Journal of comparative physiology

, Volume 136, Issue 3, pp 243–246 | Cite as

Extraretinal mediation of responses to temperature and light in hatchling alligators

  • Martin Kavaliers


Hatchling American alligators (Alligator mississippiensis) possess functional retinal and extraretinal (non-pineal) photoreceptors. The threshold energy required to obtain a positive phototactic reponse is directly dependent on temperature (5–37 °C) in alligators perceiving light (i) retinally and extraretinally and, (ii) in animals perceiving light extraretinally only. In animals receiving only retinal light inputs, the temperature dependence of phototactic orientation is eliminated. This provides the first demonstration that extraretinal photoreception is involved in the mediation of temperature dependent light responses.


Threshold Energy Light Response Light Input American Alligator Alligator Mississippiensis 
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Copyright information

© Springer-Verlag 1980

Authors and Affiliations

  • Martin Kavaliers
    • 1
  1. 1.Department of Zoology and EntomologyColorado State UniversityFort CollinsUSA

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