Variation in scototaxis and orientation adaptation of Talitrus saltator populations subjected to different ecological constraints
Scapini, F. (1997). Variation in scototaxis and orientation adaptation of Talitrus saltator populations subjected to different ecological constraints. Est., Coast. and Shelf Sci. 44(2): 139-146. dx.doi.org/10.1006/ecss.1996.0205
In: Estuarine, Coastal and Shelf Science. Academic Press: London; New York. ISSN 0272-7714; e-ISSN 1096-0015, more
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| Keywords |
Amphipoda [WoRMS]; Talitridae Rafinesque, 1815 [WoRMS]
Marine/Coastal |
| Author keywords |
Amphipoda; Talitridae; orientation; scototaxis; rhythms; Mediterranean shores; Atlantic shores |
| Abstract |
This study focuses on the wayTalitrussaltator, a common inhabitant of the eulittoral zone of sandy shores, responds to landscape features, and highlights behavioural variations among natural populations from shores subject to differentecologicalconstraints. Mediterranean and Atlantic talitrid populations show differences in orientation, zonation and spontaneous migration on the beach, all of which are related to differences in tidal amplitude. In particular, Mediterranean sandhoppers migrate towards the dune for feeding, whereas Atlantic sandhoppers feed downshore on fresh wrack. In constant experimental conditions, a black stripe covering a sector of the horizon produced scototaxis with rhythmic changes in the sign and intensity, which are related to variations in migratory behaviour in the field. When the scototaxis of laboratory-born juveniles is compared to the behaviour of sandhoppers in the field, it can be inferred that the species-specific responses, as well as the talitrids' adaptation to their natural situation, derive from both individual experience and evolution. |
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