanoflagellida, Cryptophyta, Chlorophyta, Stramenopiles_X, Cercozoa, Dinophyta, and Haptophyta. Seasonal freezing and thawing affected the community composition and diversity of protists. The change in the protistan community structure resulted from a significant change in organic carbon from the ice-covered to ice-free period. During the ice-covered and ice-free periods, temperature and nitrate were the main causes, respectively, for the changes in protistan community structure at different depths. Water depth also affected the structure of the protistan community, but it was not the most important factor. Conclusions: This study revealed that duration of lake surface icing might affect the function of subalpine lake ecosystems, including the rate of nutrient cycling and energy flow, owing to changes in the structure and biodiversity of the microbial community.

Regionalisation of remote European mountain lake ecosystems according to their biota: environmental versus geographical patterns

2009 ◽  
Vol 54 (12) ◽  
pp. 2470-2493 ◽  
Author(s):  
MARTIN KERNAN ◽  
MARC VENTURA ◽  
PETER BITUŠÍK ◽  
ANTON BRANCELJ ◽  
GINA CLARKE ◽  
...  
Keyword(s):  
Mountain Lake ◽  
Lake Ecosystems ◽  
Geographical Patterns ◽  
European Mountain

Epiphyton of oligotrophic lakes of Leningrad region

2021 ◽  
pp. 71-79
Author(s):  
Elena V. Stanislavskaya
Keyword(s):  
Community Structure ◽  
Dominant Species ◽  
Taxonomic Composition ◽  
Species Level ◽  
Taxonomic Structure ◽  
Leningrad Region ◽  
Oligotrophic Lakes ◽  
Epiphytic Algae ◽  
Lake Ecosystems ◽  
Epiphytic Communities

Here are results of investigation of taxonomic composition, community structure and dominant species of epiphytic algae in 12 oligotrophic lakes located in different geomorphic regions of Leningrad region. In summer epiphytic communities there were 385 algal taxa, they belonged to 6 taxonomic divisions: Cyanophyta (Cyanoprokaryota) – 50 (13%), Bacillaryophyta – 175 (45%), Chlorophyta – 37 (10%), Charophyta – 118 (30%), Xanthophyta – 4 (1,55%), Rhodophyta – 1 (0,45%). The taxonomic structure of each lake was predominant diatoms and desmids, but the biomass was dominated by zygnems and green algae. In total, the taxonomic composition of the epiphyton in the studied lakes is similar, the differences are revealed at the species level. The structure of dominanting epiphyton complex was rather constant and composed by a small number of species. The greatest contribution to the epiphyton was made by Tabellaria flocculosa and species of the genus Bulbochaete. The structure of the epiphyton reflects the undisturbed nature of lake ecosystems, as well as their northern location.

Measuring and modelling the dynamic response of remote mountain lake ecosystems to environmental change (the MOLAR project)

2001 ◽  
Vol 27 (6) ◽  
pp. 3774-3779 ◽  
Author(s):  
R. W. Battarbee ◽  
S. T. Patrick ◽  
B. Wathne ◽  
R. Psenner ◽  
R. Mosello
Keyword(s):  
Dynamic Response ◽  
Environmental Change ◽  
Mountain Lake ◽  
Lake Ecosystems

scholarly journals The Community Structure of Picophytoplankton in Lake Fuxian, a Deep and Oligotrophic Mountain Lake

2019 ◽  
Vol 10 ◽  
Author(s):  
Xiaoli Shi ◽  
Shengnan Li ◽  
Huabing Li ◽  
Feizhou Chen ◽  
Qinglong Wu
Keyword(s):  
Community Structure ◽  
Mountain Lake ◽  
Lake Fuxian

scholarly journals Comparison of Community and Function of Dissimilatory Nitrate Reduction to Ammonium (DNRA) Bacteria in Chinese Shallow Lakes with Different Eutrophication Degrees

