Temporal variation of Bistorta vivipara -associated ectomycorrhizal fungal communities in the High Arctic

2015 ◽  
Vol 24 (24) ◽  
pp. 6289-6302 ◽  
Author(s):  
Sunil Mundra ◽  
Mohammad Bahram ◽  
Leho Tedersoo ◽  
Håvard Kauserud ◽  
Rune Halvorsen ◽  
...  
Keyword(s):  
Temporal Variation ◽  
High Arctic ◽  
Fungal Communities ◽  
Bistorta Vivipara

scholarly journals Variability and change in Palaeo-Eskimo architecture: A view from the Canadian High Arctic

2005 ◽  
Vol 27 (1-2) ◽  
pp. 191-212 ◽  
Author(s):  
Patricia Sutherland
Keyword(s):  
Temporal Variation ◽  
Temporal Distribution ◽  
High Arctic ◽  
Structural Features ◽  
Social Processes ◽  
Situational Factors ◽  
Symbolic Meaning ◽  
Canadian High Arctic ◽  
Historical Events

Abstract This paper explores the nature and causes of geographical and temporal variation in the architectural remains of Palaeo-Eskimo occupation in the High Arctic. It is suggested that much of the variability in the architectural record relates to local and situational factors rather than to cultural prescription. Three structural features — the box-hearth, midpassage and longhouse — are selected as representing a complex of elements with broad geographical and temporal distribution, and which may have had symbolic meaning related to Palaeo-Eskimo society and worldview. Changes in the form and distribution of these features are summarized, and the degree to which these variations may reflect social processes and historical events is examined.

scholarly journals Diversity and distribution of fungal communities in the marine sediments of Kongsfjorden, Svalbard (High Arctic)

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Tao Zhang ◽  
Neng Fei Wang ◽  
Yu Qin Zhang ◽  
Hong Yu Liu ◽  
Li Yan Yu
Keyword(s):  
Marine Sediments ◽  
High Arctic ◽  
Fungal Communities

scholarly journals Temporal variation in circulating concentrations of organochlorine pollutants in a pelagic seabird breeding in the high Arctic

2016 ◽  
Vol 36 (2) ◽  
pp. 442-448 ◽  
Author(s):  
Jan O. Bustnes ◽  
Bård-Jørgen Bårdsen ◽  
Børge Moe ◽  
Dorte Herzke ◽  
Sveinn A. Hanssen ◽  
...  
Keyword(s):  
Temporal Variation ◽  
High Arctic ◽  
Organochlorine Pollutants ◽  
Pelagic Seabird

Diversity and Distribution of Aquatic Fungal Communities in the Ny-Ålesund Region, Svalbard (High Arctic)

2015 ◽  
Vol 71 (3) ◽  
pp. 543-554 ◽  
Author(s):  
Tao Zhang ◽  
Neng-Fei Wang ◽  
Yu-Qin Zhang ◽  
Hong-Yu Liu ◽  
Li-Yan Yu
Keyword(s):  
High Arctic ◽  
Fungal Communities

scholarly journals Dead or Alive; or Does It Really Matter? Level of Congruency Between Trophic Modes in Total and Active Fungal Communities in High Arctic Soil

2019 ◽  
Vol 9 ◽  
Author(s):  
Magdalena Wutkowska ◽  
Anna Vader ◽  
Sunil Mundra ◽  
Elisabeth J. Cooper ◽  
Pernille B. Eidesen
Keyword(s):  
High Arctic ◽  
Fungal Communities ◽  
Arctic Soil

scholarly journals Feasibility of hyperspectral vegetation indices for the detection of chlorophyll concentration in three high Arctic plants: Salix polaris, Bistorta vivipara, and Dryas octopetala

2018 ◽  
Vol 87 (4) ◽  
Author(s):  
Bogdan Zagajewski ◽  
Marlena Kycko ◽  
Hans Tømmervik ◽  
Zbigniew Bochenek ◽  
Bronisław Wojtuń ◽  
...  
Keyword(s):  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Chlorophyll Concentration ◽  
High Arctic ◽  
Electromagnetic Spectrum ◽  
Primary Role ◽  
Salix Polaris ◽  
Red Edge ◽  
Dryas Octopetala ◽  
Bistorta Vivipara

