Brimstone update

I’ve been keeping an eye on the brimstone ova laid on Friday and they have changed colour a little from the almost translucent white (almost a contradiction in term) to a turquoise white whilst from a distance, now I have my eye in well and truly to locating ‘my’ ova, they appear more ‘colourful’ than when first laid but that might be the influence of the light?  Interestingly, there is a second example of three ova where initially this was a pair laid by a single female.

150426 Brimstone 3 ova 40039

Both the images illustrate examples where three ova are present and in both instances the first two were laid by the same female.  An addition was noticed on the same day and the second example was found two days later.

150426 G rhamni 3 ova hrk 40042

F W Frowhawk records in 1934 in his book The Complete Book of British Butterflies that after coming out of hibernation during the first warm days of March the butterfly comes out and after a long dalliance the female generally deposits its eggs towards the end of May or during the first half of June.  UK Butterflies likewise offers the second week in May so I can only assume that the recent observation is another example of response to change in climate / phenology in action?  There appears no disagreement in the literature that I should expect to wait around ten days for the ova to hatch into a larva.  If the literature is true to record then there should be noticeable changes occuring over the coming weekend.  Let’s hope that the weather is kind or the early ovum might not benefit from a head start this season unless the vanguard also adopted a staged approach to their ovipositing.



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