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Solvent extraction of cues in the dust and frass of Prostephanus truncatus and analysis of behavioural mechanisms leading to arrestment of the predator Teretrius nigrescens

Solvent extraction of cues in the dust and frass of Prostephanus truncatus and analysis of behavioural mechanisms leading to arrestment of the predator Teretrius nigrescens

Stewart-Jones, A., Hodges, Rick, Farman, Dudley I. and Hall, David R. (2006) Solvent extraction of cues in the dust and frass of Prostephanus truncatus and analysis of behavioural mechanisms leading to arrestment of the predator Teretrius nigrescens. Physiological Entomology, 31 (1). pp. 63-72. ISSN 0307-6962 (doi:10.1111/j.1365-3032.2005.00488.x)

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Abstract

Teretrius nigrescens is a predatory beetle released into Africa for classical biological control of Prostephanus truncatus, currently the most serious insect
pest of stored maize on the continent. T. nigrescens is arrested by the dust and frass produced by P. truncatus boring into maize and it has been concluded that
this effect is most likely to be caused by chemicals in the dust/frass. A bioassay is presented in which EthoVision software (Noldus Information Technology, the
Netherlands) captures and analyses the movement of individual insects within arenas containing zones to which solvent extracts are applied. The results demonstrate
that cues enabling adult T. nigrescens to discriminate between maize flour and dust/frass are extractable in hexane, methanol and chloroform, but not water.
Such discrimination is manifested by an increase in residence time, distance covered and path sinuosity in the dust/frass zone. Analysis of behaviour demonstrates
cues that trigger inverse orthokinetic mechanisms contributing to arrestment in adult T. nigrescens. An increase in angular velocity would also suggest a
direct klinokinetic component, although this parameter could be affected by postulated tropotactic and/or transverse klinotactic and/or longitudinal klinotactic
mechanisms occurring at the edge of the application zone. Development of this bioassay, for the first time, permits responses of larval T. nigrescens to prey cues
to be assessed. The results show that larvae apparently respond to cues extracted from dust/frass in a stronger manner than adults, with significant increases in the
same descriptive parameters of time, distance and path sinuosity. However, unlike in the adults, there is no orthokinesis. It is proposed that strong larval response is
attributable to either direct klinokinesis and/or tropotaxis interacting with transverse
klinotaxis. Observations of larval backtracking at the zone boundary may also indicate longitudinal klinotaxis. The reasons for the differences in the adult
and larval response to prey cues are considered, and how the described behavioural mechanisms combine to improve prey foraging is discussed

Item Type: Article
Uncontrolled Keywords: Arrestant, arrestment, Bostrichidae, Histeridae, kairomone, kinesis, kinetic, larva, larvae, predator, Prostephanus truncatus, tactic, taxis, Teretrius nigrescens
Subjects: S Agriculture > S Agriculture (General)
Q Science > QL Zoology
S Agriculture > SB Plant culture
Faculty / Department / Research Group: Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Food & Markets Department
Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department
Related URLs:
Last Modified: 11 Nov 2011 12:06
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/3203

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