The distribution of Talitrus saltator, Talorchestia deshayesii and Tal
orchestia ugolinii in Corsica has been investigated. T. saltator occur
s on almost all the coasts of Corsica, T. ugolinii only on the central
part of the east coast, whilst T. deshayesii only on the west. Tests
for solar orientation, textural choice, survival in the water, and rep
roduction rate show a higher ecological valency in T. saltator than in
the other two species, which could explain its widespread distributio
n.