However, U. thayeri Žunlike species previously used. establishes burrows in the
lower intertidal zone under a mangrove canopy ŽCrane, 1975.. Many burrows are
flooded regardless of tidal amplitude. Release sites are also shaded and Žbecause flooded
burrows at high tide are found among mangrove roots. visually AcomplexB. These
ecological differences led us to speculate that compared to other Uca species, the
hatching rhythms of U. thayeri should be less sensitive to tidal amplitude Žas suggested
by Morgan and Christy, 1995.. We also predicted that under a mixed tidal regime,
hatching would still occur at night because the larvae are vulnerable to predators.