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Do subterranean mammals use the Earth’s magnetic field as a heading indicator to dig straight tunnels?

机译:地下哺乳动物是否利用地球磁场作为掘进直隧道的航向指示器?

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摘要

Subterranean rodents are able to dig long straight tunnels. Keeping the course of such “runways” is important in the context of optimal foraging strategies and natal or mating dispersal. These tunnels are built in the course of a long time, and in social species, by several animals. Although the ability to keep the course of digging has already been described in the 1950s, its proximate mechanism could still not be satisfactorily explained. Here, we analyzed the directional orientation of 68 burrow systems in five subterranean rodent species (Fukomys anselli, F. mechowii, Heliophobius argenteocinereus, Spalax galili, and Ctenomys talarum) on the base of detailed maps of burrow systems charted within the framework of other studies and provided to us. The directional orientation of the vast majority of all evaluated burrow systems on the individual level (94%) showed a significant deviation from a random distribution. The second order statistics (averaging mean vectors of all the studied burrow systems of a respective species) revealed significant deviations from random distribution with a prevalence of north–south (H. argenteocinereus), NNW–SSE (C. talarum), and NE–SW (Fukomys mole-rats) oriented tunnels. Burrow systems of S. galili were randomly oriented. We suggest that the Earth’s magnetic field acts as a common heading indicator, facilitating to keep the course of digging. This study provides a field test and further evidence for magnetoreception and its biological meaning in subterranean mammals. Furthermore, it lays the foundation for future field experiments.
机译:地下啮齿动物能够挖掘长而直的隧道。在最佳觅食策略和出生或交配分散的背景下,保持这种“跑道”的走行很重要。这些隧道是由许多动物在很长一段时间内建造的,并且是社会物种。尽管在1950年代已经描述了保持挖掘过程的能力,但其令人满意的机制仍无法令人满意地解释。在这里,我们在其他研究框架内绘制的详细洞穴系统图的基础上,分析了五个地下啮齿动物(Fukomys anselli,F。mechowii,Heliophobius argenteocinereus,Spalax galili和Ctenomys talarum)中68个洞穴系统的方向取向。并提供给我们。在单个级别上,所有评估的洞穴系统的绝大多数(94%)的方向都显示出与随机分布的显着偏离。二阶统计量(各个物种所有研究的洞穴系统的平均向量)显示出随机分布存在显着偏差,其分布范围为南北(H. argenteocinereus),NNW-SSE(C. talarum)和NE- SW(Fukomys-鼠)导向隧道。 S. galili的洞穴系统是随机定向的。我们建议将地球磁场作为共同的航向指示器,以利于保持挖掘过程。这项研究为地下哺乳动物的磁感受及其生物学意义提供了现场测试和进一步的证据。此外,它为将来的野外实验奠定了基础。

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