Advanced

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

Caballero-Lopez, B.; Bommarco, R.; Blanco-Moreno, J. M.; Sans, F. X.; Pujade-Villar, J.; Rundlöf, Maj LU and Smith, Henrik LU (2012) In Biological Control 63(2). p.222-229
Abstract
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,... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cereal aphids, Aphid-predator interaction, Biological control, Specialist predators, Generalist predators, Landscape complexity
in
Biological Control
volume
63
issue
2
pages
222 - 229
publisher
Elsevier
external identifiers
  • wos:000310766300021
  • scopus:84867638533
ISSN
1090-2112
DOI
10.1016/j.biocontrol.2012.03.012
project
BECC
language
English
LU publication?
yes
id
393d901d-7634-4a67-b968-7687900396a1 (old id 3259289)
date added to LUP
2012-12-27 09:09:44
date last changed
2017-12-10 03:26:32
@article{393d901d-7634-4a67-b968-7687900396a1,
  abstract     = {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.},
  author       = {Caballero-Lopez, B. and Bommarco, R. and Blanco-Moreno, J. M. and Sans, F. X. and Pujade-Villar, J. and Rundlöf, Maj and Smith, Henrik},
  issn         = {1090-2112},
  keyword      = {Cereal aphids,Aphid-predator interaction,Biological control,Specialist predators,Generalist predators,Landscape complexity},
  language     = {eng},
  number       = {2},
  pages        = {222--229},
  publisher    = {Elsevier},
  series       = {Biological Control},
  title        = {Aphids and their natural enemies are differently affected by habitat features at local and landscape scales},
  url          = {http://dx.doi.org/10.1016/j.biocontrol.2012.03.012},
  volume       = {63},
  year         = {2012},
}