Fragile stonewort
Chara globularis
The fragile stonewort is a perennial, submerged green alga belonging to the Characeae family. It is characterized by its slender branches and whorls, which are frequently encrusted with calcium carbonate and typically show a dark green color. This species is ecologically versatile, inhabiting a wide range of aquatic environments from oligotrophic to mesotrophic standing and flowing waters.
Details
Oxygen production
Very high during the growing season due to intensive photosynthesis.
Habitat function
Provides habitat, shelter, and spawning grounds for numerous aquatic organisms such as insect larvae and juvenile fish.
Nutrient uptake
High efficiency in phosphorus uptake, contributing to clear-water states in lakes.
Food source for
Food source for waterfowl (especially the oospores) and various aquatic insects.
Human use
Formerly used as lime fertilizer in agriculture; today used as a bioindicator in water quality monitoring.
Ecology
Ecological role
Important primary producer; contributes to biogenic decalcification; forms dense mats that stabilize the water body floor.
Natural predators
Waterfowl, various aquatic invertebrates, and some fish species.
Competitor species
Other macrophytes such as pondweeds (Potamogeton spp.) or invasive species like Elodea.
Ecosystem service
Improvement of water quality through nutrient binding and promotion of sedimentation; oxygen enrichment of the water.
Threats
Eutrophication (excess nutrients), mechanical destruction by shipping or swimming activities, herbicide input.
Scientific profile
Profile
Reproduction
Both generative through the formation of oospores and vegetative through shoot fragmentation and the development of starch bulbils (rhizoid bulbils) for survival.