Locomotor activity rhythm and sun compass orientation in the sandhopper <Emphasis Type="Italic">Talitrus </Emphasis><Emphasis Type="Italic">saltator</Emphasis> are related |
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Authors: | Alberto Ugolini Silvia Somigli Vittorio Pasquali Paolo Renzi |
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Institution: | (1) Dipartimento di Biologia Animale e Genetica, Università di Firenze, Florence, Italy;(2) Dipartimento di Psicologia, Sezione di Neuroscienze, Università di Roma “La Sapienza”, Rome, Italy |
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Abstract: | The sandhopper Talitrus saltator has an endogenous activity rhythm with a circadian periodicity. It is well known for its ability to compensate for the apparent
movement of the sun during its migrations along the sea–land axis of the beach. Both chronometric mechanisms are entrained
by the natural LD photoperiod. Using actographic recordings and tests of solar orientation of individuals kept under an LD
12:12 clock-shifted cycle, after 1–13 days of treatment, we demonstrate that the timing mechanism of activity rhythm and the
chronometric mechanism underlying the sun compass are the same. |
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Keywords: | Talitrus saltator Activity rhythm Orientation Sun compass Chronometric mechanism |
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