Nesting biology and life cycle of Nomia (Acunomia) chalybeata Smith on Iriomote Island, southernmost Archipelago of Japan, with notes on the simultaneous occurrence of diapausing and non-diapausing prepupae within the same nests (Hymenoptera: Halictidae)

A groundbreaking discovery in the nesting biology of the bee species Nomia (Acunomia) chalybeata Smith on Iriomote Island, Japan, reveals a unique strategy for survival across varying climatic zones. The study found that this bee produces both diapausing and non-diapausing prepupae simultaneously within the same nests, with the rate of diapausing prepupae increasing towards the later activity season. This dual production mechanism suggests an adaptive response to environmental conditions, potentially allowing the species to inhabit a wider range of climates. The research also documented the nesting period from late April to October, with nest densities reaching up to 20 nests per square meter in clay soil under shady conditions. Communal nests were observed, containing brood clusters with varying numbers of cells, indicating independent provisioning by cohabitants. Additionally, the study estimated at least two, and possibly three, generations per year, with a notable female ratio of approximately 34.7% in the overwintered generation.

Abdul Hannan, Md., Maeta, Y., & Miyanaga, R. (2013). Nesting biology and life cycle of Nomia (Acunomia) chalybeata Smith on Iriomote Island, southernmost Archipelago of Japan, with notes on the simultaneous occurrence of diapausing and non-diapausing prepupae within the same nests (Hymenoptera: Halictidae). Journal of the Saudi Society of Agricultural Sciences, 12(2), 91–99. https://doi.org/10.1016/j.jssas.2012.08.002