Bristly Stonewort
Chara hispida
The Bristly Stonewort is a large, robust macroalga of the Characeae family, typically heavily encrusted with lime. It is characterized by thick stems and numerous cortical spines, often arranged in clusters, giving it a bristly appearance. This species frequently forms extensive, dense carpets on the bottom of clean, lime-rich lakes and ponds.
Details
Oxygen production
High, contributes significantly to oxygen saturation in the benthic zone.
Habitat function
Provides hiding places for fish fry and habitat for various invertebrates (macrozoobenthos).
Nutrient uptake
Very efficient uptake of dissolved nutrients from the water and incorporation into biomass and lime crusts.
Food source for
Important food source for specialized waterfowl such as the Red-crested Pochard (Netta rufina).
Human use
Formerly used in some cases for soil improvement (lime fertilization), today primarily of ecological importance.
Ecology
Ecological role
Pioneer species in newly created water bodies; contributes to biogenic decalcification and thus water clarity; oxygen producer.
Natural predators
Waterfowl (e.g., Red-crested Pochard), herbivorous fish, and aquatic insect larvae.
Competitor species
Other stonewort species or, in case of eutrophication, higher flowering plants such as Potamogeton species.
Ecosystem service
Nutrient retention through phosphate binding in lime; habitat formation for microorganisms.
Threats
Eutrophication due to fertilizer input, water turbidity, mechanical destruction by shipping or recreational swimming.
Scientific profile
Profile
Reproduction
Generative via oospores, which develop after fertilization of the oogonia and act as dormant stages; vegetative through shoot fragmentation and more rarely via bulbils on the rhizoids.
Protection & threats
Main threats
Eutrophication (especially phosphorus inputs), turbidity caused by algal blooms, mechanical destruction by boating or swimming activities, and herbicide inputs from agriculture.