Flexibility in timing of the metamorphic molt by fiddler crab megalopae Uca pugilator

Abstract

Megalopae delayed molting unless two stimuli were present: an adult crab and sediment, either mud or sand. The metamorphic molt was advanced in the presence of both these cues, although contact with the sediment by the adult crab appears necessary for maximal effect. Flexibility in timing of molting and the requirement for >1 cue increase the chance that megalopae settle and molt to the first crab instar in appropriate adult habitats. -from Author