Discrimination of inclined path segments by the desert ant Cataglyphis fortis

Discrimination of inclined path segments by the desert ant Cataglyphis fortis
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沙漠蚁 Cataglyphis fortis 对倾斜路径段的识别

DOI:
10.1007/s00359-012-0714-5
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发表时间:
2012
期刊:
Journal of Comparative Physiology A
影响因子:
--
通讯作者:
Ronacher B
Ronacher B
中科院分区:
--
文献类型:
--
作者:
Wintergerst;Ronacher B

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沙漠蚂蚁(Cataglyphisfortis)通过路径整合来导航,即使在起伏的地形中也能准确地执行任务。它们能够正确地计算巢穴和喂食器之间的地面距离,即使它们的觅食行程导致它们在波纹表面上。当蚂蚁在斜面上行走时,要计算出相应的地面投影,它们必须足够精确地测量斜面的坡度,但它们是如何做到这一点的还不清楚。使用一种新的行为分析,包括负强化,我们研究了如何以及不同的斜坡区分蚂蚁。训练蚂蚁通过固定倾斜度的斜坡(使用五种训练倾斜度:0°、15°、30°、45°、60°)访问高架喂食器。蚂蚁辨别出一个更陡的测试斜坡,与训练斜坡相差12.5°。发现这种区分性能对于0°和45°之间的训练斜率是恒定的。然而,在60°斜坡上训练的蚂蚁并不能区分所有陡峭的斜坡,直到垂直上升,从60°倾斜。这种歧视的准确性在路径整合过程中的错误的后果进行了讨论。
Desert ants (Cataglyphis fortis) navigate by means of path integration, and perform accurately even in undulating terrain. They are able to correctly calculate the ground distance between nest and feeder even if their foraging excursion leads them over corrugated surfaces. To compute the respective ground projection when walking over an inclined surface, ants must measure its slope with sufficient accuracy—but how they do so is still not understood. Using a new behavioural assay that included a negative reinforcement, we investigated how well different slopes are discriminated by the ants. Ants were trained to visit an elevated feeder, via a ramp of fixed inclination (five training inclinations were used: 0°, 15°, 30°, 45°, 60°). The ants discriminated a steeper test slope that differed from the training slope by 12.5°. This discrimination performance was found to be constant for training slopes between 0° and 45°. Ants trained on a 60° slope, however, did not discriminate all steeper slopes, up to a vertical ascent, from the 60° inclination. The consequences of this discrimination accuracy for errors in the path integration process are discussed.
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