Azure Damselfly
Coenagrion puella
The Azure Damselfly is a common and widespread damselfly across Europe. Males are identified by their bright blue coloration and a distinct U-shaped or horseshoe-shaped black mark on the second abdominal segment. They primarily inhabit standing or slow-moving water bodies with abundant aquatic vegetation. The species is very common in Europe and is a typical inhabitant of garden ponds and small lakes.
Details
Identification
Black horseshoe-shaped mark on the 2nd abdominal segment of males; pterostigmata are short, diamond-shaped, and dark.
Social behavior
Mainly solitary, but forms dense aggregations at the water's edge during the breeding season.
Diet
Predatory; adults catch small flying insects in the air or from plants, while larvae hunt small aquatic organisms.
Hunting strategy
Adults are perch-and-wait predators; larvae are ambush predators in the water.
Spawning substrate
Eggs are inserted into the living tissue of aquatic plants (endophytic oviposition).
Overwintering
Overwintering occurs in the larval stage underwater, usually at the bottom or among aquatic plants.
Ecology
Ecological role
Important consumer in both aquatic and terrestrial food webs; serves as prey for birds, amphibians, and larger insects.
Natural predators
Birds, larger dragonflies (Anisoptera), spiders, frogs, and fish (for larvae).
Competitor species
Other damselflies such as the Variable Damselfly (Coenagrion pulchellum).
Ecosystem service
Biological control of mosquitoes and other small insects.
Threats
Loss of small water bodies, heavy eutrophication, and pesticide runoff from agriculture.
Scientific profile
Profile
Distinguishing features
Males: Horseshoe mark on S2 (open towards the rear), segments S3 to S5 predominantly blue with narrow black apical rings, S8 and S9 almost entirely blue. Females: Posterior margin of the pronotum is deeply trilobed, with the middle lobe protruding significantly.
Role in food web
Important mesopredator; serves as a link between aquatic primary production/invertebrates and higher trophic levels (birds, fish).
Protection & threats
Main threats
Destruction of small water bodies, intensive fish farming (high predation pressure), excessive use of pesticides in agriculture, loss of riparian buffer zones.
Population trend
Stable; the species is widespread and common in Central Europe.
Conservation measures
Maintenance and creation of vegetation-rich standing waters, promotion of buffer zones to reduce nutrient and pesticide inputs, avoidance of fish stocking in small ponds.