scholarly journals Long‐term experimental warming alters community composition of ascomycetes in Alaskan moist and dry arctic tundra

2015 ◽  
Vol 24 (2) ◽  
pp. 424-437 ◽  
Author(s):  
Tatiana A. Semenova ◽  
Luis N. Morgado ◽  
Jeffrey M. Welker ◽  
Marilyn D. Walker ◽  
Erik Smets ◽  
...  
Keyword(s):  
Community Composition ◽  
Arctic Tundra ◽  
Experimental Warming

scholarly journals Evidence for long-term shift in plant community composition under decadal experimental warming

2015 ◽  
Vol 103 (5) ◽  
pp. 1131-1140 ◽  
Author(s):  
Zheng Shi ◽  
Rebecca Sherry ◽  
Xia Xu ◽  
Oleksandra Hararuk ◽  
Lara Souza ◽  
...  
Keyword(s):  
Community Composition ◽  
Plant Community ◽  
Plant Community Composition ◽  
Experimental Warming

scholarly journals The total and active bacterial community of the chlorolichen Cetraria islandica and its response to long-term warming in sub-Arctic tundra

2020 ◽  
Author(s):  
Ingeborg J. Klarenberg ◽  
Christoph Keuschnig ◽  
Denis Warshan ◽  
Ingibjörg Svala Jónsdóttir ◽  
Oddur Vilhelmsson
Keyword(s):  
Bacterial Community ◽  
Community Composition ◽  
Relative Abundance ◽  
Environmental Conditions ◽  
Bacterial Community Composition ◽  
Arctic Tundra ◽  
Amplicon Sequencing ◽  
Total Community ◽  
First Time

AbstractLichens are traditionally defined as a symbiosis between a fungus and a green alga and or a cyanobacterium. This idea has been challenged by the discovery of bacterial communities inhabiting the lichen thalli. These bacteria are thought to contribute to the survival of lichens under extreme and changing environmental conditions. How these changing environmental conditions affect the lichen-associated bacterial community composition remains unclear.We describe the total (rDNA-based) and potentially metabolically active (rRNA-based) bacterial community of the lichen Cetaria islandica and its response to long-term warming using a 20-year warming experiment in an Icelandic sub-Arctic tundra. 16S rRNA and rDNA amplicon sequencing showed that the orders Acetobacterales (of the class Alphaproteobacteria) and Acidobacteriales (of the phylum Acidobacteria) dominated the bacterial community. Numerous ASVs (amplicon sequence variants) taxa could only be detected in the potentially active community but not in the total community. Long-term warming led to increases in relative abundance on class, order and ASV level. Warming altered the relative abundance of ASVs of the most common bacterial genera, such as Granulicella and Endobacter. The potentially metabolically active bacterial community was also more responsive to warming than the total community.Our results suggest that the bacterial community of the lichen C. islandica is dominated by acidophilic taxa and harbors disproportionally active rare taxa. We also show for the first time that climate warming can lead to shifts in lichen-associated bacterial community composition.

Responses of surface SOC to long-term experimental warming vary between different heath types in the high Arctic tundra

2020 ◽  
Vol 71 (4) ◽  
pp. 752-767
Author(s):  
Ji Young Jung ◽  
Anders Michelsen ◽  
Mincheol Kim ◽  
Sungjin Nam ◽  
Niels M. Schmidt ◽  
...  
Keyword(s):  
Arctic Tundra ◽  
High Arctic ◽  
Experimental Warming

scholarly journals The Total and Active Bacterial Community of the Chlorolichen Cetraria islandica and Its Response to Long-Term Warming in Sub-Arctic Tundra

2020 ◽  
Vol 11 ◽  
Author(s):  
Ingeborg J. Klarenberg ◽  
Christoph Keuschnig ◽  
Denis Warshan ◽  
Ingibjörg Svala Jónsdóttir ◽  
Oddur Vilhelmsson
Keyword(s):  
Bacterial Community ◽  
Community Composition ◽  
Relative Abundance ◽  
Environmental Conditions ◽  
Bacterial Community Composition ◽  
Arctic Tundra ◽  
Amplicon Sequencing ◽  
Total Community ◽  
First Time

Lichens are traditionally defined as a symbiosis between a fungus and a green alga and or a cyanobacterium. This idea has been challenged by the discovery of bacterial communities inhabiting the lichen thalli. These bacteria are thought to contribute to the survival of lichens under extreme and changing environmental conditions. How these changing environmental conditions affect the lichen-associated bacterial community composition remains unclear. We describe the total (rDNA-based) and potentially metabolically active (rRNA-based) bacterial community of the lichen Cetaria islandica and its response to long-term warming using a 20-year warming experiment in an Icelandic sub-Arctic tundra. 16S rRNA and rDNA amplicon sequencing showed that the orders Acetobacterales (of the class Alphaproteobacteria) and Acidobacteriales (of the phylum Acidobacteria) dominated the bacterial community. Numerous amplicon sequence variants (ASVs) could only be detected in the potentially active community but not in the total community. Long-term warming led to increases in relative abundance of bacterial taxa on class, order and ASV level. Warming altered the relative abundance of ASVs of the most common bacterial genera, such as Granulicella and Endobacter. The potentially metabolically active bacterial community was also more responsive to warming than the total community. Our results suggest that the bacterial community of the lichen C. islandica is dominated by acidophilic taxa and harbors disproportionally active rare taxa. We also show for the first time that climate warming can lead to shifts in lichen-associated bacterial community composition.

Changes in high arctic tundra plant reproduction in response to long-term experimental warming

2010 ◽  
Vol 17 (4) ◽  
pp. 1611-1624 ◽  
Author(s):  
REBECCA A. KLADY ◽  
GREGORY H. R. HENRY ◽  
VALERIE LEMAY
Keyword(s):  
Plant Reproduction ◽  
Arctic Tundra ◽  
High Arctic ◽  
Experimental Warming
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