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Biodiversity and Conservation

, Volume 27, Issue 9, pp 2329–2361 | Cite as

Fragmentation in calcareous grasslands: species specialization matters

  • Siri Lie Olsen
  • Marianne Evju
  • Anders Endrestøl
Original Paper

Abstract

Habitat fragmentation resulting from anthropogenic land-use change may negatively affect both biodiversity and ecosystem structure and function. However, susceptibility to fragmentation varies between species and may be influenced by for instance specialization, functional traits and trophic level. We examined how total and specialist species richness, species composition and functional trait composition at two trophic levels (vascular plants and sap-feeding hoppers) vary with habitat fragmentation (patch size and connectivity) in dry calcareous grasslands in southeast Norway. We found that fragmentation affected plant and hopper species composition both totally and of habitat specialists, but with a net species loss only for the specialists, indicating greater susceptibility of specialized species. Reductions in patch size and increasing isolation negatively affected plant specialists with different sets of traits, effectively reducing the number of species with trait combinations suitable to persist in small and isolated patches. Fragmentation influenced trait composition of the total hopper community, but not of habitat specialists. A lesser degree of habitat association could explain why hoppers, despite belonging to a higher tropic level, seemed to be less susceptible to fragmentation than plants. Nonetheless, our study shows that habitat fragmentation affects both species richness, species composition and trait composition of plants and hoppers, indicating that fragmentation leads not only to a loss of species, but also alters dominance hierarchies and the functionality of grassland communities.

Keywords

Calcareous grasslands Functional traits Habitat fragmentation Auchenorrhyncha Vascular plants 

Notes

Acknowledgements

This study was carried out under the projects “Survey and monitoring of red-listed species” (ARKO, funded by the Norwegian Environment Agency), and “Management of biodiversity and ecosystem services in spatially structured landscapes” (funded by the Norwegian Research Council, grant 208434/F40). We are grateful to A. Often, O. Skarpaas, O.E. Stabbetorp and J. Wesenberg for field work contributions and H. Nickel for inputs on hopper generalist and specialist classification, and to two anonymous reviewers for valuable inputs on a previous version of the manuscript.

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  • Siri Lie Olsen
    • 1
  • Marianne Evju
    • 1
  • Anders Endrestøl
    • 1
  1. 1.Norwegian Institute for Nature Research (NINA)OsloNorway

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