Behavioural adaptations in talitrids from two Atlantic beaches |
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| Authors: | Claudia Rossano Simone Gambineri Lucia Fanini Virginie Durier Colette Rivault Felicita Scapini |
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| Institution: | 1. Dipartimento di Biologia Evoluzionistica “Leo Pardi”, Università di Firenze, Via Romana, 17 – 50125 Florence, Italy;2. UMR 6552, Ethologie Animale et Humaine, CNRS-Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France |
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| Abstract: | The aim of the present study was to test sun orientation and rhythmic activity of two sandhopper populations from two Atlantic macro-tidal beaches. A population from Le Verger beach (orientated to 346°, Ille et Vilaine, Brittany, France) and a population from Damgan (orientated to 195°, Morbihan, Brittany, France), were tested on the beach under clear sky discriminating for landscape vision. For both populations locomotor activity rhythm was recorded in the laboratory. The two beaches differed for climatic features, tidal range and for human use. Both talitrid populations resulted very well orientated toward the shoreline, and both used solar position and landscape vision to orient. However the multiple regression analysis of orientation with climatic features showed a different use of local cues by the two populations and a slight influence of tidal regime (ebbing and rising tide), in spite of the supralittoral zonation of sandhoppers. In the laboratory they showed a well defined rhythmic behaviour as well as a bimodal rhythmicity, explained as a tidal one. These results are a new brick in the complex picture of orientation and rhythm studies on sandy beach invertebrates. |
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| Keywords: | Talitrus saltator sandy beaches orientation behaviour circadian rhythms tides behavioural variability |
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