NDLI: Shifts in natural enemy assemblages resulting from landscape simplification account for biocontrol loss in wheat fields

Content Provider	Springer Nature Link
Author	Zhao, Zi Hua Sandhu, Hardev S. Gao, Feng He, Da Han
Copyright Year	2015
Abstract	In recent decades, landscape simplification due to agricultural intensification has resulted in biocontrol loss within agroecosystems leading to an increase in pest outbreaks. Empirical experiments have focused on the relationship between landscape pattern and the abundance of specific species. However, fewer studies have examined the varied responses of multiple natural enemy modules to landscape simplification. In the present study, 23 landscapes were examined to determine the effects of landscape simplification on cereal aphids and their natural enemies. Results showed that landscape simplification can increase cereal aphid populations with no significant effects on the total abundance of natural enemies. For each natural enemy module, it was found that the abundance of parasitic wasps was greatly increased by landscape simplification while the abundance of ground-dwelling predators was significantly reduced. In contrast, the abundance of leaf-dwelling predators was not significantly altered by landscape simplification. Therefore, the varied response of the three natural enemy modules to landscape simplification can result in major fluctuations in natural enemy–pest ratios and ultimately disrupt the top-down control of natural predators and biocontrol services within agroecosystems. In conclusion, quantitative food-web analysis could be a promising technique in clarifying the varied response of the three natural enemy modules to landscape pattern changes and species-specific abundance, a field of biological pest control that requires further study.
Starting Page	493
Ending Page	498
Page Count	6
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	30
Issue Number	3
e-ISSN	14401703
Language	English
Publisher	Springer Japan
Publisher Date	2015-02-04
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Agricultural intensification Food-web analysis Habitat management Landscape changes Parasitic wasp Ecology Plant Sciences Zoology Evolutionary Biology Behavioral Sciences Forestry
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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