Common benthic cyanobacteria
Phormidium spp.
Common benthic cyanobacteria consist of blue-green algae that form dense, often dark green to blackish-blue films or mats on stones and other submerged substrates. These organisms are essential components of periphyton in lotic and lentic waters and can develop extensive coatings under favorable conditions. They are known for their ability to fix nitrogen and, in some cases, produce toxins such as anatoxins.
Details
Oxygen production
Produces oxygen during the light phase through photosynthesis.
Habitat function
Provides microhabitats for protozoa and small invertebrates.
Nutrient uptake
Efficient uptake of dissolved phosphate and nitrogen compounds.
Food source for
Important food source for benthic invertebrates (grazers).
Human use
Used in research as a model organism for biofilms; partially problematic due to toxin formation in bathing waters.
Ecology
Ecological role
Primary producer and base of the benthic food chain; contributes to nitrogen fixation.
Natural predators
Grazers such as snails, mayfly larvae, and certain fish.
Competitor species
Diatoms, green algal periphyton.
Ecosystem service
Oxygen production and nutrient sequestration in the water body.
Threats
Herbicide input, extreme mechanical disturbance (strong flooding).
Scientific profile
Protection & threats
Main threats
Herbicide inputs from agriculture, extreme acidification of water bodies, and mechanical disturbances from massive flood events or construction activities.