The colonies of the giant honeybee (Apis dorsata) immigrate in the semiarid environment of Northwest India in October-November with the onset of flowering on pigeon pea (Cajanus cajan)/toria (Brassica campestris var. toria), stay here during the rich pollen and nectar flow period from December to mid-May, and emigrate in late May/early June when floral dearth is witnessed. This honeybee was free from any conspicuous viral, bacterial, and fungal diseases and also did not have any serious predators and enemies. However, about 20 percent of the old colonies were infested with Tropilaelaps clareae and 100 percent of the old colonies with Galleria mellonella; none of the swarm colonies had these pests. While the migration schedule of this honeybee remained similar year after year, the number of colonies immigrating in this region declined markedly over the years; the number in 2012 was even less than half of that recorded in 1984. During its stay in this region, this honeybee acted as an important pollinator of more than 30 crop plants of this region. The causes of seasonal migration and decline in the number of colonies of this honeybee and its importance in crop pollination have been discussed. 1. Introduction The giant honeybee (Apis dorsata F.) is a wild species indigenous to Pakistan, South Asia, and Southeast Asia [1] (Figure 1). This honeybee has a migratory habit; the colonies make seasonal migration. For the utilization of this honeybee as a pollinator and honey gatherer; knowledge about its seasonal migration schedules is important. Some earlier researchers studied the latter ecological phenomenon of the giant honeybee in the tropical climates of South and Southeast Asia [2–7]. The reports reveal that seasonal migration in this honeybee varied from place to place depending on the local climatic and floral conditions. In Sri Lanka, this honeybee had a regular annual cycle of migration [2]. In February, the colonies spread throughout the coastal plains and the North Central Region. In June and July, they migrated to the Up Country, which they left again in October-November. In Bangalore (India), this honeybee showed short and long distance migrations [3]. Short distance migrations seemed to be the local absconding occurred in response to internal disturbances in the colonies. The long distance migrations were the real migrations occurred due to floral dearth and inclement climatic conditions of the area [3]. Woyke et al. [4] too reported that swarms of the giant honeybee did not migrate directly to the seasonal alternative nesting sites but
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