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@article{1094365,
author = {Elster, Josef and Kvíderová, Jana and Hájek, Tomáš and Láska, Kamil and Šimek, Miloslav},
article_location = {Polsko},
article_number = {4},
doi = {http://dx.doi.org/10.2478/v10183-012-0021-4},
keywords = {Arctic; Svalbard; Cyanobacteria; nitrogenase activity; photosynthesis},
language = {eng},
issn = {0138-0338},
journal = {Polish Polar Research},
title = {Impact of warming on Nostoc colonies (Cyanobacteria) in a wet hummock meadow, Spitsbergen},
volume = {33},
year = {2012}
}
TY - JOUR
ID - 1094365
AU - Elster, Josef - Kvíderová, Jana - Hájek, Tomáš - Láska, Kamil - Šimek, Miloslav
PY - 2012
TI - Impact of warming on Nostoc colonies (Cyanobacteria) in a wet hummock meadow, Spitsbergen
JF - Polish Polar Research
VL - 33
IS - 4
SP - 395-420
EP - 395-420
PB - Polska akademia nauk
SN - 01380338
KW - Arctic
KW - Svalbard
KW - Cyanobacteria
KW - nitrogenase activity
KW - photosynthesis
N2 - In order to simulate the warming effects on Arctic wetlands, three passive open-top chambers (OTCs) and three control cage-like structures (CCSs) equipped with soil temperature and soil volumetric water content (VWC) probes for continuous microclimatic measurements were installed in a wet hummock meadow, Petuniabukta, Billefjorden, central Spitsbergen, in 2009. The warming effects on primary productivity were investigated during summer seasons 2009 and 2010 in cyanobacterial colonies of Nostoccommune s.l., which plays an important role in the local carbon and nitrogen cycles. The microclimatic data indicated that the effect of OTCs was dependent on microtopography. During winter, two short-term snow-thaw episodes occurred, so that liquid water was available for the Nostoc communities. Because of the warming, the OTC hummock bases remained unfrozen three weeks longer in comparison to the CCSs and, in spring, the OTC hummock tops and bases exceeded 0 deg.C several days earlier than CCS ones. Mean summer temperature differences were 1.6 deg.C in OTC and CCS hummock tops, and 0.3 deg.C in the OTC and CCS hummock bases. The hummock tops were drier than their bases; however the VWC difference between theOTCs and CCSs was small. Due to the onlyminor differences in the microclimate of OTC and CCS hummock bases, where the Nostoc colonies were located, no differences in ecophysiological characteristics of Nostoc colonies expressed as photochemistry parameters and nitrogenase activities were detected after two years exposition. Long-term monitoring of Nostoc ecophysiology in a manipulated environment is necessary for understanding their development under climate warming.
ER -
ELSTER, Josef, Jana KVÍDEROVÁ, Tomáš HÁJEK, Kamil LÁSKA a Miloslav ŠIMEK. Impact of warming on Nostoc colonies (Cyanobacteria) in a wet hummock meadow, Spitsbergen. \textit{Polish Polar Research}. Polsko: Polska akademia nauk, 2012, roč.~33, č.~4, s.~395-420. ISSN~0138-0338. Dostupné z: https://dx.doi.org/10.2478/v10183-012-0021-4.
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