Bombus californicus

Smith, 1854

California bumble bee

Bombus californicus is a in the Apidae, placed in the subgenus Thoracobombus. It occurs in Central America and western North America. The species exhibits variable coloration, with females typically showing black coloration with a single yellow band on the and another near the abdominal apex, while males display greater variation. have declined significantly, with the species classified as Vulnerable by the IUCN.

Bombus californicus by (c) Pinnacles National Park, some rights reserved (CC BY), uploaded by Pinnacles National Park. Used under a CC-BY license.

Bombus (Fervidobombus) californicus by the Smithsonian. Used under a CC0 license.

Pronunciation

How to pronounce Bombus californicus: //ˈbɒmbəs ˌkælɪˈfɔːrnɪkəs//

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

Identification

Females typically display black coloration with a single prominent yellow band anteriorly on the and another single yellow band near the apex of the . Males exhibit considerably more variation in color pattern. The shares overlapping color patterns with its sister species Bombus fervidus, and in areas of geographic overlap, some individuals cannot be distinguished without genetic analysis. Each species can occasionally display the color pattern typical of the other.

Images

Habitat

Nests in the ground, in wooded areas, and in urban areas.

Distribution

Found in Central America and the western half of North America.

Seasonality

Queens emerge from April through mid-July. are present from April to September. Males occur from late May through September.

Diet

Pollinates sage, blueberry bushes, red clover, California poppies, and numerous other flowering plant .

Ecological Role

of diverse flowering plants including agricultural crops and native flora.

Human Relevance

Subject of conservation concern due to declines. A 2015 study found the endangered in 62% of surveyed areas. sampling in 2022 confirmed ongoing rapid population decline in California, with reduced occurrence in southern California compared to historical distribution. Proposed as a candidate for California state designation due to its native status and conservation needs.

Similar Taxa

Bombus fervidusSister with overlapping geographic range and color patterns; some individuals in areas of overlap require genetic analysis for positive identification, as each species can display the other's typical coloration.