Direct and indirect effects of egg parasitism by Neopolycystus Girault sp. (Hymenoptera: Pteromalidae) on Paropsis atomaria Olivier (Coleoptera: Chrysomelidae)

M P Duffy; Helen F Nahrung; Simon A Lawson; Anthony R Clarke

doi:10.1111/j.1440-6055.2008.00657.x

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Direct and indirect effects of egg parasitism by Neopolycystus Girault sp. (Hymenoptera: Pteromalidae) on Paropsis atomaria Olivier (Coleoptera: Chrysomelidae)

Journal article

Peer reviewed

Direct and indirect effects of egg parasitism by Neopolycystus Girault sp. (Hymenoptera: Pteromalidae) on Paropsis atomaria Olivier (Coleoptera: Chrysomelidae)

M P Duffy, Helen F Nahrung, Simon A Lawson and Anthony R Clarke

Australian Journal of Entomology, Vol.47(3), pp.195-202

2008

DOI: https://doi.org/10.1111/j.1440-6055.2008.00657.x

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Abstract

eucalypt

parasitoid

paropsine

Neolycystus sp. is the only primary egg parasitoid associated with the pest beetle Paropsis atomaria in subtropical eucalypt plantations, but its impact on its host populations is unknown. The simplified ecosystem represented by the plantation habitat, lack of interspecific competition for host and parasitoid, and the multivoltinism of the host population makes this an ideal system for quantifying the direct and indirect effects of egg parasitism, and hence, effects on host population dynamics. Within-, between- and overall-egg-batch parasitism rates were determined at three field sites over two field seasons, and up to seven host generations. The effect of exposure time (egg batch age), host density proximity to native forest and water sources on egg parasitism rates was also tested. Neopolycystus sp. exerts a significant influence on P. atomaria populations in Eucalyptus cloeziana. plantations in south-eastern Queensland, causing the direct (13%) and indirect (15%) mortality of almost one-third of all eggs in the field. Across seasons and generations, 45% of egg batches were parasitised, with a within-batch parasitism rate of around 30%. Between-batch parasitism increased up to 5-6 days after oviposition in the field, although within-batch parasitism rates generally did not. However, there were few apparent patterns to egg parasitism, with rates often varying significantly between sites and seasons.

Details

Title: Direct and indirect effects of egg parasitism by Neopolycystus Girault sp. (Hymenoptera: Pteromalidae) on Paropsis atomaria Olivier (Coleoptera: Chrysomelidae)
Authors: M P Duffy (Author) - Queensland University of Technology
Helen F Nahrung (Author) - Queensland University of Technology
Simon A Lawson (Author) - Department of Primary Industries & Fisheries
Anthony R Clarke (Author) - Queensland University of Technology
Publication details: Australian Journal of Entomology, Vol.47(3), pp.195-202
Publisher: Wiley-Blackwell Publishing Asia
Date published: 2008
DOI: 10.1111/j.1440-6055.2008.00657.x
ISSN: 1326-6756
Organisation Unit: University of the Sunshine Coast, Queensland; Forest Industries Research Centre; Forest Research Institute
Language: English
Record Identifier: 99450228102621
Output Type: Journal article

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