Nest Architecture and Nesting Site Preference of Tetragonula iridipennis Smith in North-Western Plains of India

Stingless bees constitute an important group of bee diversity providing a vital ecological service i.e. pollination. From India, nine species of stingless bees have been reported out of which Tetragonula iridipennis Smith is widely distributed. Studies revealed that the majority (86.67%) of these bees’ nests were present in brick walls and the remaining (13.33%) were in cavities of hollow tree trunks. Most of the colonies nested at a height of 3.50 m from the ground. Most of the nests (56.67%) had entrances oriented to the east. No distinct entrance tube was observed in 26.92 per cent of the colonies. Overall average entrance tube dimensions (longer side diameter × shorter side diameter × tube length) were 11.62 × 11.73 × 14.04 mm. In all the nests, brood area was surrounded by pollen pots and a few honey pots. The mean dimensions (depth × width) of brood cells, honey pots and pollen pots were 2.79 × 2.62 mm, 5.33 × 4.52 mm and 6.93 × 5.19 mm, respectively. All of the sixty colonies whether in brick/stone walls or in hollow tree trunks overwintered successfully. Our results can be useful for developing conservation measures for T. iridipennis and its augmentation for crop pollination.