Lesser bladderwort
Utricularia minor
The lesser bladderwort is a perennial, rootless aquatic plant found in nutrient-poor peat bogs, hollows, and ditches. The plant features finely divided leaves equipped with tiny bladders that capture prey using a vacuum-driven suction mechanism. During the flowering period from June to August, its pale yellow inflorescences emerge above the water surface. For overwintering, the species forms spherical winter buds (turions) that sink to the bottom of the water body.
Details
Oxygen production
Low, as the plant often grows in oxygen-poor, stagnant waters.
Habitat function
Provides structure in shallow bog hollows and serves as a hunting ground for aquatic microorganisms.
Nutrient uptake
Nutrient uptake occurs partly through the water, but significantly through the digestion of captured prey (source of nitrogen).
Food source for
Occasionally for waterfowl and invertebrate herbivores.
Human use
No direct economic use; of interest to botanists and carnivorous plant enthusiasts.
Ecology
Ecological role
Top predators in the microcosm of oligotrophic waters; regulates populations of micro-invertebrates.
Natural predators
Waterfowl (occasional grazing), aquatic snails.
Competitor species
Other bladderwort species (e.g., Utricularia intermedia), sphagnum mosses during progressive siltation.
Ecosystem service
Contributes to biodiversity in peatlands; serves as a model organism for research on biomechanical traps.
Threats
Drainage of peatlands, eutrophication from agriculture, abandonment of traditional pond management.
Scientific profile
Profile
Reproduction
Reproduction occurs generatively via seeds and vegetatively through the formation of turions (winter buds) as well as through the fragmentation of the shoots.
Protection & threats
Main threats
Eutrophication through nitrogen deposition, drainage of bogs and wetlands, peat extraction, and natural succession or terrestrialization of small water bodies.