Lasioglossum calceatum (Scopoli,1763)

Distribution

Found throughout Britain, from the Isles of Scilly and Kent north to the north coast of the Scottish mainland. Also found in the Channel Islands, the Isle of Man and parts of Ireland

Found across the Palaearctic region from Britain to Japan, reaching north to northern Finland. In the south of its range, it is mostly montane, occurring up to 1800 metres: Iberia, south to Serra Estrela; Corsica; Italy, Monte Pollino; the high mountains of Greece south to Taygetos; north-east Turkey but south to Toros, Bolkar Daglari (A W Ebmer, pers. comm.).

Status (in Britain only)

This species is not regarded as scarce or threatened.

Habitat

Found in most habitats, and can be abundant in more open, dry areas.

Flight period

The female is found on the wing from mid-March to early October and the male from late June to end October, at least in the south. In the northern part of the range the flight period may be partly contracted.

Nesting biology

This is a primitively eusocial mining bee in the southern part of its range. In northerly latitudes it may be solitary. The nest is constructed in short turf or other open situations in the sun, but seems not to be found in large aggregations. The nest is usually founded by one female but rarely more than one are found. Here the dominant individual, usually the largest, becomes the queen and the others then serve as workers. In the more typical situation, the lone foundress female digs the length of all the main burrow, which is almost vertical. She then constructs a short lateral tunnel some distance from the bottom, which leads to a comb-like cell cluster surrounded by an air chamber. The lone female builds 4–7 cells, in which she rears smaller workers with under-developed ovaries and sometimes one or two males. The workers take over the foraging, helping rear a brood of males and sexual females. In the south of its range, there may be two broods of workers (Plateaux-Quénu, 1992).

Flowers visited

The females and males will visit a wide variety of flowers for nectar.

Parasites

There are no known Sphecodes specifically cleptoparasitic on Lasioglossum calceatum, although more generalist Sphecodes may parasitise this species.

Author of profile

G W Allen.

Year profile last updated

2016