Skip to main content
Article thumbnail
Location of Repository

Lichenometry on Adelaide Island, Antarctic Peninsula : size-frequency studies, growth rates and snowpatches

By Nicholas Golledge, Jeremy Everest, Tom Bradwell and Joanne Johnson

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

Publisher: Wiley-Blackwell
Year: 2010
DOI identifier: 10.1111/j.1468-0459.2010.00381.x
OAI identifier: oai:nora.nerc.ac.uk:9837

Suggested articles


To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.