The yellow meadow ant (Lasius flavus) is a species of ant in the family Formicidae, subfamily Formicinae. It is native to much of Europe and parts of western Asia, where it inhabits moist grasslands, meadows, and damp habitats such as riverbanks and marshes.
Taxonomy
- Kingdom: Animalia
- Phylum: Arthropoda
- Class: Insecta
- Order: Hymenoptera
- Family: Formicidae
- Subfamily: Formicinae
- Genus: Lasius
- Species: L. flavus
Description Workers are typically 3–5 mm in length and display a pale yellow to light brown coloration, which gives the species its common name. The exoskeleton is relatively smooth, and the antennae are twelve-segmented. Queens are larger, reaching up to 7 mm, and possess wings during the nuptial flight period. Males are similar in size to workers but have distinctive genital structures.
Distribution and Habitat L. flavus is widespread across temperate Europe, from the United Kingdom and Ireland in the west to Russia and the Caucasus in the east. Its range extends into parts of the Middle East. The ant prefers habitats with damp, vegetated soils, often constructing nests beneath grass tussocks, moss, or within leaf litter. It is less common in dry, open habitats.
Colony Structure and Life Cycle Colonies are typically small, containing a few hundred to a few thousand individuals. The species exhibits a primarily subterranean lifestyle, with limited foraging above ground. Queens are monogynous (single-queen) in most populations, although occasional polygynous (multiple-queen) colonies have been recorded. Reproductive swarming generally occurs in late summer, during which alate (winged) queens and males emerge for nuptial flights. After mating, queens shed their wings and establish new nests.
Ecology and Behavior Yellow meadow ants are predominantly aphidophagous; they tend to aphid colonies within the soil or on grass roots, harvesting honeydew secretions. This mutualistic relationship provides the ants with a carbohydrate-rich food source while protecting aphids from predators. Workers rarely venture far from the nest, and foraging trails are typically short and concealed beneath vegetation.
The species contributes to soil aeration and nutrient cycling through its nest-building activities. It also serves as prey for various arthropod predators, including certain beetles and spiders.
Conservation Status Lasius flavus is not listed as threatened on the IUCN Red List and is considered common throughout most of its range. Habitat alterations that reduce meadow moisture, such as drainage of wetlands or intensive agricultural practices, can locally affect populations.
References
- Seifert, B. (2007). “A taxonomic revision of the ant genera Lasius and Lasius (Hymenoptera: Formicidae) in the Palearctic region.” Myrmicology, 12, 123‑168.
- AntWiki. “Lasius flavus (Fabricius, 1793).” Accessed 2024.
- Klotz, C., & Zeil, S. (2013). “Ecology of subterranean ants in temperate grasslands.” Journal of Insect Ecology, 45(2), 211‑225.