Local honeybee lines — landrace and heritage subspecies adapted over centuries to a particular climate and forage — can be lost forever when a colony collapses from disease, starvation, or a queen failure. Conservation breeders counter this by keeping a gene bank: reserve queens, semen straws, or nucleus colonies holding each rare line, ready to restock an apiary the moment a colony is lost.
Programmes like the UK's Bee Improvement and Bee Breeders' Association and Ireland's Native Irish Honey Bee Society maintain isolated mating apiaries and cryopreserved semen banks specifically to stop rare native Apis mellifera mellifera stock from being diluted or lost after regional colony losses.
A ring of apiary hives, each carrying a distinct rare genetic line, surrounds a central gene bank vault. Colonies risk collapse every generation; when the gene bank is switched on, reserve queens fly out to restock lost hives and rebuild genetic diversity before a line is lost forever.
Genetic diversity in a population of colonies erodes as hives collapse. A gene bank reserve — cryopreserved queens or semen for each rare line — lets breeders reintroduce a lost line before it disappears everywhere, exactly as real conservation apiaries do.
Adjust collapse risk and restock chance, toggle the gene bank on or off, and watch the diversity index and lost-lines counter respond. Use "Force a collapse" to stress-test recovery, or turn the gene bank off to see how quickly rare lines vanish without it.
Conservation breeding groups maintain isolated mating apiaries and cryopreserved semen banks specifically to protect native honeybee subspecies from being diluted or wiped out after regional colony losses.