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Patch size effects are more important than genetic diversity for plant-herbivore interactions in Brassica crops
Stockholm University, Faculty of Science, Department of Botany.
Stockholm University, Faculty of Science, Department of Botany.
2010 (English)In: Ecological Entomology, ISSN 0307-6946, E-ISSN 1365-2311, Vol. 35, no 3, 299-306 p.Article in journal (Refereed) Published
Abstract [en]

2. This paper examines the effect of intraspecific genetic diversity within Brassica fields on two Brassica specialists, cabbage root fly, and diamondback moth, and on a parasitoid attacking diamondback moths. Genetic diversity was manipulated both in a replacement and an additive design. 3. Both herbivore densities and parasitism rates were higher in smaller plots, with limited responses to increased within-plot diversity. All species showed variable densities across genotypes, and preference hierarchies were species specific. 4. Responses to plot size in root flies scaled with the diameter-to-area ratio, suggesting that patch detectability affected local density, whereas responses by diamondback moths and parasitoids deviated from this ratio. These species differences could be traced to differences in the residence time within patches, where diamondback moths typically spend longer and more variable time periods in patches than root flies. 5. The lack of response to genetic diversity by both herbivores suggests that egg-laying rates are affected by decisions on the plant and not by attraction from a distance, neither to the plant itself nor the patch. Patterns of differential attack may then be due to different acceptability for studied genotypes. 6. Future theories on insect responses to spatial heterogeneity should focus on species traits and how traits interact with information landscapes in the field.

Place, publisher, year, edition, pages
2010. Vol. 35, no 3, 299-306 p.
Keyword [en]
Delia radicum, Diadegma, intercropping, intraspecific diversity, patch size, Plutella xylostella
National Category
Biological Sciences
URN: urn:nbn:se:su:diva-49928DOI: 10.1111/j.1365-2311.2010.01186.xISI: 000277290000005OAI: diva2:379981
authorCount :3Available from: 2010-12-20 Created: 2010-12-20 Last updated: 2010-12-20Bibliographically approved

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Hamback, Peter A.
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