期刊
ESTUARINE COASTAL AND SHELF SCIENCE
卷 85, 期 4, 页码 573-584出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ecss.2009.09.029
关键词
Talitrus saltator; sandy beaches; orientation behaviour; circadian rhythms; tides; behavioural variability
资金
- Galileo Project (Italy-France cooperation)
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 degrees, Ille et Vilaine, Brittany, France) and a population from Damgan (orientated to 195 degrees, 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. (C) 2009 Elsevier Ltd. All rights reserved.
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