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Photoperiod Length and the Chronometric Mechanism of the Sun Compass in Mediterranean Sandhoppers

Published online by Cambridge University Press:  11 May 2009

A. Ugolini
Affiliation:
Dipartimento di Biologia Animale e Genetica, Università di Firenze, Via Romana 17, 1–50125 Firenze, Italy. E-mail: [email protected]
F. Frittelli
Affiliation:
Dipartimento di Biologia Animale e Genetica, Università di Firenze, Via Romana 17, 1–50125 Firenze, Italy.

Extract

The chronometric mechanism of compensation for the apparent movement of the sun was investigated in adult individuals of Talitrus saltator (Amphipoda: Talitridae) from Mediterranean latitudes. The individuals were subjected to alteration of the duration of illumination, while its phase remained the same as in nature. A close relation between photoperiod length and the chronometric mechanism of the sun compass was observed, which could explain the seasonal adaptation of the sun compass. We propose an alternative to the classic hypothesis of daily differential compensation for the apparent movement of the sun.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1998

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