Growth dynamics after historic disturbance in a montane forest and its implications for an endangered epiphytic lichen |
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Authors: | Jacqueline C Bolli Helene H Wagner Jesse M Kalwij Silke Werth Paolo Cherubini Christoph Scheidegger and Andreas Rigling |
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Institution: | (1) Department of Ecology and Natural Resource Management, Norwegian University of Life Sciences, P. O. Box 5003, 1432 ?s, Norway |
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Abstract: | Bolli J.C., Wagner H.H., Kalwij J.M., Werth S., Cherubini P., Scheidegger C. and Rigling A. 2008. Growth dynamics after historic
disturbance in a montane forest and its implications for an endangered epiphytic lichen. Bot. Helv. 118: 111 – 127.
Endangered forest species are often negatively affected by disturbances, which may have long-lasting effects on the distribution,
abundance and genetic diversity of such species. To understand the effects of historic disturbances, detailed knowledge of
the conditions for survival and recolonisation is needed, and this requires precise information on the perimeter and severity
of historic disturbance events. We reconstructed a major historic disturbance (intensive logging followed by windthrow and
fire in 1871) in the Swiss Jura mountains to analyse its effect on the disturbance-sensitive epiphytic lichen Lobaria pulmonaria. Tree-ring analysis of old and young Norway spruce trees (Picea abies L.), sampled systematically on a 100 m grid, revealed that (1) the disturbance was of intermediate severity, (2) a large,
well-defined area of disturbance was created, and (3) an undisturbed zone remained in the centre of the disturbed area. Acomparison
with lichen genetic data from a previous survey revealed that genetic diversity was particularly high in the remnant zone.
These results suggest that the lichen survived there, and that it re-colonised the disturbed area both from the edge and from
the remnant undisturbed zone. This illustrates that a detailed reconstruction of historic disturbances, as achieved with dendroecology,
is very important for understanding the recolonisation process and thus, the conditions for the long-term persistence of disturbance-sensitive
species in a dynamic landscape.
Submitted 1 November 2007; Accepted 30 August 2008
Subject editor: Sabine Güsewell |
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Keywords: | :" target="_blank">: Dendroecology fire Lobaria pulmonaria logging tree-ring analysis |
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