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Annals of Botany 86: 717-721, 2000
© 2000 Annals of Botany Company

Seasonal Trends in Nitrogen Status of Antarctic Lichens

Mark J. Hovenden+

School of Plant Science, University of Tasmania, GPO Box 252-55, Hobart, TAS 7001, Australia

Received: 7 December 1999 ; Returned for revision: 3 March 2000 . Accepted: 3 June 2000

The thallus nitrogen (N) concentration of two dominant macrolichens of continental Antarctica (Usnea sphacelata and Umbilicaria decussata) was estimated each month for 1 year on a low rounded knoll on Clark Peninsula, Windmill Islands, Wilkes Land, Antarctica. Thallus N was significantly higher in Umbilicaria decussata than in Usnea sphacelata and varied according to site. During the winter months, when the lichens were metabolically inactive, thalli gradually accumulated N. At the onset of warmer conditions, thallus N content fell dramatically in both species, with the timing of the decline being related to microclimatic conditions. The strongly seasonal pattern of metabolic activity in these species is reflected in their nitrogen relations. Copyright 2000 Annals of Botany Company

Lichen, nitrogen, Antarctica, season, Usnea sphacelata, Umbilicaria decussata


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