Ecophysiological study of Antarctic lichens using manipulated environment approach

BARTÁK, Miloš. Ecophysiological study of Antarctic lichens using manipulated environment approach. In Critical Issues and Research Priorities for the IPY and 2007-2009. 6th PNRA Meeting on Antarctic Biology. Follonica: PNRA, 2007, p. 19-19.

Basic information

Original name

Ecophysiological study of Antarctic lichens using manipulated environment approach

Name in Czech

Ekofyziologická studie antarktických lišejníků s využitím přístupu manipulovaného prostředí

Authors

BARTÁK, Miloš

Edition

Follonica, Critical Issues and Research Priorities for the IPY and 2007-2009. 6th PNRA Meeting on Antarctic Biology, p. 19-19, 1 pp. 2007

Publisher

PNRA

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Other information

Language

English

Type of outcome

Stať ve sborníku

Field of Study

10600 1.6 Biological sciences

Country of publisher

Italy

Confidentiality degree

není předmětem státního či obchodního tajemství

Organization unit

Faculty of Science

Keywords in English

lichens; James Ross Island; open top chambers

Tags

James Ross Island, lichens, open top chambers

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Abstract

V originále

A brief overview of ecophysilogical studies on lichens, performed by the Czech group at the James Ross Island is given. For field studies, an open top chamber (OTC) approach was used to study the impact of elevated air tempretarure on lichens. One OTC was located close to the seashore, the other three OTCs were located at the top of table mountains at the altitude of about 350 m a.s.l. (meseta). While the seashore OTC was dominated by moss species with limited number of lichens on them, the OTCs at the meseta were dominated exclusively by lichen species Usnea antarctica and Umbilicaria decussata. The aim of OTCs installations is to study changes in community structure inside OTCs due to elevated air and soil temperature. To monitor the likely changes in species composition, distribution and production with time of exposition, detailed phytosociological record was taken. A set of temperature and relative air humidity sensors was installed in control plots and OTCs. Temperature and RH data were collected (datalogger, EMS, CZ) in 30 minute interval. The results from the first season (spring 2007) showed that both air and soil temperature were increased in OTC and related to prevailing weather. Samples of typical representatives of lichen flora were collected in the field and measured in the laboratory (J.G. Mendel station, James Ross Island). Responses to dehydration and low-temperature photoinhibition were evaluated using chlorophyll fluorescence imaging technique (fluorometer HFC-010, Photon Systems Instruments, CZ). It was found for Caloplaca sp., Umbilicaria decussata, Usnea antarctica, Leptogium menzeisii and other lichen species, that in spite of interspecific differences, primary photosynthetic processes in lichens are well adapted to extremes and perturbations in environmental factors. It was also shown that capacity of photoprotective mechanisms is sufficient to assure full recovery from severe wet-state photoinhibition of lichen thalli in terms of hours.

In Czech

Je prezentován souhrn ekofyziologických studií na lišejnících uskutečněných pomocí expozičních komor s otevřeným vrcholem instalovaných v severní části ostrova Jamese Rosse, Antarktida.