Amara alpina is a species of ground beetle belonging to the genus Amara in the family Carabidae. It is a well-known Arctic-alpine species, adapted to cold, high-altitude, and high-latitude environments across the Northern Hemisphere.
Taxonomy
- Kingdom: Animalia
- Phylum: Arthropoda
- Class: Insecta
- Order: Coleoptera (Beetles)
- Family: Carabidae (Ground beetles)
- Genus: Amara Bonelli, 1810
- Species: A. alpina (Paykull, 1790)
The genus Amara is one of the largest genera within the Carabidae, encompassing numerous species primarily found in temperate and cold regions. Amara alpina was first described by Gustaf von Paykull in 1790.
Description
Amara alpina typically exhibits the robust and somewhat flattened body plan characteristic of many ground beetles. Adults are generally between 7 to 10 millimeters in length. Their coloration is usually dark, ranging from black to dark brown, often with a subtle metallic or bronze sheen on the elytra (wing covers). The antennae and legs may be slightly lighter in color. The elytra are usually striated (grooved) longitudinally. Like other members of the Amara genus, they possess well-developed mandibles for feeding and are generally strong runners.Habitat and Distribution
Amara alpina is a classic Arctic-alpine species, meaning it inhabits both high-latitude (Arctic) and high-altitude (alpine) regions.- Habitat: It is found in open, treeless environments such as tundra, alpine meadows, rocky slopes, scree fields, and heathlands, typically above the tree line in mountainous areas. It prefers dry to moderately moist substrates, often with sparse vegetation.
- Distribution: Its distribution is circumpolar, extending across the Palearctic and Nearctic realms.
- Palearctic: Found in northern Europe (e.g., Scandinavia, Ural Mountains), Siberia, and mountainous regions of central Asia.
- Nearctic: Occurs in Alaska, Canada (e.g., Yukon, Northwest Territories, British Columbia), and the Rocky Mountains of the United States.
This wide distribution highlights its significant adaptation to cold climates.
Ecology
Amara alpina, like many other Amara species, is primarily granivorous, feeding on the seeds of various plants. However, it can also be omnivorous, supplementing its diet with small invertebrates, especially during periods of high protein demand, such as before reproduction.- Life Cycle: Due to the harsh and short growing seasons in its native habitats, the life cycle of A. alpina is often prolonged. It may take more than one year to complete a generation (semivoltine), with individuals overwintering either as larvae or adults. Adults are typically active during the relatively warmer months of summer.
- Behavior: These beetles are generally nocturnal, foraging for food under the cover of darkness. They are adept at navigating rough terrain and are important components of the detritivore and herbivore food webs in their extreme environments. Their presence is often considered an indicator of healthy alpine and arctic ecosystems.