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| Content Provider | Springer Nature Link |
|---|---|
| Author | Harwood, James D. Yoo, Ho Jung S. Greenstone, Matthew H. Rowley, Daniel L. O’Neil, Robert J. |
| Copyright Year | 2008 |
| Abstract | Generalist predators have the capacity to regulate herbivore populations through a variety of mechanisms, but food webs are complex and defining the strength of trophic linkages can be difficult. Molecular gut-content analysis has revolutionized our understanding of these systems. Utilizing this technology, we examined the structure of a soybean food web, identified the potential for adult and immature Orius insidiosus (Hemiptera: Anthocoridae) to suppress Aphis glycines (Hemiptera: Aphididae), and tested the hypotheses that foraging behaviour would vary between life stages, but that both adults and immatures would exert significant predation pressure upon this invasive pest. We also identified the strength of trophic pathways with two additional food items: an alternative prey item, Neohydatothrips variabilis (Thysanoptera: Thripidae), and an intraguild predator, Harmonia axyridis (Coleoptera: Coccinellidae). A. glycines constituted a greater proportion of the diet of immature O. insidiosus, but N. variabilis DNA was found in greater frequency in adults. However, both life stages were important early-season predators of this invasive pest, a phenomenon predicted as having the greatest impact on herbivore population dynamics and establishment success. No adult O. insidiosus screened positive for H. axyridis DNA, but a low proportion (2.5%) of immature individuals contained DNA of this intraguild predator, thus indicating the existence of this trophic pathway, albeit a relatively minor one in the context of biological control. Interestingly, approximately two-thirds of predators contained no detectable prey and fewer than 3% contained more than one prey item, suggesting the possibility for food limitation in the field. This research implicates O. insidiosus as a valuable natural enemy for the suppression of early-season A. glycines populations. |
| Starting Page | 895 |
| Ending Page | 903 |
| Page Count | 9 |
| File Format | |
| ISSN | 13873547 |
| Journal | Biological Invasions |
| Volume Number | 11 |
| Issue Number | 4 |
| e-ISSN | 15731464 |
| Language | English |
| Publisher | Springer Netherlands |
| Publisher Date | 2008-07-09 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Aphis glycines Food web ecology Immature generalist predators Molecular gut-content analysis Predator-prey interactions Developmental Biology Ecology Plant Sciences Freshwater & Marine Ecology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ecology Ecology, Evolution, Behavior and Systematics |
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