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Desert ants do not acquire and use a three-dimensional global vector.
Frontiers in Zoology ( IF 2.8 ) Pub Date : 2007-05-04 , DOI: 10.1186/1742-9994-4-12
Gunnar Grah 1 , Rüdiger Wehner , Bernhard Ronacher
Affiliation  

BACKGROUND Desert ants (Cataglyphis fortis) are central place foragers that navigate by means of path integration. This mechanism remains accurate even on three-dimensional itineraries. In this study, we tested three hypotheses concerning the underlying principles of Cataglyphis' orientation in 3-D: (1) Do the ants employ a strictly two-dimensional representation of their itineraries, (2) do they link additional information about ascents and descents to their 2-D home vector, or (3) do they use true 3-D vector navigation? RESULTS We trained ants to walk routes within channels that included ascents and descents. In choice tests, ants walked on ramps more frequently and at greater lengths if their preceding journey also included vertical components. However, the sequence of ascents and descents, as well as their distance from nest and feeder, were not retraced. Importantly, the animals did not compensate for an enforced vertical deviation from the home vector. CONCLUSION We conclude that Cataglyphis fortis essentially represents its environment in a simplified, two-dimensional fashion, with information about vertical path segments being learnt, but independently from their congruence with the actual three-dimensional configuration of the environment. Our findings render the existence of a path integration mechanism that is functional in all three dimensions highly unlikely.

中文翻译:

沙漠蚂蚁不获取和使用三维全局矢量。

背景技术沙漠蚂蚁(Cataglyphis fortis)是通过路径整合导航的中心觅食者。即使在三维行程中,该机制仍然保持准确。在这项研究中,我们测试了关于3-D中Cataglyphis定位的基本原理的三个假设:(1)蚂蚁是否使用严格的二维路线表示;(2)蚂蚁是否链接了有关上升和下降的其他信息到他们的2-D主向量,还是(3)他们使用真正的3-D矢量导航?结果我们训练了蚂蚁在包括上升和下降的渠道内行走的路线。在选择测试中,如果蚂蚁之前的旅程也包含垂直分量,则它们会更频繁地走在斜坡上,并且走得更长。但是,上升和下降的顺序以及它们与巢和饲养者的距离,没有被追溯。重要的是,动物没有补偿从原始矢量强制的垂直偏差。结论我们得出的结论是,Cataglyphis fortis本质上以简化的二维方式表示了其环境,学习了有关垂直路径段的信息,但独立于它们与环境的实际三维配置的一致性。我们的发现使路径整合机制在所有三个方面都起作用的可能性极小。但独立于它们与环境的实际三维配置的一致性。我们的发现使路径整合机制在所有三个方面都起作用的可能性极小。但独立于它们与环境的实际三维配置的一致性。我们的发现使路径整合机制在所有三个方面都起作用的可能性极小。
更新日期:2019-11-01
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