Lasioglossum zephyrus

(Smith, 1853)

Zephyr Sweat Bee

Lasioglossum zephyrus is a small sweat bee in the Halictidae, native to the United States and Canada. The exhibits primitively eusocial with flexible social organization—colonies may contain multiple females with overlapping , or females may nest solitarily. Nests are constructed in soil burrows, often in of up to 1,000 nests along south-facing stream banks. Males are slightly larger than females, with brighter metallic green coloration and redder .

Lasioglossum zephyrus by no rights reserved, uploaded by Adam Kranz. Used under a CC0 license.

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Lasioglossum zephyrus by (c) Thilina Hettiarachchi, some rights reserved (CC BY), uploaded by Thilina Hettiarachchi. Used under a CC-BY license.

Pronunciation

How to pronounce Lasioglossum zephyrus: /ˌlæsiˈoʊɡlɒsəm ˈzɛfɪrəs/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from other Lasioglossum by combination of dark green metallic color, reddish , and relatively hairy . Males identified by brighter green coloration and redder abdomen compared to females. identification ( vs. ) requires behavioral observation—queens push subordinates down in nest and nudge them to suppress . The has been frequently misspelled 'zephyrum' in older literature.

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Habitat

Nests in soil burrows, typically constructed in April along south-facing edges of streams. Nests occur in up to 1,000 individuals. Excavation occurs primarily at night but has been observed throughout the day. are lined with secretions from enlarged . Older females may contribute to burrowing if nests are destroyed.

Distribution

United States and Canada. Documented throughout the United States; specific range boundaries not well-defined in available sources.

Seasonality

Active March through October. Nest establishment occurs in April. Colony maximum size reached around August. Inseminated young queens overwinter in nests to initiate next year's colonies.

Diet

provision larvae with pollen collected from diverse flowering plants. Adults do not adjust pollen quantity based on protein content of different pollen types. Has been observed forcing open unbloomed flowers of Xyris tennesseensis to extract pollen, securing first access.

Life Cycle

Females excavate burrows and construct lined with glandular secretions. Young females establish nests solitarily or in groups in spring. If colonies expand, they reach 10–20 individuals by August. Colony growth is gradual through summer. Inseminated young queens overwinter; overwintered queens typically die early in summer. replacement occurs within hours of death. Colonies have high mortality, especially when solitary without guards.

Behavior

Primitively eusocial with maintained by behavioral suppression. Queens push into burrow depths, preventing foraging and large ovary development. Aggression decreases with time and is lower among more closely related nestmates. Workers may forage, guard, and construct ; queens cease pollen collection and cell construction after first worker . Males disperse from natal nests within 2 days, form swarms around nest clusters, and patrol specific routes. Males sleep solitarily or in small groups in holes, plants, or abandoned burrows. Nestmate recognition occurs via individually distinctive odors learned by both sexes.

Ecological Role

of diverse flowering plants. Soil excavator contributing to soil turnover in nesting . to multiple including , gregarine protozoa, kleptoparasitic Lasioglossum cephalotes, and mutillid Pseudomethoca frigida. Guard bees defend nests by blocking entrances with while one attacks intruders.

Human Relevance

Occasionally attracted to human sweat for salts and minerals, like other halictid bees. Capable of stinging but generally not aggressive; sting described as mild by most sources, though individual reactions vary. Contributes to pollination of native plants. Frequently captured in bowl traps used for monitoring, potentially skewing diversity estimates.

Similar Taxa

Lasioglossum hemichalceumSimilar size and halictid , but exhibits egalitarian with no aggression and cooperative care by all reproductive females—behaviorally distinct from L. zephyrus
Other Lasioglossum (Dialictus) speciesMany small metallic halictids overlap in general appearance; L. zephyrus distinguished by hairier , reddish , and specific nesting
Halictus ligatusAlso primitively eusocial halictid with similar social flexibility, but differs in coloration (typically banded rather than metallic green-red) and facial hair

Misconceptions

Frequently misspelled 'zephyrum' in scientific literature—this is an error, not a valid synonym. Social organization is often oversimplified; the is facultatively solitary-eusocial, not obligately social, with considerable variation between nests.

More Details

Social polymorphism

The exhibits remarkable flexibility in social organization, with some nests remaining permanently solitary while others develop into multi-female colonies with reproductive division of labor. This variation is not genetically fixed but appears to depend on environmental and demographic factors during nest founding.

Mating system

Approximately 18% of mate successfully between June and August. Workers are less receptive to mating when queens are present. Females produce an aphrodisiac/sex attractant odor between ages 2–8 days. Copulation lasts 10–42 seconds and occurs with male positioned above female.

Parasite defense

When threatened by , L. zephyrus attempts to decapitate the attacker rather than sting. This unusual defense has been documented against the mutillid Pseudomethoca frigida, which typically retreats when faced with this response.