| CASANOVA-KATNY, Angelica a Miloš BARTÁK. One-year passive warming effect on antarctic lichens Placopsis antarctica. Online. In P.Matos, Ch. Branquinho, J. Monteiro, P. Pinho, H. Serrano, B. Rocha. Book of abstracts, XXII Symposium of Cryptogamic Botany. Lisboa, Portugal: University of Lisboa, 2021, s. 61-61. |
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@inproceedings{1719656,
author = {CasanovaandKatny, Angelica and Barták, Miloš},
address = {Lisboa, Portugal},
booktitle = {Book of abstracts, XXII Symposium of Cryptogamic Botany},
editor = {P.Matos, Ch. Branquinho, J. Monteiro, P. Pinho, H. Serrano, B. Rocha},
keywords = {lichen Antarctics open top chambers},
howpublished = {elektronická verze "online"},
language = {eng},
location = {Lisboa, Portugal},
pages = {61-61},
publisher = {University of Lisboa},
title = {One-year passive warming effect on antarctic lichens Placopsis antarctica},
url = {http://criptogamica2019.rd.ciencias.ulisboa.pt/PDF/book_of_abstracts.pdf},
year = {2021}
}
TY - JOUR
ID - 1719656
AU - Casanova-Katny, Angelica - Barták, Miloš
PY - 2021
TI - One-year passive warming effect on antarctic lichens Placopsis antarctica
PB - University of Lisboa
CY - Lisboa, Portugal
KW - lichen Antarctics open top chambers
UR - http://criptogamica2019.rd.ciencias.ulisboa.pt/PDF/book_of_abstracts.pdf
N2 - 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 (ΦPSII) and photosynthetic electron transport rate (ETR) in daily courses. We examined the responses of diurnal ΦPSII 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.
ER -
CASANOVA-KATNY, Angelica a Miloš BARTÁK. One-year passive warming effect on antarctic lichens Placopsis antarctica. Online. In P.Matos, Ch. Branquinho, J. Monteiro, P. Pinho, H. Serrano, B. Rocha. \textit{Book of abstracts, XXII Symposium of Cryptogamic Botany}. Lisboa, Portugal: University of Lisboa, 2021, s.~61-61.
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