Response of the moss Racomitrium lanuginosum to changes in sheep grazing and snow-lie due to a snow-fence
Authors: Scott, David; Welch, David; van der Wal, René; Elston, David A.
Source: Applied Vegetation Science, Volume 10, Number 2, September 2007 , pp. 229-238(10)
Publisher: Opulus Press
Abstract:Question: What are the responses of Racomitrium lanuginosum moss to altered snow-lie and sheep use?
Location: A Carex bigelowii-Racomitrium lanuginosum heath on a Scottish montane plateau affected since 1986 by a fenced ski corridor.
Methods: Permanent quadrats were set up along transects 45 m long perpendicular to the snow-fence. Cover was assessed over a 12-year period from 1990. Pellet-group clearance counts provided data on sheep usage between 1990 and 1996. Snow-lie was mapped in the springs of 1991-1996.
Results: The snow-fence created a gradient in sheep use and altered the duration of snow-lie. At the start of monitoring Racomitrium cover was lower immediately adjacent to the fence, and after 12 years its cover was significantly reduced within 10 m of the fence. Further away from the fence Racomitrium cover was relatively stable. The loss of Racomitrium was correlated both with increased snow-lie and heavier sheep usage. Grass cover increased near the fence and was related to sheep use. Dicranum fuscescens responded differently to Racomitrium, increasing significantly near the fence.
Conclusions: We found that changes in snow-lie and grazing pressure quickly brought about vegetation change in this montane ecosystem. Racomitrium was the most sensitive species to the changes in grazing and snow-lie caused by the fence, having the biggest initial changes. Loss of Racomitrium permitted increases of species more resistant to grazing including Dicranum fuscescens and grasses.
Document Type: Research Article
Publication date: 2007-09-01
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