Common Brimstone
Gonepteryx rhamni
The Common Brimstone is a distinctive butterfly, primarily recognized by the vibrant yellow coloration of the males. It belongs to the Pieridae family and is one of the first butterflies to become active in early spring. Its wings exhibit characteristic leaf mimicry, providing perfect camouflage when at rest. With a lifespan of up to twelve months, it is considered the longest-lived butterfly in Europe.
Details
Identification
Wing tips hooked and pointed, orange spots in the center of the wings, males lemon yellow, females pale greenish-white.
Social behavior
Solitary; interactions are largely limited to finding a mate during the breeding season.
Diet
Adults feed on nectar from thistles, lilac, and other flowering plants. Larvae are oligophagous on buckthorn species.
Spawning substrate
Leaves and buds of alder buckthorn (Frangula alnus) or buckthorn (Rhamnus cathartica).
Overwintering
Overwintering as an adult butterfly (imago) outdoors, protected by endogenous glycerol acting as an antifreeze.
Ecology
Ecological role
Important pollinator for a variety of wild plants and prey for insectivorous birds.
Natural predators
Insectivorous birds (e.g., tits), spiders, and predatory insects.
Competitor species
Other butterflies with a similar nectar spectrum, though direct competition is low.
Ecosystem service
Pollination of flowering plants in forests, gardens, and open landscapes.
Threats
Loss of woodland edge habitats, intensification of agriculture, and decline of the host plant alder buckthorn.
Scientific profile
Profile
Distinguishing features
Unique leaf-like wing shape with pointed tips (apex) and prominent veins serving as camouflage (mimesis). The Brimstone is the only native butterfly that overwinters as an adult completely unprotected in the open (e.g., on blackberry vines or ivy), surviving temperatures as low as -20 °C.
Habitat
Forest edges, clearings, shrublands, sunny forest paths, as well as gardens, parks, and wetlands where host plants occur.
Protection & threats
Main threats
Loss of edge structures and forest margins; removal of buckthorn and alder buckthorn during forestry operations; use of insecticides in agriculture.
Population trend
Currently widespread and stable, but local declines in intensively used agricultural landscapes lacking hedgerow structures.
Conservation measures
Promotion and preservation of Alder Buckthorn (Frangula alnus) in forests and gardens; protection of structurally rich forest edges; avoidance of pesticides near larval habitats.