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Biodiversity and Conservation

, Volume 25, Issue 9, pp 1605–1624 | Cite as

Hidden crown jewels: the role of tree crowns for bryophyte and lichen species richness in sycamore maple wooded pastures

  • Thomas KiebacherEmail author
  • Christine Keller
  • Christoph Scheidegger
  • Ariel Bergamini
Original Paper

Abstract

Tree crowns typically cover the vast majority of the surface area of trees, but they are rarely considered in diversity surveys of epiphytic bryophytes and lichens, especially in temperate Europe. Usually only stems are sampled. We assessed the number of bryophyte and lichen species on stems and in crowns of 80 solitary sycamore maple trees (Acer pseudoplatanus) at six sites in wooded pastures in the northern Alps. The total number of species detected per tree ranged from 13 to 60 for bryophytes, from 25 to 67 for lichens, and from 42 to 104 for bryophytes and lichens considered together. At the tree level, 29 % of bryophyte and 61 % of lichen species were recorded only in the crown. Considering all sampled trees together, only 4 % of bryophyte, compared to 34 % of lichen species, were never recorded on the stem. Five out of 10 red-listed bryophyte species and 29 out of 39 red-listed lichen species were more frequent in crowns. The species richness detected per tree was unexpectedly high, whereas the proportion of exclusive crown species was similar to studies from forest trees. For bryophytes, in contrast to lichens, sampling several stems can give a good estimation of the species present at a site. However, frequency estimates may be highly biased for lichens and bryophytes if crowns are not considered. Our study demonstrates that tree crowns need to be considered in research on these taxa, especially in biodiversity surveys and in conservation tasks involving lichens and to a lesser degree also bryophytes.

Keywords

Acer pseudoplatanus Alps Biodiversity Epiphytes Red-listed species Tayloria rudolphiana 

Notes

Acknowledgments

Major thanks are given to the Bristol Foundation, chaired by Mario Broggi, for providing major funding for this project. Furthermore, we acknowledge the Federal Office for the Environment (FOEN) and the Nature Park Diemtigtal for financial support. Sincere thanks are given to L. Hedenäs, H. Köckinger, N. Schnyder, C. Schubiger and E. Urmi for the revision of ambiguous bryophyte specimens, to H. Hofmann and C. Schröck for providing information about Tayloria rudolphiana, to J. Ecker and J. Betsch for their help in the field, to A. Bedolla, K. Ecker, H. and M. Küchler, M. Meier and S. Stofer for their help with databases, GIS, Vegedaz and French language translations, to H. Sonntag at Nature Park Karwendel, to L. Waser for the calculation of CIR images, and to the Tiris-services of the Tyrol province and the Sagis-services of the Salzburg province for the provision of Geo data.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

10531_2016_1144_MOESM1_ESM.pdf (737 kb)
Supplementary material 1 (PDF 737 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • Thomas Kiebacher
    • 1
    Email author
  • Christine Keller
    • 1
  • Christoph Scheidegger
    • 1
  • Ariel Bergamini
    • 1
  1. 1.Swiss Federal Institute for ForestSnow and Landscape Research WSLBirmensdorfSwitzerland

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