Plant Ecology

, Volume 219, Issue 2, pp 133–144 | Cite as

Opposite effects of litter and hemiparasites on a dominant grass under different water regimes and competition levels

  • Alejandro LoydiEmail author
  • R. Lutz Eckstein
  • Tobias Gebauer
  • Kristin Ludewig
  • Annette Otte
  • Christoph Reisdorff
  • Kai Jensen
  • Tobias W. Donath


Direct and indirect biotic interactions may affect plant growth and development, but the magnitude of these effects may vary depending on environmental conditions. In grassland ecosystems, competition is a strong structuring force. Nonetheless, if hemiparasitic plant species are introduced the competition intensity caused by the dominant species may be affected. However, the outcome of these interactions may change between wet or dry periods. In order to study this, we performed a pot experiment with different densities of the dominant species Schedonorus arundinaceus (1, 2 or 4 individuals) under constantly moist or intermittently dry conditions. The different Schenodorus densities were crossed with presence or absence of hemiparasites (either Rhinanthus minor or R. alectorolophus). Additionally, pots remained with bare ground or received a grass litter layer (400 g m−2). We expected that indirect litter effects on vegetation (here Schedonorus or Rhinanthus) vary depending on soil moisture. We measured Schedonorus and Rhinanthus aboveground biomass and C stable isotope signature (δ13C) as response variables. Overall, Schedonorus attained similar biomass under moist conditions with Rhinanthus as in pots under dry conditions without Rhinanthus. Presence of Rhinanthus also increased δ13C in moist pots, indicating hemiparasite-induced water stress. Litter presence increased Schedonorus biomass and reduced δ13C, indicating improved water availability. Plants under dry conditions with litter showed similar biomass as under wet conditions without litter. Hemiparasites and litter had opposite effects: hemiparasites reduced Schedonorus biomass while litter presence facilitated grass growth. Contrary to our expectations, litter did not compensate Schedonorus biomass when Rhinanthus was present.


Drought Festuca arundinacea Schreb. Grassland Rhinanthus alectorolophus Rhinanthus minor Schedonorus arundinaceus (Schreb.) Dumort. Stable isotopes Tall fescue 



This work was partly funded by the Alexander von Humboldt Foundation by means of a Georg-Forster-postdoctoral fellowship (A. L.). We thank Lena Kretz and Joseph Scholz-vom Hofe (both Giessen University) for invaluable help during the experiment.

Supplementary material

11258_2017_783_MOESM1_ESM.docx (224 kb)
Supplementary material 1 (DOCX 223 kb)


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Authors and Affiliations

  1. 1.Institute of Landscape Ecology and Resource Management, Research Centre for BioSystems, Land Use and Nutrition (IFZ)Justus-Liebig University GiessenGiessenGermany
  2. 2.Centro de Recursos Naturales Renovables de la Zona Semiárida (CERZOS), Departamento de biología, bioquímica y farmacia, Universidad Nacional del Sur (UNS) - CONICETBahía BlancaArgentina
  3. 3.Department of Environmental and Life Sciences, BiologyKarlstad UniversityKarlstadSweden
  4. 4.Applied Plant Ecology, Biocenter Klein FlottbekUniversity of HamburgHamburgGermany
  5. 5.Department of Geobotany, Faculty of BiologyUniversity of FreiburgFreiburgGermany
  6. 6.Department of Landscape Ecology, Institute for Natural Resource ConservationChristian-Albrechts-University KielKielGermany

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