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A population ecological host- parasite model is used to evaluate the potential impact of clonal parasitic laying workers of the Cape honeybee, Apis mellifera capensis on populations of Apis mellifera scutellatahost colonies in apiaries and in the wild. The model includes three basic life his- tory parameters: reproductive rate of the host colonies, transmission efficiency of the parasite and the death rate of parasitised colonies. The population dynamics of host and parasites are computed for 100 generations after an initial infestation with parasitic workers. The model reveals that infestations are likely to be fatal for apiary populations irrespective of beekeeping activities compensating for col- ony losses due to parasitation. Wild A. m. scutellatapopulations are however less likely to be affected by parasitic laying workers and stable equilibria between host and parasite occur over a wide range of the parameter space. Although it is unlikely that the parasitic clone represents a threat to the conserva- tion of biodiversity, even low frequencies of parasitic A. m. capensisworkers in wild honeybee popu- lation can cause a permanent threat to beekeeping activities. Cape honeybee / Apis mellifera capensis / parasitic worker / population model / biodiversity / apiculture

Population dynamics of the Cape bee phenomenon: The impact of parasitic laying worker clones in apiaries and natural populations