Effects of silk web on the locomotor activities of spider mites
(2014) xiv International congress of acarology ( July 2014) — Location: Kyoto, Japan (14.July.2014)
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- The two-spotted spider mite Tetranychus urticae is a silk producer known to live in groups. Its silk production plays an important role in protection against external aggressions (predators, rains, etc.). It is also used during collective migration by ballooning or as a dragline during individual migration by walking. Until now, the role of silk in enhancing migration has been poorly studied. In this paper, the influence of the silk thread presence on T. urticae ’s locomotor activity is studied. One virgin female is placed at the centre of a cover glass partially covered by silk. Moving and resting time are studied on the silk or the clean part of the cover glass as a function of the starvation level of mites (fed vs. starved) and the age of the silk (30 vs. 60 vs. 90 vs. 120 vs. 150 min). Results show that a fed female spends more time on the silk-covered part than on the clean part as long as the silk is fresh (less than 120 min). Thus, the age-related changes in chemical and/or physical properties of the silk influence the spatial distribution of fed mites. Whatever the age of the silk, starved mites spend more time on the clean part of the set-up. Indeed, the silk freshly laid by conspecifics is attractive only for fed mites; starved mites probably prefer sites without silk (and conspecifics). This study shows that that the silk influences the spatial distribution of T. urticae according to its level of starvation and that silk is probably is an indicator of the presence of conspecifics. In this context, we have also studied the locomotor activity i.e. time in movement, in resting, and in static exploration (probing behaviour) of an individual confronted to clean places and/or places covered by silk coming from its own population or from another. Two populations were tested, one of the red form (Tunisia) and another of the green form (Belgium). The experimental results showed that the presence or the absence of silk did not influence the relative proportion of each behavioural item either for the red or the green population. Individuals of the green form population spent more time moving and less time resting than individuals of the red form population and this, whatever the substrate (red/green silk, clean). Moreover, the silk from the red form population attracted individuals from both populations, whereas the silk produced by the green form population did not attract any individual either from the red or the green form. This surprising result might have been due to a difference in the quantity and/or quality of silk woven by the two forms. We discuss how the differences observed in the behaviour of these two populations may result from differences in their strategy to rapidly increase the population of the colony and reinforce the silk nest.
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Le Goff, G., Hance, T., Detrain, C., Deneubourg, J.-L., Clotuche, G., & Mailleux, A.-C. (2014). Effects of silk web on the locomotor activities of spider mites. xiv International congress of acarology ( July 2014), Kyoto, Japan. https://hdl.handle.net/2078.5/191388