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Talorchestia tricornuta Shoemaker (Amphipoda, Talitridae) from Sandy Shores of Gabon: Compass Mechanisms of Orientation

Authors

  • Alberto Ugolini,

    Corresponding author
    1. Dipartimento di Biologia Animate e Genetica, Università di Firenze, Centre SFET, CNR, Firenze, and Institut de Recherche en Ecologie Tropicale, CeNaReST, Université Omar Bongo, Libreville
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  • Barbara Vignali,

    1. Dipartimento di Biologia Animate e Genetica, Università di Firenze, Centre SFET, CNR, Firenze, and Institut de Recherche en Ecologie Tropicale, CeNaReST, Université Omar Bongo, Libreville
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  • Paul Posso

    1. Dipartimento di Biologia Animate e Genetica, Università di Firenze, Centre SFET, CNR, Firenze, and Institut de Recherche en Ecologie Tropicale, CeNaReST, Université Omar Bongo, Libreville
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Corresponding author: A. Ugolini, Dipartimento di Biologia Animale e Genetica, Università di Firenze, Via Romana 17, I-50125 Firenze, Italy, E-mail: Ugolinialb@dbag.unifi.it

Abstract

We studied the capacity for zonal recovery in an equatorial sandhopper, Talorchestia tricornuta, inhabiting the sandy beaches of equatorial West Africa. These beaches are often narrow and backed by an evident landscape. The sky usually has heavy cloud cover. The experiments were performed both in a confined environment and in the field, in full sun or an overcast sky, with the magnetic field natural, deviated or absent T. tricornuta was able to assume the correct direction using the sun and magnetic field as orienting factors. Moreover, the releases in the field with the natural landscape visible indicate that the landscape may constitute a further important orienting factor in zonal recovery.

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