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Ecological Research

, Volume 21, Issue 2, pp 255–262 | Cite as

Ecophysiological observations on Drosophyllum lusitanicum

  • Wolfram Adlassnig
  • Marianne Peroutka
  • Gregor Eder
  • Walter Pois
  • Irene K. Lichtscheidl
Original Article

Abstract

The carnivorous plant Drosophyllum lusitanicum inhabits heathland and ruderal sites in Portugal, Spain and Morocco. In the literature, various theories have been discussed concerning the ability of Drosophyllum to survive the annual dry period in summer. In August 2004, we examined: (1) the microclimate, (2) soil parameters and (3) the physiological conditions of the plants on two sites in Portugal and Spain. First, during the day, plants are exposed to very high air and soil temperatures and very low air humidity. The climatic extremes are not significantly softened by the population, only the wind speed is drastically decreased. During the night, on the other hand, very high air humidity and dew formation could be observed. The harsh climate is accompanied by stressful soil conditions. Second, the soil is completely dry, poor in fine earth, calcium and nutrients and more or less acid. Third, in spite of these climatic and edaphic extremes, all plants were green, produced trapping mucilage and caught numerous animals. Far from being affected by these conditions, Drosophyllum showed even better growth and reproduction on more extreme sites. We analysed the root system and found living fine roots missing. The osmotic value of the plants is rather low and water storage organs are absent. Therefore we conclude that in summer Drosophyllum is nourished by the dew at night.

Keywords

Drosophyllum lusitanicum Ecophysiology Microclimate Soil Carnivorous plants 

Notes

Acknowledgements

Prof. Dr Martina Weber, Prof. Dr Walter Url and Prof. Dr Roland Albert supported this project from the beginning and contributed many ideas. Prof. Dr Ruis Malhó hosted us in his laboratory in Lisbon. Dr Frederic Pautz and his team helped us with the literature search. Dr Gert Bachmann made the atomic absorption spectrometry of soil samples possible. K. Pranjić helped with the examination of herbarium specimen. Special thanks are due to Prof. Dr Luis Pedro, Prof. Dr Harald Niklfeld and Mag. Ana Julia Pereira who shared their knowledge about Drosophyllum sites with us. Without them, we would have come home without success! This project was supported by grant no. 000134 of the Büro für Auslandsbeziehungen of the University of Vienna.

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Copyright information

© The Ecological Society of Japan 2005

Authors and Affiliations

  • Wolfram Adlassnig
    • 1
  • Marianne Peroutka
    • 1
  • Gregor Eder
    • 1
  • Walter Pois
    • 1
  • Irene K. Lichtscheidl
    • 1
  1. 1.Department of Cell Physiology and Scientific Film, Cell Imaging and Ultrastructure Research Unit, Faculty of Life SciencesUniversity of ViennaViennaAustria

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