Plant Biol (Stuttg) 2004; 6(2): 231-238
DOI: 10.1055/s-2004-817846
Original Paper

Georg Thieme Verlag Stuttgart · New York

Above- and Belowground Trophic Interactions on Creeping Thistle (Cirsium arvense) in High- and Low-Diversity Plant Communities: Potential for Biotic Resistance?

T. M. Bezemer1 , O. Graça2 , P. Rousseau2 , W. H. van der Putten1 , 2
  • 1Netherlands Institute of Ecology (NIOO-KNAW), Centre for Terrestrial Ecology, Heteren, The Netherlands
  • 2Laboratory of Nematology, Wageningen University, PO Box 8123, 6700 ES Wageningen, The Netherlands
Further Information

Publication History

Publication Date:
26 March 2004 (online)

Abstract

The capacity of local communities to control introduced plants is called biotic resistance. Biotic resistance has been almost exclusively tested for plant competition and aboveground herbivores and pathogens, while neglecting root herbivores and soil pathogens. Here, we present biotic resistance by above- and belowground herbivores in concert, and relate the abundance of the plant enemies to the species diversity of the local plant communities. The study was carried out in a 7-year-old biodiversity field experiment. We used creeping thistle (Cirsium arvense) as a model, and quantified sap-sucking herbivores: aboveground aphids, their antagonists, and root-feeding nematodes. As plant diversity treatments, we used field plots sown with high (15 plant species, HSD) or low (4 plant species, LSD) diverse seed mixtures in 1996 and that were not weeded. Creeping thistle became established spontaneously at the start of the experiment. In 2002, in HSD plots, 90 % of the plant community was made up by 11 species, compared to seven species in LSD plots. No differences were found for C. arvense abundance or biomass. Aboveground, three aphid species were found on C. arvense-Uroleucon cirsii, Aphis fabae, and Macrosiphum euphorbiae, but the latter was found only in low densities. Significantly more aphid species were found on individual plants in HSD plots. Moreover, in HSD plots, on average 10 % of aphids were parasitized, while no parasitism was observed in LSD plots. In the root zone of C. arvense, significantly more nematodes were found in HSD than in LSD plots, and a significantly higher proportion of those nematodes were plant parasites. The dominant plant parasitic nematode in both treatments was Paratylenchus. We conclude that biotic resistance by natural enemies may be enhanced by plant species diversity, but that above- and belowground sap-sucking herbivores do not necessarily have to respond similarly to the diversity of the surrounding plant community.

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T. M. Bezemer

Netherlands Institute of Ecology
Centre for Terrestrial Ecology

P.O. Box 40

6666 ZG Heteren

The Netherlands

Email: m.bezemer@nioo.knaw.nl

Section Editor: M. C. Ball

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