E-Fauna BC: Electronic Atlas of the Wildlife of British Columbia

Colias gigantea Fabricius, 1807
Giant Sulphur; Sulphurs
Family: Pieridae (Whites, Marbles, and Sulphurs)
Species account authors: Crispin Guppy and Jon Shepard.
Extracted from Butterflies of British Columbia
The Families of Lepidoptera of BC
Introduction to the Butterflies of BC

© Norbert Kondla  Email the photographer   (Photo ID #5018)

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Distribution of Colias gigantea in British Columbia.
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Species Information


Adult

Giant Sulphurs, the largest sulphur in BC, have yellow males and pale yellow to white females. The hindwing discal cell spot is very large on both the upper and lower hindwing, and usually has a satellite spot on the underside. There are no submarginal spots on the underside of the wings. Unlike in most sulphurs, on the upperside of the wings there is very little dark scaling at the wing bases.

Immature Stages

Undescribed.

Subspecies

The northwestern BC populations are the nominate subspecies C.g. gigantea Strecker, 1900 (TL: "west coast of Hudson Bay above Fort York, [Manitoba]"). Females are usually white (occasionally yellow) and males are a cold yellow with a narrow black wing border. Atlin populations have been called C. pelidne or C. interior by some authors. The northeastern BC populations are subspecies mayi F.& R. Chermock, 1940 (TL: Riding Mountains, MB), with females usually yellow (occasionally white) and males a warmer yellow than the nominate subspecies. Adults of subspecies mayi are much larger than those of subspecies gigantea.

Genus Description


Colias is the name of a promontory on the coast of Attica where there was a tem pie of Aphrodite. There is no obvious relationship to the butterfly, but the name may be a pun (Emmet 1991). An alternative explanation is suggested under Pontia. The common name "sulphurs" is derived from the yellow "sulphur" colour of most species.

Sulphurs in BC are generally medium-sized butterflies that are yellow, orange, white, or (one species) yellow green with black markings. The wings of males always have a solid black border, with the exception of the Arctic Sulphur. The black borders of females contain extensive pale areas, or may be greatly reduced or absent. There are several multivoltine species that show considerable seasonal variation in wing colour.

There are about 70 species of Colias in the world. The centre of distribution in North America is BC, with more species (13) than any other province or state. Colias species may all be inter-fertile, with natural hybrids known for most species combinations where they occur together in the wild. The species have behavioural, ecological, and physiological differences that maintain separation of the species in the wild (Hovanitz 1963).

Eggs are laid singly on the leaves of the foodplants, and are pale yellow green to cream, later turning orange. Young larvae are slender, yellowish or green, and smooth-skinned with a thin coat of fine hairs. Mature larvae are yellow green or green with fine black dots all over, and stripes of various colours running along the back and sides. Sulphurs hibernate as second to fourth instar larvae (except Canadian Sulphurs, which hibernate as fifth instar larvae), and then complete development in the spring. There are five larval instars in all Colias (Ae 1958a). Pupae are fastened head up with a girdle around the middle.

Members of the genus utilize a wide range of foodplants, although each species specializes to a greater or lesser extent. Larvae of sulphurs feed on plants in three groups: legumes (Fabaceae), Vaccinium (Ericaceae), and Salix (Salicaceae). Sulphurs occur in a wide range of habitats, including arid sagebrush areas, alfalfa fields, meadows, alpine tundra, and forest bogs.

Sulphurs always rest with their wings folded over their backs, and bask in the sun by leaning to the side to allow the sun to warm the underside of their wings. It has been demonstrated for several species (C. meadii, C. nastes, C. philodice, and C. eurytheme) that the darker the pigmentation on the underside of the wings, the more heat can be absorbed from the sun while basking, permitting greater flight activity in cold environments (Kingsolver 1985).

There is relatively little variation in wing pattern between many species, making identification difficult. The key characters mentioned in the species discussions are shown in the figure.

Biology


Giant Sulphurs are univoltine, and fly from late June through July. Near Nordegg, AB, oviposition occurred on several varieties of dwarf willows on hillocks in muskeg. The eggs hatched after 10 days and larval growth was slow, suggesting that the larvae hibernate (McDunnough 1922). In the Peace River region of Alberta, they are universally restricted to wet willow fens and catchment marshes with willows (Kondla et al. 1994).

The larval foodplants are various species of willow (McDunnough 1922). Oviposition on Salix reticulata at Churchill, MB, was observed by Klots (1975), who reared the resulting larvae to the third instar.

Habitat


Giant Sulphurs inhabit boreal willow fens in northern BC and in the Cariboo Region.

Distribution

Distribution

Giant Sulphurs occur from northern AK and YT, across southwestern NT and central and northern BC, to Hudson Bay and ON.

Status Information

Scientific NameOrigin StatusProvincial StatusBC List
(Red Blue List)
COSEWIC
Colias giganteaNativeS5YellowNot Listed
Colias gigantea giganteaNativeS3BlueNot Listed
Colias gigantea mayiNativeS5YellowNot Listed
BC Ministry of Environment: BC Species and Ecosystems Explorer--the authoritative source for conservation information in British Columbia.

Additional Photo Sources

General References


Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2019. E-Fauna BC: Electronic Atlas of the Fauna of British Columbia [efauna.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 18/11/2019 4:58:16 PM]
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