Water ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 174 ◽  
Author(s):  
Xiaowen Li ◽  
Chunlei Song ◽  
Zijun Zhou ◽  
Jian Xiao ◽  
Siyang Wang ◽  
...  
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Shallow Lakes ◽  
Nitrate Reduction ◽  
Bacterial Community Structure ◽  
Physical Parameters ◽  
Lake Chaohu ◽  
Lake Ecosystems ◽  
Dissimilatory Nitrate Reduction ◽  
Significant Difference

Dissimilatory nitrate reduction to ammonium (DNRA) plays an important role in controlling nitrogen (N) loading in lake ecosystems. However, studies on the linkage between DNRA bacterial community structure and lake eutrophication remain unclear. We examined the community and abundance of DNRA bacteria at six basins of four shallow lakes with different degrees of eutrophication in China. Measurements of the different forms of N and phosphorus (P) in the water column and interstitial water as well as total organic carbon (TOC) and sulfide in the sediments in summer (July 2016) were performed. The nutritional status of Lake Chaohu was more serious than that of the lakes in Wuhan, including Lake Qingling, Lake Houguan, and Lake Zhiyin by comparing geochemical and physical parameters. We found a higher abundance of the nrfA gene, which is a function gene of DNRA bacteria in sediments with higher contents of TOC and sulfide. Moreover, nitrate was a significant factor influencing the DNRA bacterial community structure. A significant difference of the DNRA bacterial community structure between Lake Chaohu and the lakes in Wuhan was discovered. Furthermore, DNRA bacterial abundance and community positively correlated with NH4+ and Chl a concentrations in Lake Chaohu, in which a percent abundance of dominant populations varied along eutrophication gradients. Overall, the abundance and community structure of the DNRA bacteria might be important regulators of eutrophication and cyanobacteria bloom in Lake Chaohu.

scholarly journals Picocyanobacterial community structure and space-time dynamics in the subalpine Lake Maggiore (N. Italy)

2012 ◽  
Vol 71 (1) ◽  
pp. 9 ◽  
Author(s):  
Cristiana Callieri ◽  
Emanuele Caravati ◽  
Gianluca Corno ◽  
Roberto Bertoni
Keyword(s):  
Community Structure ◽  
Space Time ◽  
Time Dynamics ◽  
Lake Maggiore ◽  
Subalpine Lake

Influence of moisture and freeze–thaw on leaf microbial community dynamics

2010 ◽  
Vol 40 (2) ◽  
pp. 394-400 ◽  
Author(s):  
C. Corrigan ◽  
M. Oelbermann
Keyword(s):  
Organic Matter ◽  
Community Structure ◽  
Microbial Community ◽  
Sugar Maple ◽  
Community Dynamics ◽  
Nitrogen Concentration ◽  
Fagus Grandifolia ◽  
Nutrient Inputs ◽  
Freezing And Thawing ◽  
Freeze Thaw

In forest ecosystems, litterfall that collects in trapping devices, to quantify organic matter and nutrient inputs, is exposed to periods of wetting, drying, freezing, and thawing. These fluctuating environmental conditions may influence the microbial community structure inhabiting the leaves and may result in the loss of mobile nutrients, leading to an underestimation of actual organic matter and nutrient inputs. The objectives of this study were to evaluate the influence of (i) different quantities of moisture (LOW = 30 mm, MED = 60 mm, HI = 100 mm) and (ii) freeze–thaw (FT) on leaf (sugar maple ( Acer saccharum Marsh.), American basswood ( Tilia americana L.), and American beech ( Fagus grandifolia Ehrh.)) microbial activity and community structure. There was a significantly greater (p < 0.05) CO2 production rate in LOW and FT treatments for sugar maple and beech, and in HI and FT treatments for basswood. A similar trend occurred for leaf nitrogen concentration but not for carbon (C). Utilization of C substrates was up to 10% greater in the FT treatments. Principal components analysis on the activity of C source utilization showed a distinct clustering between leaf species and between treatments following a pattern similar to that of microbial respiration. Results from this study suggested that the collection of litter should take place more frequently during seasons when frost is imminent.

Sign in / Sign up

Export Citation Format

Share Document