Remote sensing, which is based on a reflected electromagnetic spectrum, offers a wide range of research methods. It allows for the identification of plant properties, e.g., chlorophyll, but a registered signal not only comes from green parts but also from dry shoots, soil, and other objects located next to the plants. It is, thus, important to identify the most applicable remote-acquired indices for chlorophyll detection in polar regions, which play a primary role in global monitoring systems but consist of areas with high and low accessibility. This study focuses on an analysis of in situ-acquired hyperspectral properties, which was verified by simultaneously measuring the chlorophyll concentration in three representative arctic plant species, i.e., the prostrate deciduous shrub <em>Salix polaris</em>, the herb <em>Bistorta vivipara</em>, and the prostrate semievergreen shrub <em>Dryas octopetala</em>. This study was conducted at the high Arctic archipelago of Svalbard, Norway. Of the 23 analyzed candidate vegetation and chlorophyll indices, the following showed the best statistical correlations with the optical measurements of chlorophyll concentration: Vogelmann red edge index 1, 2, 3 (VOG 1, 2, 3), Zarco-Tejada and Miller index (ZMI), modified normalized difference vegetation index 705 (mNDVI 705), modified normalized difference index (mND), red edge normalized difference vegetation index (NDVI 705), and Gitelson and Merzlyak index 2 (GM 2). An assessment of the results from this analysis indicates that <em>S. polaris</em> and <em>B. vivipara</em> were in good health, while the health status of <em>D. octopetala</em> was reduced. This is consistent with other studies from the same area. There were also differences between study sites, probably as a result of local variation in environmental conditions. All these indices may be extracted from future satellite missions like EnMAP (Environmental Mapping and Analysis Program) and FLEX (Fluorescence Explorer), thus, enabling the efficient monitoring of vegetation condition in vast and inaccessible polar areas.

scholarly journals One-time Nitrogen Fertilization Shifts Switchgrass Soil Microbiomes within a Context of Larger Spatial and Temporal Variation

2019 ◽  
Author(s):  
Huaihai Chen ◽  
Zamin K. Yang ◽  
Dan Yip ◽  
Reese H. Morris ◽  
Steven J. Lebreux ◽  
...  
Keyword(s):  
Temporal Variation ◽  
Fungal Community ◽  
Temporal Variability ◽  
N Fertilization ◽  
Fungal Communities ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Spatial And Temporal Variation ◽  
Vertical Heterogeneity ◽  
Over Time

AbstractSoil microbiome responses to short-term nitrogen (N) inputs within the context of existing spatio-temporal variability remain uncertain. Here, we examined soil bacterial and fungal communities pre/post-N fertilization in an 8 year-old switchgrass field, in which twenty-four plots received N fertilization at three levels (0, 100, and 200 kg N ha-1 as NH4NO3) for the first time since planting. Soils were collected at two depths, 0-5 and 5-15 cm, for DNA extraction and amplicon sequencing of 16S rRNA genes and ITS regions, and soil metagenomic analysis. Baseline assessment prior to fertilization revealed no pre-existing differences in either bacterial or fungal communities across plots. The one-time N fertilization increased switchgrass yields and tissue N content, and the added N was nearly completely removed from the soil of fertilized plots by the end of the growing season. Both bacterial/archaeal and fungal communities showed large spatial (by depth) and temporal variation (by season) within each plot, accounting for 17 and 12-22 % of the variation in bacterial/archaeal and fungal community composition, respectively. While N fertilization effects accounted for only ~4% of overall variation, some specific microbial groups, including the bacterial genus Pseudonocardia and the fungal genus Archaeorhizomyces, were notably repressed by fertilization at 200 kg N ha-1. Bacterial groups varied with both depth in the soil profile and time of sampling, while temporal variability shaped the fungal community more significantly than vertical heterogeneity in the soil. Thus, variability within the field might override the changes induced by N addition. Continued analyses of these trends over time with fertilization and management are needed to understand whether these transient effects change over time.

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