Re: Backfilling brood nest during requeening
When a queen has mated and is about ready to begin to lay the workers will empty cells of nectar and relocate that nectar to other areas of the hive. This is commonly called "drying" the cells and can easily be seen when looking at frames of nectar, the area of dry cells surrounded by cells full of nectar catch the eye.
It is up to the beekeeper to furnish the bees space to place the removed nectar by giving the bees a super, otherwise the bees just extend cells and create a "fat" area on the frame and place the nectar there. If no space is added then a congested brood nest will lead to swarming, so it can be a cause for concern.
42 + years - 24 colonies - IPM disciple - Naturally Skeptic