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| Wittlinger, M., Wolf, H., Wehner, R.: (2007): |
id 35 |
| Hair plate mechanoreceptors associated with body segments are not necessary for three-dimensional path integration in desert ants, Cataglyphis fortis |
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Abstract:
In formicine ants, the hair fields associated with the
neck and the petiole (alitrunk–petiole and petiole–gaster
joints) have long been established to function in
graviception. Here, we examine a possible role of these
hair receptors in three-dimensional (3-D) path integration
of the (formicine) desert ant, Cataglyphis fortis. Cataglyphis
judge the ground distance when travelling over hills,
allowing correct homing even in (unpredictably) uneven
terrain. We eliminated the function of these hair sensors in
graviception either by shaving the hairs or by
immobilising the joints monitored by the hair plates. With
that major component of their sense of graviception
eliminated, one would expect the ants to disregard, or at
least misgauge, the ascents and descents performed across
hills during outbound journey. The ants should thus
consider the (much longer) actual walking trajectory,
instead of the base distance, when calculating their homing
distance. Surprisingly, neither shaving nor immobilisation
of the hair sensillae affected correct path integration,
across both uneven terrain (3-D) and level surface. If
anything, the ants underestimated homing distance, which
may reflect a general, safety-oriented navigation strategy.
Animals that had performed the outbound journey with
their gaster fixed in a horizontal position underestimated
their homing so dramatically that this latter explanation
cannot hold. |
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| Nørgaard, T., Henschel, J.R., Wehner, R. (2007): |
id 36 |
| Use of local cues in the night-time navigation of the wandering
desert spider Leucorchestris arenicola (Araneae, Sparassidae) |
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| Narendra A., Cheng K., Wehner R.: (2007): |
id 37 |
| Acquiring, retaining and integrating memories of the outbound distance in the
Australian desert ant Melophorus bagoti |
| The Journal of Experimental Biology 210, 570-577 |
| ABSTRACT |  | ZORA | |
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| Wehner, R.,Fukushi, T.,Isler, K.: (2007): |
id 38 |
| On Being Small: Brain Allometry in Ants |
| Brain Behav Evol 2007;69:220-228 |
| ZORA | |
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| Grah, G., Wehner, R. and Ronacher, B. (2007): |
id 88 |
| Desert ants do not acquire and use a three-dimensional vector. |
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| Hegedüs, R., Åkesson, S., Wehner, R. and Horvath, G. (2007): |
id 89 |
| Could Vikings have navigated under foggy and cloudy conditions by skylight polarization? On the atmospheric optical prerequisites of polarimetric Viking navigation under foggy and cloudy skies. |
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| Müller, M. and Wehner, R. (2007): |
id 90 |
| Wind and sky as compass cues in desert ant navigation |
| Naturwissenschaften (2007) 94, 589-594 |
| ABSTRACT | | ZORA | |
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| Wehner, R. (2007): |
id 91 |
| The desert ant's navigational toolkit: procedural rather than positional knowledge. |
| Proceedings of the 63rd Annual Meeting of the Institute of Navigation 2007:1-14, April 23 - 25, Cambridge, Massachusetts |
| ABSTRACT | ZORA | |
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| Wittlinger, M., Wehner, R. and Wolf, H. (2007): |
id 92 |
| The desert ant odometer: a stride integrator that accounts for stride length and walking speed. |
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imls/literature
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