Common Scenedesmus
Scenedesmus
Scenedesmus is a microscopic green alga that typically forms flat colonies consisting of four or eight cells. The cells are arranged in a single row or slightly staggered, with the terminal cells often bearing characteristic spine-like projections. It is one of the most common members of freshwater phytoplankton in stagnant and slow-moving waters, serving as a vital food source for zooplankton.
Details
Oxygen production
High; contributes significantly to oxygen saturation in the epilimnion.
Habitat function
Food source for filter-feeding organisms.
Nutrient uptake
Very efficient uptake of nitrate and phosphate.
Food source for
Daphnia, rotifers, small crustaceans.
Human use
Used in wastewater treatment (phycoremediation) and as a model organism in research.
Ecology
Ecological role
Primary producer; forms the base of the aquatic food web and produces oxygen.
Natural predators
Zooplankton (especially water fleas like Daphnia), rotifers.
Competitor species
Other green algae, cyanobacteria (blue-green algae).
Ecosystem service
Oxygen production and CO2 fixation in aquatic environments.
Threats
Herbicide runoff from agriculture, extreme water acidification.
Scientific profile
Profile
Distinguishing features
Characteristic arrangement of cells in a single plane; marginal cells in many species (section Desmodesmus) bear long spines; cell wall often features ribs or granulations.
Reproduction
Asexual reproduction via the formation of autocolonies within the mother cell; sexual reproduction (isogamy) is extremely rare.