Euglena
Euglena viridis
Euglena viridis is a single-celled flagellate primarily found in nutrient-rich freshwater habitats. It is characterized by its mixotrophic nature, combining plant-like photosynthesis with animal-like heterotrophic feeding. Key features include green chloroplasts for energy production, a long flagellum for locomotion, and a red eyespot used for phototaxis.
Details
Oxygen production
Releases oxygen as a byproduct of photosynthesis during the light phase.
Habitat function
Inhabits the euphotic zone of stagnant and slow-moving water bodies.
Nutrient uptake
Efficient uptake of nitrogen compounds and phosphates from the water.
Food source for
Serves as a food source for various zooplankton and microfauna.
Human use
Frequently used as a model organism in biological research and science education.
Ecology
Ecological role
Important primary producer in freshwater ecosystems and a key link in the food chain for zooplankton.
Natural predators
Rotifers, small crustaceans (such as Daphnia), and planktivorous fish larvae.
Competitor species
Other phytoplankton species such as green algae or cyanobacteria.
Ecosystem service
Oxygen production through photosynthesis and carbon fixation.
Threats
Extreme chemical pollution or toxic herbicides in the water.
Scientific profile
Profile
Distinguishing features
Possesses a prominent red eyespot (stigma) at the anterior end; numerous disc-shaped or star-shaped (stellate) chloroplasts; storage of paramylon as a reserve material; presence of one emergent flagellum.
Reproduction
Asexual reproduction via longitudinal binary fission.
Protection & threats
Status not on standard scale
Main threats
No known threats; the species is widespread and benefits from anthropogenic eutrophication.
Conservation measures
No conservation measures required; monitoring primarily serves to assess water quality.