Predation of the miteHypoaspis aculeiferon the springtailFolsomia fimetariaand the influence of sex, size, starvation, and poisoning

Entomologia Experimentalis et Applicata - Tập 118 Số 1 - Trang 61-70 - 2006
Erik Baatrup1, Mark Bayley1, Jørgen Aagaard Axelsen2
1Institute of Biological Sciences, Department of Zoophysiology, Building 131, University of Aarhus, DK‐8000 Aarhus C, Denmark;
2The National Environmental Research Institute, Department of Terrestrial Ecology, PO Box 314, Vejlsøvej 25, DK‐8600 Silkeborg, Denmark

Tóm tắt

AbstractShort‐range predator–prey interactions among small soil‐dwelling arthropods are poorly understood. In this study, we measured the behavioural interactions between the predacious miteHypoaspis aculeiferCanestrini (Gamasida: Laelapidae) and its collembolan preyFolsomia fimetariaL. (Collembola: Isotomidae) and the influence of sex, size, starvation, and poisoning with the organophosphate dimethoate. Pairs of mite and springtail were placed in 18‐mm diameter test arenas with a plaster of Paris substrate and their behaviour were measured by a computerized vision system, which automatically detected the locomotory activity of the two animals, their encounters, and the precise time of capture and killing. Data suggest that neither the mite nor the springtail possesses near‐field sensory detection of the opponent. A Cox regression model showed that mite sex, size ratio between the predator and prey, average mite velocity, and encounter rate had a significant influence on the mite‐capture efficiency (springtail survival). FemaleH. aculeiferdemonstrated higher capture efficiency than males by catching and killing their prey after fewer encounters. Surprisingly, starvation had only a moderate effect on the mite locomotory behaviour and no influence on the capture efficiency as such. Also, springtail survival was independent of its moulting stage. Sublethal poisoning with dimethoate, on the other hand, dramatically increased the mite's capture rate, probably by impeding the evasive response of the springtail.

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Entomologia Experimentalis et Applicata

Tập 118 Số 1

61-70

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