Genetic variability in the reactive distance inTrichogramma brassicae after automatic tracking of the walking path |
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Authors: | E B A W Bruins E Wajnberg and G A Pak |
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Institution: | (1) Unité de Biologie des Populations, I.N.R.A. Laboratoire de Biologie des Invertébrés, 37, Bld du Cap, 06600 Antibes, France;(2) Centre for Agriculture and Environment, P.O. Box 10015, 3505 AA Utrecht, The Netherlands |
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Abstract: | Efficiency of hymenopterous parasitoids to control pests in a biological control release program probably increases with increasing
searching ability of the females, which, in return, likely depends on the distance from which females perceive their hosts
(i.e., reactive distance). In this study, we first analyse this hypothesis with the help of a stochastic model simulating
the walking path of isolatedTrichogramma females during their searching behaviour. Then, this reactive distance is estimated using automatic recording and analysis
of the walking path of female wasps. Finally, the genetic variability for this trait is analysed in aTrichogramma brassicae Bezdenko (Hym.; Trichogrammatidae) population. Three types of hosts were used: Eggs ofEphestia kuehniella Zeller (Lep.; Pyralidae), eggs ofMamestra brassicae L. (Lep.; Noctuidae) and 0.45 mm glass beads.M. brassicae eggs are perceived from 4.01±0.15 mm, which is a significantly longer perceptive distance than forE. kuehniella eggs (3.69±0.10 mm) and glass beads (3.67±0.10 mm). Moreover, whatever the host tested, a significant genetic variation is
observed in this trait in the population studied.
The ecological and evolutionary implications and the agronomical importance of these results are discussed. |
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Keywords: | reactive distance walking path analysis Trichogramma genetic variability Ephestia kuehniella Mamestra brassicae glass beads simulation model |
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