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Glacier retreat on South Georgia and implications for the spread of rats

Published online by Cambridge University Press:  17 February 2010

A.J. Cook*
Affiliation:
British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge CB3 0ET, UK
S. Poncet
Affiliation:
South Georgia Surveys, PO Box 756 Stanley, Falkland Islands FIQQ 1ZZ
A.P.R. Cooper
Affiliation:
British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge CB3 0ET, UK
D.J. Herbert
Affiliation:
British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge CB3 0ET, UK
D. Christie
Affiliation:
Government of South Georgia and the South Sandwich Islands (GSGSSI), Government House, Stanley, Falkland Islands

Abstract

Using archival photography and satellite imagery, we have analysed the rates of advance or retreat of 103 coastal glaciers on South Georgia from the 1950s to the present. Ninety-seven percent of these glaciers have retreated over the period for which observations are available. The average rate of retreat has increased from 8 Ma-1 in the 1950s to 35 Ma-1 at present. The largest retreats have all taken place along the north-east coast, where retreat rates have increased to an average of 60 Ma-1 at present, but those on the south-west coast have also been steadily retreating since the 1950s. These data, along with environmental information about South Georgia, are included in a new Geographic Information System (GIS) of the island. By combining glacier change data with the present distribution of both endemic and invasive species we have identified areas where there is an increased risk of rat invasion to unoccupied coastal regions that are currently protected by glacial barriers. This risk has significant implications for the surrounding ecosystem, in particular depletion in numbers of important breeding populations of ground-nesting birds on the island.

Type
Biological Sciences
Copyright
Copyright © Antarctic Science Ltd 2010

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