delayed emergence

[Nick Bowles]

Hi everyone,
there seems some evidence this year that a few individuals of several species (here in the UK) have delayed emergence and eventually emerged up to 2 weeks after they normally have finished a brood.  Essentially species normally ending broods in late June were seen in mid July. 
Does anyone know of any study of the ability of larvae to delay their development in response to adverse conditions?  It is worth saying that overall temperatures in May and June, were probably higher than usual but there was less sunshine in many places.  Is a percentage of each species able to delay until better weather?
Best wishes,
Nick Bowles
Conservation Officer (UTB/Butterfly Conservation)
94 Miswell Lane, Tring, Herts. HP23 4EX
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