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Intraguild predation between Harmonia axyridis and the hoverfly Episyrphus balteatus

Brecht Ingels (UGent) and Patrick De Clercq (UGent)
Author
Organization
Abstract
Whereas Harmonia axyridis has frequently been reported as an intraguild predator of other Coccinellidae, little is known about its interactions with other aphidophagous predators, including syrphids. This study investigated the incidence, direction and magnitude of intraguild predation (IGP) between H. axyridis and Episyrphus balteatus in Petri dish arenas with leaf disks on agar. The interactions were examined between larvae, pupae and adults, both in the absence and presence of Acyrthosiphon pisum as an extraguild prey. IGP between H. axyridis and E. balteatus was asymmetric, with the coccinellid in the majority of cases being the IG predator and the syrphid the IG prey. In the absence of extraguild prey, first instars of E. balteatus were most sensitive to IGP, as they were killed by all stages of H. axyridis. Second and third instars of the syrphid were only killed by older larvae and adults of the coccinellid. Pupae of either species were not attacked. In the presence of extraguild prey, the frequency of IGP was substantially reduced. Further research using larger arenas is needed to get a more reliable view on the interactions between these predators.
Keywords
Episyrphus balteatus, IGP, Intraguild predation, Harmonia axyridis

Citation

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MLA
Ingels, Brecht, and Patrick De Clercq. “Intraguild Predation between Harmonia Axyridis and the Hoverfly Episyrphus Balteatus.” IOBC/WPRS Harmonia Meeting, Abstracts, International Organisation for Biological and Integrated Control of Noxious Animals and Plants (IOBC). West Palaeartic Regional Section (WPRS), 2009.
APA
Ingels, B., & De Clercq, P. (2009). Intraguild predation between Harmonia axyridis and the hoverfly Episyrphus balteatus. IOBC/WPRS Harmonia Meeting, Abstracts. Presented at the IOBC/WPRS Harmonia meeting : Harmonia axyridis and other invasive ladybirds, Engelberg, Switzerland.
Chicago author-date
Ingels, Brecht, and Patrick De Clercq. 2009. “Intraguild Predation between Harmonia Axyridis and the Hoverfly Episyrphus Balteatus.” In IOBC/WPRS Harmonia Meeting, Abstracts. International Organisation for Biological and Integrated Control of Noxious Animals and Plants (IOBC). West Palaeartic Regional Section (WPRS).
Chicago author-date (all authors)
Ingels, Brecht, and Patrick De Clercq. 2009. “Intraguild Predation between Harmonia Axyridis and the Hoverfly Episyrphus Balteatus.” In IOBC/WPRS Harmonia Meeting, Abstracts. International Organisation for Biological and Integrated Control of Noxious Animals and Plants (IOBC). West Palaeartic Regional Section (WPRS).
Vancouver
1.
Ingels B, De Clercq P. Intraguild predation between Harmonia axyridis and the hoverfly Episyrphus balteatus. In: IOBC/WPRS Harmonia meeting, Abstracts. International Organisation for Biological and Integrated Control of Noxious Animals and Plants (IOBC). West Palaeartic Regional Section (WPRS); 2009.
IEEE
[1]
B. Ingels and P. De Clercq, “Intraguild predation between Harmonia axyridis and the hoverfly Episyrphus balteatus,” in IOBC/WPRS Harmonia meeting, Abstracts, Engelberg, Switzerland, 2009.
@inproceedings{1010152,
  abstract     = {{Whereas Harmonia axyridis has frequently been reported as an intraguild predator of other Coccinellidae, little is known about its interactions with other aphidophagous predators, including syrphids. This study investigated the incidence, direction and magnitude of intraguild predation (IGP) between H. axyridis and Episyrphus balteatus in Petri dish arenas with leaf disks on agar. The interactions were examined between larvae, pupae and adults, both in the absence and presence of Acyrthosiphon pisum as an extraguild prey. 
IGP between H. axyridis and E. balteatus was asymmetric, with the coccinellid in the majority of cases being  the IG predator and the syrphid the IG prey. In the absence of extraguild prey, first instars of E. balteatus were most sensitive to IGP, as they were killed by all stages of H. axyridis. Second and third instars of the syrphid were only killed by older larvae and adults of the coccinellid. Pupae of either species were not attacked. In the presence of extraguild prey, the frequency of IGP was substantially reduced. Further research using larger arenas is needed to get a more reliable view on the interactions between these predators.}},
  author       = {{Ingels, Brecht and De Clercq, Patrick}},
  booktitle    = {{IOBC/WPRS Harmonia meeting, Abstracts}},
  keywords     = {{Episyrphus balteatus,IGP,Intraguild predation,Harmonia axyridis}},
  language     = {{eng}},
  location     = {{Engelberg, Switzerland}},
  publisher    = {{International Organisation for Biological and Integrated Control of Noxious Animals and Plants (IOBC). West Palaeartic Regional Section (WPRS)}},
  title        = {{Intraguild predation between Harmonia axyridis and the hoverfly Episyrphus balteatus}},
  year         = {{2009}},
}