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Limited evidence for allelopathic effects of giant hogweed on germination of native herbs

Published online by Cambridge University Press:  03 April 2013

Wibke Wille
Affiliation:
Department of Plant and Environmental Sciences, Botany Group, University of Copenhagen, Rolighedsvej 21 1958, Frederiksberg, Denmark
Jan Thiele
Affiliation:
Department of Plant and Environmental Sciences, Botany Group, University of Copenhagen, Rolighedsvej 21 1958, Frederiksberg, Denmark Applied Landscape Ecology Group, Institute of Landscape Ecology, University of Münster, Robert-Koch-Straße 28, 48149 Münster, Germany
Emer A. Walker
Affiliation:
Department of Plant and Environmental Sciences, Botany Group, University of Copenhagen, Rolighedsvej 21 1958, Frederiksberg, Denmark Department of Ecology and Ecosystem Management, Restoration Ecology Group, Technische Universität München, Emil-Ramann-Straße 6, 85354 Freising, Germany
Johannes Kollmann*
Affiliation:
Department of Plant and Environmental Sciences, Botany Group, University of Copenhagen, Rolighedsvej 21 1958, Frederiksberg, Denmark Department of Ecology and Ecosystem Management, Restoration Ecology Group, Technische Universität München, Emil-Ramann-Straße 6, 85354 Freising, Germany
*
*Correspondence E-mail: jkollmann@wzw.tum.de

Abstract

Invasive alien plants often occur in monospecific stands with high density in the invaded range. Production of bioactive secondary metabolites in such stands could have allelopathic effects on germination of native species. We tested this component of the novel weapon hypothesis for Heracleum mantegazzianum, a prominent invader in Europe, using seeds of 11 native herbs exposed to soil or soil extracts from invaded stands, moist seeds or seed extracts of H. mantegazzianum. There was no effect of the various treatments on germination of most species, while germination was reduced in Urtica dioica on invaded soil, in Poa trivialis with H. mantegazzianum seed extract, and negative effects of the essential oil bergapten were found in three species. In P. trivialis the results of the seed extract were not supported by the experiment with added seeds of the invasive plant. Thus, there is limited evidence for allelopathic effects of the invasive H. mantegazzianum on germination of co-occurring native herbs.

Type
Short Communication
Copyright
Copyright © Cambridge University Press 2013 

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