Delicate Stonewort
Chara virgata
The Delicate Stonewort is a slender, perennial macroalga that forms dense carpets on the bottom of various water bodies. It is characterized by a diplostichous, tylacanthous cortex, where the spine cells are located on the prominent primary cortical cells. This species prefers oligo- to mesotrophic standing waters such as lakes, ditches, and peat pools. As a pioneer species, it is often among the first to colonize newly created waters and contributes significantly to sediment stabilization.
Details
Oxygen production
Very high; contributes significantly to the oxygen supply in the benthic zone.
Habitat function
Important spawning ground for fish and a refuge for zooplankton and insect larvae.
Nutrient uptake
Effective uptake of nutrients (especially phosphorus) directly from the water and the sediment.
Food source for
Important food source for specialized waterfowl such as the Red-crested Pochard.
Human use
Historically used as calcareous fertilizer; today important in aquatic ecology and lake restoration.
Ecology
Ecological role
Pioneer species, stabilizes sediment, reduces turbidity through nutrient sequestration, and provides habitat for epiphytes and invertebrates.
Natural predators
Waterfowl (especially ducks), herbivorous fish (e.g., Rudd), and various aquatic snails.
Competitor species
Other charophyte species and, in cases of eutrophication, higher aquatic plants such as pondweeds (Potamogeton spp.).
Ecosystem service
Improvement of water clarity, phosphate binding, oxygen enrichment of deep water layers.
Threats
Eutrophication due to fertilizer runoff, mechanical disturbances from recreational use, invasive species (e.g., crayfish), and herbicide use.
Scientific profile
Profile
Reproduction
Monoecious; sexual via oogonia and antheridia (oospores as resting stages), vegetative via rhizoid bulbils.
Protection & threats
Main threats
Eutrophication, water turbidity, herbicide inputs, mechanical destruction by boat traffic.