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First published online November 17, 2006
Journal of Experimental Biology 209, 4747-4750 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02573

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Magnetic compass in the cornea: local anaesthesia impairs orientation in a mammal

Regina E. Wegner^*, Sabine Begall and Hynek Burda

Department of General Zoology, Institute for Biology, University of Duisburg-Essen, Campus Essen, Universitätsstraße 5, 45141 Essen, Germany

View larger version (50K): [in a new window]   Fig. 1. Ferrous inclusions as indicated by arrows in the corneal epithelium of Fukomys anselli after Prussian blue staining.

View larger version (9K): [in a new window]   Fig. 2. Random nest distribution of mole-rats under corneal anaesthesia. Triangles indicate mean nesting directions of the repeatedly tested six pairs in control (A) and under anaesthesia (B), and nesting directions of the singular tested group in control (C; N=42) and treatments (D; N=40). The arrows, proportional to the outside radius (=1), mark the grand mean vector based on the pairs' mean directions (A,B) or the mean vector of all single decisions (C,D). The inner circles mark the Rayleigh significance thresholds: 5% (broken) and 1% (solid) in A, B; 1% (broken) and 0.1% (solid) in C, D. Table 1 gives numerical values.