scholarly journals Bacterial community changes with cryoconite granule size and their susceptibility to exogenous nutrients on 10 glaciers in northwestern Greenland

2019 ◽  
Author(s):  
Jun Uetake ◽  
Naoko Nagatuska ◽  
Yukihiko Onuma ◽  
Nozomu Takeuchi ◽  
Hideaki Motoyama ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Growth Process ◽  
Correlation Coefficients ◽  
Community Change ◽  
Early Growth ◽  
Granule Size ◽  
Filamentous Cyanobacterium ◽  
Glacier Ice ◽  
Cryoconite Hole ◽  
Exogenous Nutrients

AbstractCryoconite granules, which are dark-colored biological aggregates on glaciers, effectively accelerate the melting of glacier ice. Bacterial community varies with granule size, however, community change in space and their susceptibility to environmental factors has not been described yet. Therefore, we focused on bacterial community from 4 different granule sizes (30-249 μm, 250- 750 μm, 750-1599 μm, more than 1600 μm diameter) in 10 glaciers in northwestern Greenland and their susceptibility for exogenous nutrients in cryoconite hole. A filamentous cyanobacterium Phormidesmis priestleyi, which has been frequently reported from glaciers in Arctic was abundant (10-26%) across any size of granules on most of glaciers. Bacterial community across glaciers became similar with size increase, and whence smallest size fractions contain more unique genera in each glacier. Multivariate analysis suggests that phosphate, which is significantly higher in one glacier (Scarlet Heart Glacier), is primary associated with bacterial beta diversity. Correlation coefficients between abundance of major genera and nutrients largely changed with granule size, suggesting that nutrients susceptibility to genera changes with growth process of granule (e.g. P. priestleyi was affected by nitrate in early growth stage).

scholarly journals Bacterial community changes with granule size in cryoconite and their susceptibility to exogenous nutrients on NW Greenland glaciers

2019 ◽  
Vol 95 (7) ◽  
Author(s):  
Jun Uetake ◽  
Naoko Nagatsuka ◽  
Yukihiko Onuma ◽  
Nozomu Takeuchi ◽  
Hideaki Motoyama ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Growth Stage ◽  
Community Change ◽  
Early Growth ◽  
Granule Size ◽  
Filamentous Cyanobacterium ◽  
Early Growth Stage ◽  
Cryoconite Hole ◽  
Community Changes ◽  
Exogenous Nutrients

ABSTRACT Cryoconite granules are dark-colored biological aggregates on glaciers. Bacterial community varies with granule size, however, community change in space and their susceptibility to environmental factors has not been described yet. Therefore, we focused on bacterial community from four different granule sizes (30–249 μm, 250–750 μm, 750–1599 μm, more than 1600 μm diameter) in 10 glaciers in northwestern Greenland and their susceptibility to exogenous nutrients in cryoconite hole. A filamentous cyanobacterium Phormidesmis priestleyi, which has been frequently reported from glaciers in Arctic was abundant (10%–26%) across any size of granules on most of glaciers. Bacterial community across glaciers became similar with size increase, and whence smallest size fractions contain more unique genera in each glacier. Multivariate analysis revealed that effect of nutrients to beta diversity is larger in smaller granules (30–249 μm and 250–750 μm diameter), suggesting that bacterial susceptibility to nutrients changes with growth of granule (i.e. P. priestleyi was affected by nitrate in early growth stage).

The early growth process of helium blistering in tungsten and molybdenum: First-principles and statistical model calculations

2021 ◽  
Vol 550 ◽  
pp. 152938
Author(s):  
Kun Jie Yang ◽  
Yue-Lin Liu ◽  
Hai-Hong Li ◽  
Peng Shao ◽  
Xu Zhang ◽  
...  
Keyword(s):  
Statistical Model ◽  
First Principles ◽  
Growth Process ◽  
Early Growth ◽  
Model Calculations

scholarly journals Sequential Path Analysis for Determination of Relationship Between Yield and Yield Components in Bread Wheat (Triticum aestivum.L.)

2014 ◽  
Vol 6 (1) ◽  
pp. 119-124 ◽  
Author(s):  
Mohtasham MOHAMMADI ◽  
Peyman SHARIFI ◽  
Rahmatollah KARIMIZADEH
Keyword(s):  
Grain Yield ◽  
Path Analysis ◽  
Plant Height ◽  
Canopy Temperature ◽  
Correlation Coefficients ◽  
Early Growth ◽  
Spike Length ◽  
Lattice Design ◽  
Growth Vigor ◽  
Positive Direct

An experiment was conducted to evaluate 295 wheat genotypes in Alpha-Lattice design with two replications. The arithmetic mean and standard deviation of grain yield was 2706 and 950 (kg/ha),respectively. The results of correlation coefficients indicated that grain yield had significant and positive association with plant height, spike length, early growth vigor and agronomic score. Whereas there were negative correlation coefficients between grain yield and days to physiological maturity and canopy temperature before and during anthesis. Path analysis indicated agronomic score and plant height had high positive direct effects on grain yield, while canopy temperature before and during anthesis, and days to maturity, wes another trait having negative direct effect on grain yield. The results of sequential path analysis showed the traits that accounted as a criteria variable for high grain yield were agronomic score, plant height, canopy temperature, spike length, chlorophyll content and early growth vigor, which were determined as first, second and third order variables and had strong effects on grain yield via one or more paths. More important, as canopy temperature, agronomic score and early growth vigor can be evaluated quickly and easily, these traits may be used for evaluation of large populations.

