Summary
Tiger salamanders (Ambystoma tigrinum) trained to orient in a particular compass direction under the sun fail to orient in the trained direction if they are (i) eyeless and simultaneously have the brain covered with opaque plastic or are (ii) eyeless and pinealectomized (Fig. 1–2, Table 1). Salamanders with either the eyes or the pineal intact and unobstructed continue to orient in the trained direction. These data strongly support the hypothesis that the pineal body is an effective extraocular photoreceptor (EOP) for compass orientation in tiger salamanders.
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We thank M.P. Farrell for developing computer programs for data analysis. B. Bailey and R. Walton helped conduct tests. Financial support was provided for separate phases of this research by a Biomedical Science Support Grant (NIH FR 07033-05) and NSFgrants GB-30647 and BMS 75-18693 to K. Adler and an Indiana Academy of Science Research Grant, a postdoctoral fellowship (NSF GU-2058), a Miami University Research Grant and an NSF grant (GB-41102) to D.H. Taylor.
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Taylor, D.H., Adler, K. The pineal body: Site of extraocular perception of celestial cues for orientation in the tiger salamander (Ambystoma tigrinum). J. Comp. Physiol. 124, 357–361 (1978). https://doi.org/10.1007/BF00661385
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DOI: https://doi.org/10.1007/BF00661385