NDLI: Presence of an unsuitable host diminishes the competitive superiority of an insect parasitoid: a distraction effect

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Presence of an unsuitable host diminishes the competitive superiority of an insect parasitoid: a distraction effect

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Population Ecology : Volume 49, Issue 3, July 2007

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Presence of an unsuitable host diminishes the competitive superiority of an insect parasitoid: a distraction effect

Content Provider	Springer Nature Link
Author	Meisner, Matthew Harmon, Jason P. Ives, Anthony R.
Copyright Year	2007
Abstract	Competitive interactions between parasitoid species are traditionally evaluated when they compete for a single host species. Yet, the presence of additional host species can alter competitive interactions, even if the host is unsuitable for parasitoid development. In alfalfa of the mid-western USA, a native parasitoid species, Praon pequodorum, was once a dominant natural enemy, but it has become rare since the introduction of another parasitoid, Aphidius ervi. Despite A. ervi’s competitive superiority for their most common host, the pea aphid Acyrthosiphum pisum, P. pequodorum still persists at low densities. We performed a suite of laboratory and field studies to determine if the presence of an alternative host, the spotted alfalfa aphid Therioaphis maculata, may mitigate A. ervi’s competitive superiority and facilitate P. pequodorum’s persistence. We show that spotted alfalfa aphids reduce the foraging efficiency of both parasitoid species for pea aphids, despite spotted alfalfa aphids being an unsuitable host. This decrease in efficiency, however, was not symmetrical; the presence of spotted alfalfa aphids had a greater detrimental effect on A. ervi foraging for pea aphids. This might facilitate the persistence of the competitively inferior P. pequodorum. Our study suggests that indirect effects generated by the presence of alternative hosts are important for understanding parasitoid–host dynamics and overall insect community structure.
Starting Page	347
Ending Page	355
Page Count	9
File Format	PDF
ISSN	14383896
Journal	Population Ecology
Volume Number	49
Issue Number	4
e-ISSN	1438390X
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-06-29
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Host suitability Indirect effects Parasitoid foraging behavior Pea aphids Shared predation Spotted alfalfa aphids Forestry Behavioural Sciences Evolutionary Biology Plant Sciences Zoology Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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