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The role of large-scale spatially explicit and small-scale localized processes on the population dynamics of cereal aphids

Published online by Cambridge University Press:  09 March 2007

L. Winder*
Affiliation:
Department of Biology, University of the South Pacific, Suva, Fiji
G.J.K. Griffiths
Affiliation:
Department of Biological Sciences, University of Plymouth at Seale-Hayne, Newton Abbot, Devon, TQ12 6NQ, UK
J.N. Perry
Affiliation:
Plant and Insect Ecology Division, Rothamsted-Research, Rothamsted, Harpenden, Herts, AL5 2JQ, UK
C.J. Alexander
Affiliation:
Plant and Insect Ecology Division, Rothamsted-Research, Rothamsted, Harpenden, Herts, AL5 2JQ, UK
J.M. Holland
Affiliation:
The Game Conservancy Trust, Fordingbridge, Hants, SP6 1EF, UK
P.J. Kennedy
Affiliation:
Syngenta, Ecological Sciences, Jealott's Hill International Research Centre, Bracknell, Berks, RG42 6EY, UK
A. Birt
Affiliation:
Syngenta, Ecological Sciences, Jealott's Hill International Research Centre, Bracknell, Berks, RG42 6EY, UK
*
*Fax: 00 (679) 3231513 E-mail: winder_l@usp.ac.fj

Abstract

A field-scale study of the spatially explicit interaction between the carabid Poecilus cupreus Linnaeus, and two common aphid species (Sitobion avenae (Fabricius) and Metopolophium dirhodum (Walker)) in winter wheat was conducted. All three species showed considerable spatial pattern at the field scale. Activity-density of P. cupreus was an order of magnitude higher in the central part of the field compared to its periphery. Where P. cupreus activity-density was highest, S. avenae and M. dirhodum population peaks were delayed. Additionally, in the case of M. dirhodum, lower maximum counts were evident where P. cupreus activity-density was highest. An analysis of the movement of individual P. cupreus using release–recapture indicated that those beetles within the centre of the field exhibited reduced displacement, which may have caused the generation or maintenance of spatial pattern. Crop density was also measured throughout the field. Although crop density had no large-scale spatial pattern, its variability at the small-scale was consistent with an influence on aphid population dynamics. This study demonstrates empirically that both large-scale spatially explicit and small-scale localized processes influenced aphid population dynamics simultaneously.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2005

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