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The Ecology and Conservation of the Gametophyte Generation of the Killarney Fern ( Trichomanes speciosum Willd.) in Ireland

The Ecology and Conservation of the Gametophyte Generation of the Killarney Fern ( Trichomanes... Trichomanes speciosum , which was collected extensively during the Victorian fern craze, is one of the rarest pteridophyte species in Ireland and is protected by both the Wildlife Act, 1976, and the European Union Habitats Directive, 1992 92/43/EEC. Since the discovery in the wild of the independently living gametophyte generation of this species in 1989, the number of known sites for the species has increased, and this may have implications for its conservation status. Sexual reproduction of Trichomanes speciosum is a rare occurrence, but both the sporophyte and gametophyte generations reproduce vegetatively, thereby allowing the generations to persist independently. In the current study, CCA (canonical correspondence analysis) and TWINSPAN (two-way indicator species analysis) were used to determine whether the two generations had different ecological requirements in Ireland that could, in part, explain their differing distributions. The two generations were found to have different species associations; but for both generations, humidity, shade and elevation were found to be the most important factors in determining colony survival. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biology and Environment: Proceedings of the Royal Irish Academy Royal Irish Academy

The Ecology and Conservation of the Gametophyte Generation of the Killarney Fern ( Trichomanes speciosum Willd.) in Ireland

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Publisher
Royal Irish Academy
Copyright
Copyright © 2005 RIA
ISSN
0791-7945
eISSN
2009-003X
DOI
10.3318/BIOE.2005.105.2.71
Publisher site
See Article on Publisher Site

Abstract

Trichomanes speciosum , which was collected extensively during the Victorian fern craze, is one of the rarest pteridophyte species in Ireland and is protected by both the Wildlife Act, 1976, and the European Union Habitats Directive, 1992 92/43/EEC. Since the discovery in the wild of the independently living gametophyte generation of this species in 1989, the number of known sites for the species has increased, and this may have implications for its conservation status. Sexual reproduction of Trichomanes speciosum is a rare occurrence, but both the sporophyte and gametophyte generations reproduce vegetatively, thereby allowing the generations to persist independently. In the current study, CCA (canonical correspondence analysis) and TWINSPAN (two-way indicator species analysis) were used to determine whether the two generations had different ecological requirements in Ireland that could, in part, explain their differing distributions. The two generations were found to have different species associations; but for both generations, humidity, shade and elevation were found to be the most important factors in determining colony survival.

Journal

Biology and Environment: Proceedings of the Royal Irish AcademyRoyal Irish Academy

Published: May 1, 2005

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