Record Search Query:[Parameters: Topic='BIOLOGICAL CLASSIFICATION', Term='FUNGI', Variable_Level_1='LICHENS']
Measurements of climate data and the effect of high light and low temperature on the photosynthetic response (photosynthetic gas exchange rates and fluorescence) of mosses and lichens at Granite Harbour
Abstract:
The winter snowfall (during 1994) was unusually large and the area of Botany Bay was uniformly covered to a depth of 50 to 70cm. Furthermore, air temperatures were low being rarely above -6° C. These conditions allowed the opportunity to study the effects of high light at low temperatures on lichens and to track lichen performance at low temperatures. Daily photosynthetic performance was measured ... from a crustose lichen that covers many rock surfaces, Buellia frigida. A number of thalli were labelled on a large rock with fluorescence yield, temperature and light recorded several times a day for nine days. The position of the edge of the snow bank was also recorded as it retreated each day. A second boulder was fitted with a datalogger with light and temperature probes. The response of photosynthesis to temperature (-5°C to +25°C) and light was investigated using gas exchange and fluorescence techniques and making concurrent measurements on a lichen (Umbilicaria aprina) and a moss (Bryum argenteum) at saturating light and temperatures. Frozen specimens of U. aprina were collected from a depth of 50cm in snow to ensure the plants had not received sunlight. The specimens were exposed to full sunlight for 8-10 hour periods and their CO2 exchange and fluorescence parameters were continuously measured. Several data loggers were deployed to gain climate information (local and microclimates) where the plants are found. Chlorophyll a fluorescence activity of selected plants was recorded for about three weeks. Fluorescence measurements are non-contact and a positive signal indicates that the photosystems of the lichen or moss are active.
Quality
The data is reported in the publication. All data is held by the investigator. Please contact Professor Allan Green for more information.
The plant collections (~30,000 mosses, liverwort and lichens collected by Professor Rod Seppelt from Antarctica and sub-Antarctic Islands) are housed in the Australian Antarctic Division herbarium. This herbarium is being formerly ... transferred to the Tasmanian Herbarium. As specimens are fully incorporated into the herbarium (ADT) the data is automatically sent to and held in the Antarctic Database at the Australian Antarctic Division Data Centre. The data is currently in two separate databases, one which searchable and the other is in the process of being moved over.
For more information or access to samples, please contact:
Professor Rod Seppelt Principal Research Scientist Australian Antarctic Division Channel highway Kingston 7050 Tasmania, Australia ph: +61 (03) 6232 3438 fax: +61 (03) 6232 3449 e-mail: rod.seppelt@aad.gov.au
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