NDLI: Risk assessment of non-target effects caused by releasing two exotic phytoseiid mites in Japan: can an indigenous phytoseiid mite become IG prey?

Content Provider	Springer Nature Link
Author	Sato, Yukie Mochizuki, Atsushi
Copyright Year	2011
Abstract	Two exotic phytoseiid mites, Neoseiulus cucumeris and Amblyseius swirskii, are commercially available in Japan for the control of thrips and other pest insects. As part of a risk assessment of the non-target effects of releasing these two species, we investigated intraguild predation (IGP) between these exotic phytoseiid mites and an indigenous phytoseiid mite Gynaeseius liturivorus, which is promising as an indigenous natural enemy for the control of thrips in Japan. To understand IGP relations between the exotic and indigenous phytoseiid mites after use of the exotic mites for biological control, we investigated IGP between them in the absence of their shared prey. When an IG prey was offered to an IG predator, both exotic and indigenous females consumed the IG prey at all immature stages (egg, larva, protonymph, deutonymph), especially at its larval stages. The propensity for IGP in a no-choice test was measured by the survival time of IG prey corrected using the survival time of thrips offered to the IG predator. There was no significant difference in the propensity for IGP between N. cucumeris and G. liturivorus, but the propensity was significantly higher in A. swirskii than G. liturivorus. The propensity for IGP in a choice test was measured by the prey choice of the IG predator when a conspecific and a heterospecific larva were offered simultaneously as IG prey. Both exotic females consumed the heterospecific larva only. The indigenous female preferentially consumed the heterospecific larva when the heterospecific larva was N. cucumeris, but consumed the conspecific larva when the heterospecific larva was A. swirskii. We concluded that further investigation would be necessary for the exotic mites’ risk assessment, since the propensity for IGP of the two exotic females was similar to or higher than that of the indigenous female in both the no-choice and choice tests.
Starting Page	319
Ending Page	329
Page Count	11
File Format	PDF
ISSN	01688162
Journal	Experimental & Applied Acarology
Volume Number	54
Issue Number	4
e-ISSN	15729702
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-04-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Intraguild predation Intra-specific predation Risk assessment Gynaeseius liturivorus Neoseiulus cucumeris Amblyseius swirskii Animal Ecology Entomology Animal Systematics/Taxonomy/Biogeography Life Sciences Animal Genetics and Genomics
Content Type	Text
Resource Type	Article
Subject	Ecology Medicine Insect Science

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