Publication details

One-year passive warming effect on antarctic lichens Placopsis antarctica

Authors

CASANOVA-KATNY Angelica BARTÁK Miloš

Year of publication 2021
Type Article in Proceedings
Conference Book of abstracts, XXII Symposium of Cryptogamic Botany
MU Faculty or unit

Faculty of Science

Citation
Web link to Book of Abstracts (pdf)
Keywords lichen Antarctics open top chambers
Description Although in Antarctica, long-term ecophysiological studies have been carried out on the only two existing vascular plants, only few experiments have been focused on the far more species-rich and dominant cryptogamic biota. Here we report a field study of lichens growing under passive warming inside open top chambers (OTC) installed on Fildes Peninsula (King George Island, South Shetland Island Archipelago). We compared primary photochemical processes of photosynthesis between thalli of the lichen Placopsis antarctica growing for one year inside the OTC with controls outside OTC under ambient conditions. We measured effective quantum yield of photosystem II (?PSII) and photosynthetic electron transport rate (ETR) in daily courses. We examined the responses of diurnal ?PSII to PAR and in relation to environmental factors through continuous 12-d-long monitoring of chlorophyll fluorescence parameters. Our results indicate that the OTC warming microenvironment leads to partial limitation of photosynthetic processes in P. antarctica during the austral summer season. We suggest, that the limitation is caused by accelerated dehydration of thalli inside OTC compared to the outside conditions which are generally colder and wetter, and thus shorter physiologically active periods of lichens in OTC. We deduct that global warming and correlated desiccation potentially decrease photosynthetical performance of lichens.
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