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Alpine Botany

, Volume 121, Issue 1, pp 37–47 | Cite as

Differentiation in morphology and flowering phenology between two Campanula thyrsoides L. subspecies

  • J. F. Scheepens
  • Patrick Kuss
  • Jürg Stöcklin
Original Paper

Abstract

Subspecies are usually characterised by sets of morphological discontinuities. By means of common garden experiments, we investigated genetic differentiation in morphological and phenological traits in two geographically disjunct subspecies of Campanula thyrsoides L., i.e. subsp. thyrsoides (=C.* thyrsoides) occurring in the European Alps and Jura Mountains, and subsp. carniolica (=C.* carniolica) occurring in the Southeastern Alps and the Dinaric Arc. Nine out of 16 investigated traits were significantly different between C.* thyrsoides and C.* carniolica. For C.* carniolica inflorescence length was 1.4×, and above-ground biomass 2.7× higher, while flower density was significantly lower. Campanula* carniolica also showed delayed flowering and flower development from bottom to top as compared to C.* thyrsoides which flowered from top to bottom. The inflorescence growth was indeterminate and flowering took several weeks in C.* carniolica, whereas C.* thyrsoides showed determinate flowering, rapidly opening all flowers within a few days. This differentiation in flowering phenology is likely to be adaptive. The submediterranean climate favours indeterminate flowering in C.* carniolica, allowing ongoing growth of the inflorescence throughout the long summer until environmental conditions worsen, whereas determinate and early flowering in C.* thyrsoides is favourable in the short growing season in the high Alps where seed production must be secured before temperature drops. Glacial survival in refugia with different climates (alpine vs. submediterranean) may have caused this regional differentiation.

Keywords

Campanula thyrsoides subsp. carniolica Common garden Determinate flowering European Alps Glacial history 

Notes

Acknowledgments

We thank Serge Aubert for helping us collecting plant material in the western Alps, Guy Villaume for practical assistence in the common gardens on Mt. Calanda, Thomas Fabbro and Beatrice Krummen for gathering data from natural populations, Gemeinde Haldenstein and the CCES BioChange project of the ETH Zürich providing access to field sites on Mt. Calanda, and Kai and Christine Huovinen for the experimental site in Davos. This study has been supported financially by the Swiss National Science Foundation, project no. 3100AO-116785 to Jürg Stöcklin.

Supplementary material

35_2011_87_MOESM1_ESM.doc (68 kb)
Supplementary material 1 (DOC 68 kb)

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Copyright information

© Swiss Botanical Society 2011

Authors and Affiliations

  • J. F. Scheepens
    • 1
  • Patrick Kuss
    • 2
  • Jürg Stöcklin
    • 1
  1. 1.Institute of BotanyUniversity of BaselBaselSwitzerland
  2. 2.Institute of Plant SciencesUniversity of BernBernSwitzerland

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