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Interspecific competition between the nematode-trapping fungus, Duddingtonia flagrans, and selected microorganisms and the effect of spore concentration on the efficacy of nematode trapping

Published online by Cambridge University Press:  12 April 2024

J. Grønvold ,
J. Wolstrup ,
M. Larsen ,
A. Gillespie  and
F. Giacomazzi
J. Grønvold*
Affiliation:
Section of Zoology, Department of Ecology, Royal Veterinary and Agricultural University, 40 Thorvaldsensvej, DK-1871, Frederiksberg, C, Denmark
J. Wolstrup
Affiliation:
Section of Microbiology, Department of Ecology, Royal Veterinary and Agricultural University, 40 Thorvaldsensvej, DK-1871, Frederiksberg, C, Denmark
M. Larsen
Affiliation:
Danish Center for Experimental Parasitology, Department of Veterinary Microbiology, Royal Veterinary and Agricultural University, 100 Dyrlægevej, DK-1870, Frederiksberg, C, Denmark
A. Gillespie
Affiliation:
Chr. Hansen A/S, Bøge Allé 10–12, 2970, Hørsholm, Denmark
F. Giacomazzi
Affiliation:
Section of Microbiology, Department of Ecology, Royal Veterinary and Agricultural University, 40 Thorvaldsensvej, DK-1871, Frederiksberg, C, Denmark
*
*Author for correspondence Fax: +45 35 28 26 76 Email: jrg@kvl.dk
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Abstract

The fungus, Duddingtonia flagrans, is able to trap and kill free-living nematode larvae of the cattle parasite Cooperia oncophora when chlamydospores are mixed in cattle faeces. Isolates of Bacillus subtilis (two isolates), Pseudomonas spp. (three isolates) and single isolates of the fungal genera Alternaria, Cladosporium, Fusarium, Trichoderma and Verticillium were isolated from cattle faeces and shown to reduce D. flagrans growth on agar plates. When these isolates were added to cattle faeces containing D. flagrans and nematode larvae of C. oncophora, developing from eggs, none of the isolates reduced nematode mortality attributed to D. flagrans. Similarly, the coprophilic fungus Pilobolus kleinii, which cannot be cultivated on agar, also failed to suppress the ability of D. flagrans to trap and kill developing larvae of C. oncophora. Increasing chlamydospore doses of D. flagrans in faecal cultures resulted in higher nematode mortality. Thus, no evidence of interspecific or intraspecific competition was observed. The consequences of these findings are discussed.

Type
Review Article
Information
Journal of Helminthology , Volume 78 , Issue 1 , March 2004 , pp. 41 - 46
Copyright
Copyright © Cambridge University Press 2004

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