Behavioural adaptations in talitrids from two Atlantic beaches

TitleBehavioural adaptations in talitrids from two Atlantic beaches
Publication TypeJournal Article
Year of Publication2009
AuthorsRossano, C, Gambineri S, Fanini L, Durier V, Rivault C, Scapini F
JournalEstuarine, Coastal and Shelf Science
Volume85
Issue4
Pages573 - 584
Keywordsbehavioural variability, circadian rhythms, orientation behaviour, Sandy beaches, Talitrus saltator, tides
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. © 2009 Elsevier Ltd. All rights reserved.

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