Ruddy Darter
Sympetrum sanguineum
The Ruddy Darter is a widespread dragonfly species where mature males display a striking blood-red coloration of the abdomen. A key identification feature is its entirely black legs, which distinguish it from similar darter species. It prefers stagnant water bodies with abundant vegetation, such as ponds and ditches. The species is very common across Europe and is frequently seen basking on exposed perches in the sun.
Details
Identification
Entirely black legs, blood-red abdomen (males), club-shaped thickening at the end of the abdomen, black forehead markings.
Social behavior
Males occupy temporary territories along the water's edge; otherwise largely solitary lifestyle.
Diet
Predatory; adults feed on small flying insects, while larvae feed on aquatic insects, tadpoles, and small crustaceans.
Hunting strategy
Perch-and-wait predator; waits for passing prey and catches it in a swift hunting flight.
Spawning substrate
Damp mud, moss, or shallow water zones with dense vegetation.
Overwintering
Overwintering occurs in the egg stage; larvae hatch in the following spring.
Ecology
Ecological role
Important predator in aquatic and terrestrial ecosystems for regulating insect populations.
Natural predators
Birds, amphibians, spiders, and larger predatory dragonfly species.
Competitor species
Other darters such as the Common Darter (Sympetrum striolatum).
Ecosystem service
Biological pest control by consuming mosquitoes and other insects.
Threats
Destruction of small water bodies, eutrophication, and intensive agricultural land use in the surroundings.
Scientific profile
Profile
Distinguishing features
The most important feature is the completely black legs (distinguishing it from S. vulgatum and S. striolatum). The male abdomen is distinctly club-shaped. The frons has a black line that ends at the eyes.
Role in food web
Secondary consumer; as a predator, it regulates insect populations and serves as prey for larger predators.
Protection & threats
Main threats
Loss of small water bodies through drainage, intensive agricultural land use in the surroundings (pesticide input), and excessive mechanical water body maintenance.
Population trend
Stable; the species is widespread and common in Central Europe and partially benefits from climate warming.
Conservation measures
Preservation and creation of small water bodies, promotion of buffer strips to agriculture, and protection of reed stands.