Slender Tufted-sedge
Carex acuta
Carex acuta, commonly known as the slender tufted-sedge, is a perennial plant typical of wet meadows, ditches, and riparian zones. It often forms extensive stands known as large-sedge mires and is characterized by its sharp, triangular stems. The species spreads through wind-pollinated seeds as well as very effectively via robust underground rhizomes.
Details
Oxygen production
Minor oxygen release via aerenchyma into the rhizosphere to overcome anoxia.
Habitat function
Important nesting site for marsh harriers and reed warblers; provides cover for amphibians and juvenile fish during floods.
Nutrient uptake
High capacity for nitrogen and phosphorus uptake, therefore often used in constructed wetlands for wastewater treatment.
Food source for
Seeds serve as food for waterfowl; stems are used by caterpillars of various noctuid moths.
Human use
Formerly used as stable litter or for thatching; today used for restoration and in phytoremediation systems.
Ecology
Ecological role
Important primary producer in silting zones; provides structure for specialized fauna and contributes to peat formation.
Natural predators
Muskrats, various specialized insect larvae, and herbivorous waterfowl.
Competitor species
Other large sedges like Carex acutiformis or common reed (Phragmites australis) when water levels decline.
Ecosystem service
Shoreline stabilization, nutrient retention in floodplains, erosion control, and carbon storage in peaty soils.
Threats
Drainage of wetlands, intensive agricultural use of marginal lands, and river engineering.
Scientific profile
Profile
Reproduction
Generative via single-seeded nutlets (utricles) dispersed by water (hydrochory). Vegetative reproduction is vigorous via long-creeping, robust rhizomes that form dense stands (sedge mires).
Protection & threats
Main threats
Melioration and drainage of wetlands, intensive agricultural use of riparian buffer zones, river channelization, and loss of natural flooding dynamics.