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When the beachhopper looks at the moon: The moon compass hypothesisThe function of moon position for shoreline orientation by talitrids is investigated. Three major results were found: (1) Observed cases of compensation for changes in the direction of the moon are based on physiological rhythm with a period of about 25 hours which can persist for at least several days under constant conditions. (2) The zeitgeber for physiological rhythm may be either moonlight or some other factor associated with the tides. (3) If talitrids are long removed from environmental entrainment, either artifically or naturally, the internal rhythm no longer exerts an appreciable influence on the angle of lunar orientation; in such cases the system deteriorates into constant angle orientation, with an angle which is determined by the beach orgin, but may be modified by lighting conditions.
Document ID
19720017445
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Enright, J. T. (Scripps Institution of Oceanography San Diego, CA, United States)
Date Acquired
August 6, 2013
Publication Date
January 1, 1972
Publication Information
Publication: NASA, Washington Animal Orientation and Navigation
Subject Category
Biosciences
Accession Number
72N25095
Funding Number(s)
CONTRACT_GRANT: NSF GB-5471
CONTRACT_GRANT: NSF GB-2469
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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