Journal Title
Title of Journal: Polar Biol
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Abbravation: Polar Biology
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Publisher
Springer Berlin Heidelberg
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Authors: Martina Pichrtová Tomáš Hájek Josef Elster
Publish Date: 2016/06/18
Volume: 39, Issue: 9, Pages: 1653-1662
Abstract
Conjugating green algae of the genus Zygnema Zygnematophyceae Streptophyta are dominant eukaryotic components of hydroterrestrial microbial mats in the Arctic Considering the harsh environmental conditions the aim of this study was to elucidate mechanisms that enable Zygnema spp to thrive in this habitat We hypothesized that changes in morphology physiological performance and stress tolerance take place during the annual life cycle of the algae We thus selected four natural populations of Zygnema spp on Svalbard and investigated them throughout the vegetation season by means of light microscopy and chlorophyll a fluorescence Additionally we also investigated one overwintering population No formation of specialized resting stages eg dormant zygospores was observed Markedly Zygnema spp survived harsh periods as modified vegetative cells ie preakinetes Preakinetes tolerate both desiccation during summer and freezing in winter These cells are not dormant and therefore recover their physiological activity immediately after transfer to favorable conditions undergoing rapid growth in the early spring Nevertheless once preakinetes begin to grow these newly produced vegetative cells lose stress tolerance Such rapid dehardening explains their high mortality due to frequent freeze–thaw cycles in the early spring Arctic Zygnema spp thus face a phenological tradeoff between missing the early growing season and experiencing frost damageWe thank to Kamil Láska for providing map background for a figure showing site location We also wish to thank Daria Tashyreva for her assistance during field expeditions This work was supported by the Grant No 1534645L of the Czech Science Foundation GAČR by projects from the Czech Ministry of Education Youth and Sports KONTAKT ME 934 INGO LA 341 and LM2010009 CzechPolar by Project Reg No CZ107/2200/280190 funded by the European Social Fund and from the government budget of the Czech Republic and as a longterm research development project of the Czech Academy of Sciences RVO 67985939
Keywords:
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- Factors affecting plasma chemistry values of the black-browed albatross Thalassarche melanophrys
- Large numbers of marine mammals winter in the North Water polynya
- First record of lithodid crabs from Antarctic waters off the Balleny Islands
- Biosurfactant production by Arctic and Antarctic bacteria growing on hydrocarbons
- Heat hardening in Antarctic notothenioid fishes
- Bacterial diversity in Greenlandic soils as affected by potato cropping and inorganic versus organic fertilization
- Relationships between Arctic and Antarctic Shewanella strains evaluated by a polyphasic taxonomic approach
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