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Biodiversity and Conservation

, Volume 17, Issue 3, pp 591–604 | Cite as

Eutrophication and fragmentation are related to species’ rate of decline but not to species rarity: results from a functional approach

  • Christine Römermann
  • Oliver Tackenberg
  • Anne-Kathrin Jackel
  • Peter Poschlod
Original Paper

Abstract

Due to ubiquitous eutrophication and fragmentation, many plant species are actually threatened in Europe. Most ecosystems face an overall nutrient input leading to changes in species composition. Fragmentation is effectively influencing species survival. We investigate if two different measures of species performance of 91 calcareous grassland species–rate of decline and rarity—are related to comparable traits and hence processes. On the one hand we expected that species rate of decline is mainly determined by the processes of eutrophication and fragmentation. On the other hand we hypothesized that the importance of site characteristics may overwhelm the effect of eutrophication and fragmentation for species rarity. Hence, we compared persistence traits responding to eutrophication, dispersal traits being related to fragmentation and ecological site factors for decreasing and increasing species and for rare and common species. The results suggest that increasing species had better means of long-distance dispersal and were more competitive than decreasing species. In contrast, there were hardly any differences in traits between rare and common species, but site characteristics were related to species rarity. Rare species were in the main those with ecological preferences for warm, dry, light and nutrient poor conditions. This study may represent a basis for the assessment of plant species threat. Applying the deduced knowledge about the life history of decreasing versus increasing species to habitat-scale approaches it is possible to predict which species may become threatened in the future simply from the combination of their trait values.

Keywords

Eutrophication Fragmentation Life-history traits Plant species rarity Rate of decline 

Notes

Acknowledgements

We would like to acknowledge all members and contributors of the LEDA-traitbase (www.leda-traitbase.org) for providing species trait data, especially J. Klimešová (data on clonal species) and D. Kunzmann (data on SLA). We thank all contributors of the floristic mapping of Germany and the German Phytodiversity Network (NetPhyD) for providing species distribution data. M. Bernhardt-Römermann gave useful comments on the manuscript. Research was supported by the European Commission (LEDA-project, EVR1-CT-2002-40022).

Supplementary material

10531_2007_9283_MOESM1_ESM.pdf (31 kb)
(PDF 31 kb)

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Christine Römermann
    • 1
    • 2
  • Oliver Tackenberg
    • 3
  • Anne-Kathrin Jackel
    • 1
  • Peter Poschlod
    • 1
  1. 1.Institute of BotanyUniversity of RegensburgRegensburgGermany
  2. 2.Institute of Physical GeographyUniversity of FrankfurtFrankfurtGermany
  3. 3.Institute of Ecology, Evolution & DiversityUniversity of FrankfurtFrankfurtGermany

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