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Aphids and their natural enemies are differently affected by habitat features at local and landscape scales

Author:
  • B. Caballero-Lopez
  • R. Bommarco
  • J. M. Blanco-Moreno
  • F. X. Sans
  • J. Pujade-Villar
  • Maj Rundlöf
  • Henrik Smith
Publishing year: 2012
Language: English
Pages: 222-229
Publication/Series: Biological Control
Volume: 63
Issue: 2
Document type: Journal article
Publisher: Elsevier

Abstract english

Biological control, an essential ecosystem service to agriculture, can be affected by ecological processes operating at landscape scales. Here we assessed the effect of landscape complexity, measured as proportion of arable land (PAL), on the abundance of aphids, parasitoids, and specialist and generalist predators. In addition we set up cage experiments to test the ability of these groups of enemies to suppress aphid densities. Landscape context did not significantly explain differences in aphid or parasitoid densities between fields. However, aphid densities were significantly higher in field interior compared to the margin. Coccinellid (specialist predator) abundance showed a similar pattern, with higher density in the field interior, indicating an aggregative response to aphid prey. In addition, Coccinellid abundance increased with PAL but only in field interiors and not at the field margins. The abundance of carabids (generalist predators) increased with PAL, suggesting that they benefit from landscape simplification. The cage experiment revealed that specialist as well as generalist predators were able to reduce the number of aphids on barley tillers and that a combination of both guilds did not provide a greater reduction of aphids. Our results suggest higher densities of generalist predators with increasing PAL Nonetheless, the greater abundance of coccinellids and carabid beetles in cereal fields embedded in simple landscapes does not necessarily imply better pest control since natural enemies may compete, thereby limiting their ability to control pests. (C) 2012 Elsevier Inc. All rights reserved.

Keywords

  • Ecology
  • Earth and Related Environmental Sciences
  • Cereal aphids
  • Aphid-predator interaction
  • Biological control
  • Specialist predators
  • Generalist predators
  • Landscape complexity

Other

Published
  • BECC
  • ISSN: 1090-2112
Henrik Smith
E-mail: henrik [dot] smith [at] biol [dot] lu [dot] se

Professor

Biodiversity

+46 46 222 93 79

+46 70 978 20 56

E-C313

50

Director

Centre for Environmental and Climate Research (CEC)

+46 46 222 93 79

+46 70 978 20 56

C313

Sölvegatan 37, Lund

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Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
Ecology building S-223 62 Lund Sweden