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A 25pc increase in berry mass was recorded when African honeybees were the predominant insects visiting the flowers.
There are problems, however, with imported pollinators, which often diminish or even wipe out native pollinators: (i) European and (especially) African honeybees (Apis mellifera) in the New World (Kevan and Baker, 1998), Australia (Paton, 1993), and New Zealand; (ii) European bumblebees (especially Bombus terrestris) in Israel (Dafni and Shmida, 1996; Dafni, 1998), Japan (Asada and Ono, 1996), and New Zealand; and (iii) worldwide monocultures of European Megachile rotundata.
African honeybees escaped from a Brazilian agriculture research station in 1957 and began breeding with more docile European honeybees.
African honeybees present a high propensity for swarming, which can facilitate and accelerate the propagation of their mitochondrial DNA.

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