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LICHENOMETRY ON ADELAIDE ISLAND, ANTARCTIC PENINSULA: SIZE-FREQUENCY STUDIES, GROWTH RATES AND SNOWPATCHES

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Abstract:

ABSTRACT.

This paper presents new lichenometric population data from the Antarctic Peninsula (67°S), and describes a new approach to lichen growth-rate calibration in locations where dated surfaces are extremely rare. We use historical aerial photography and field surveys to identify sites of former perennial snowpatches where lichen populations now exist. As an independent check on lichen mortality by snowkill, and the timing of snow patch disappearance, we use a positive-degree day (PDD) approach based on monthly climate data from Rothera Research Station. We find that maximum growth rates for lichens <40 mm in diameter on Adelaide Island are around 0.8 mm/yr. Furthermore, we propose that our combined methodology may be more widely applicable to the Polar Regions where the construction of lichenometric dating (age-size) curves remains a problem.

Keywords: Rhizocarpon; glaciation; photogrammetry; positive degree day; snow patches

Document Type: Research Article

DOI: https://doi.org/10.1111/j.1468-0459.2010.00381.x

Affiliations: 1: British Geological Survey, Murchison House, Edinburgh, UK 2: British Antarctic Survey, Cambridge, UK

Publication date: 2010-03-01

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