Common Water-plantain
Alisma plantago-aquatica
Common Water-plantain is a perennial herbaceous aquatic plant native to Eurasia and North Africa. It is characterized by its basal, long-petioled leaves that resemble spoons and a large, highly branched pyramidal inflorescence. During summer, it produces numerous small, three-petaled white to pale pink flowers. The species is highly adaptable to fluctuating water levels and can grow in both submerged and emergent forms.
Details
Oxygen production
Low oxygen release into the water because photosynthesis primarily occurs in the emergent leaves.
Habitat function
Spawning ground for fish and amphibians, perch for dragonflies, hiding place for juvenile fish.
Nutrient uptake
Effective uptake of phosphates and nitrates from sediment and water.
Food source for
Seeds serve as food for birds; rhizomes are consumed by muskrats.
Human use
Occasionally used as an ornamental plant for garden ponds; historically used in folk medicine as a diuretic (though toxic when fresh).
Ecology
Ecological role
Provides structure in the riparian zone, serves as spawning substrate for amphibians and habitat for aquatic insects.
Natural predators
Waterfowl, muskrats, various insect larvae (e.g., leaf miners).
Competitor species
Cattails (Typha spp.), bur-reeds (Sparganium spp.) under high nutrient loads.
Ecosystem service
Nutrient sequestration, shore stabilization through rhizome networks, promotion of biodiversity.
Threats
Destruction of wetlands, intensive shore reinforcement, drainage activities.
Scientific profile
Profile
Reproduction
Generative via numerous buoyant achenes (seeds) dispersed by water or waterfowl; vegetative through rhizome fragmentation.
Protection & threats
Main threats
Drainage of wetlands, intensive ditch clearing, loss of shallow littoral zones due to structural engineering.