Removal of nonylphenol by earthworms and bacterial community change

2014 ◽  
Vol 96 ◽  
pp. 9-17 ◽  
Author(s):  
Chu-Wen Yang ◽  
Sen-Lin Tang ◽  
Ling-Yun Chen ◽  
Bea-Ven Chang
Keyword(s):  
Bacterial Community ◽  
Community Change

scholarly journals Community change of microorganisms in the Muztagata and Dunde glacier and climatic and environmental implications

2016 ◽  
Author(s):  
Yong Chen ◽  
Xiang-Kai Li ◽  
Jing Si ◽  
Guang-Jian WU ◽  
Li-De Tian ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Cell Density ◽  
Ice Core ◽  
Ice Cores ◽  
Community Change ◽  
Rrna Gene ◽  
Environmental Implications ◽  
Depth Profiles ◽  
Ice Cap ◽  
Glacier Ice

Abstract. Microorganisms are continuously blown onto the glacier snow, and thus the glacial depth profiles provide excellent geographic archives of the microbial communities. However, it is uncertain about how the microbial communities respond to the climatic and environmental changes over the glacier ice. In the present study, the live microbial density, stable isotopic ratios, 18O/16O in the precipitation, and mineral particle concentrations along the glacial depth profiles were collected from ice cores from the Muztagata glacier and the Dunde ice cap. Six bacterial 16S rRNA gene clone libraries were established from the Dunde ice core. The Muztagata ice core presented seasonal response patterns for both live and total cell density with high cell density occurring in the warming spring and summer. Both ice core data showed a frequent association of dust and microorganisms in the ice. Genera Polaromas sp., Pedobacter sp, Flavobacterium sp., Cryobacteriium sp., and Propionibacterium/Blastococcus sp. frequently appeared at the six tested ice layers, and constituted the dominant species endemic to the Dunde ice cap, whereas some genera such as Rhodoferax sp., Variovorax sp., Sphingobacterium sp., Cyanobacterium sp., Knoellia sp., and Luteolibacter sp. rarely presented in the ice. In conclusion, data present a discrete increase of microbial cell density in the warming seasons and biogeography of the microbial communities associated with the predominance of a few endemic groups in the local glacial regions. This reinforces our hypothesis of dust-borne and post-deposition being the main agents interactively controlling microbial load in the glacier ice.

scholarly journals Intercropping Agricultural Practices by Improving Maize Early Growth Process: A Bio-Statistical Approach

2019 ◽  
Vol 9 (1) ◽  
pp. 1-15
Author(s):  
Dago Dougba Noel ◽  
Tuo Yalamoussa ◽  
Niamien Coffi Jean Magloire ◽  
Moroh Aboya Jean-Luc ◽  
Dagnogo Dramane ◽  
...  
Keyword(s):  
Growth Process ◽  
Statistical Approach ◽  
Agricultural Practices ◽  
Early Growth

scholarly journals Carbon fluxes through bacterial communities on glacier surfaces

2010 ◽  
Vol 51 (56) ◽  
pp. 32-40 ◽  
Author(s):  
Alexandre M. Anesio ◽  
Birgit Sattler ◽  
Christine Foreman ◽  
Jon Telling ◽  
Andy Hodson ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Bacterial Abundance ◽  
Heterotrophic Bacteria ◽  
Community Respiration ◽  
Organic C ◽  
C Cycle ◽  
Cryoconite Hole ◽  
Eukaryotic Organisms ◽  
Doubling Times

AbstractThere is very little information about the activity of microbial communities on the surface of glaciers, though there is an increasing body of evidence to show that they strongly influence the biogeochemistry of these habitats. We measured bacterial abundance and production in cryoconite holes on Arctic, Antarctic and Alpine glaciers in order to estimate the role of heterotrophic bacteria within the carbon budget of glacial ecosystems. Our results demonstrate an active bacterial community on the surface of glaciers with doubling times that vary from a few hours to hundreds of days depending on the glacier and position (water or sediments) within the cryoconite hole. However, bacterial production is only ∼2–3% of the published literature values of community respiration from similar habitats, indicating that other types of microbes (e.g. eukaryotic organisms) may also play a role in the C cycle of glaciers. We estimate that only up to 7% of the organic C in cryoconite sediments is utilized by the heterotrophic bacterial community annually, suggesting that the surface of glaciers can accumulate organic carbon, and that this C may be important for biogeochemical activity downstream to adjacent ecosystems.

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