Chlamydomonas
Chlamydomonas
The cup-shaped green alga is a genus of unicellular green algae characterized by two equal-length flagella and a prominent cup-shaped chloroplast. They are found globally in freshwater habitats, damp soils, and even extreme environments like snow. These algae possess a light-sensitive eyespot that allows for phototactic orientation to optimize photosynthesis. As a model organism, it is of paramount importance in cell biology and genetics.
Details
Oxygen production
High; contributes significantly to oxygen saturation in small stagnant water bodies.
Habitat function
Serves as a fundamental energy source in the aquatic food web.
Nutrient uptake
Efficient uptake of dissolved phosphates and nitrates from the water.
Food source for
Zooplankton, small invertebrates, and larval fish.
Human use
Model organism in biological research; potential for biofuel production and wastewater treatment.
Ecology
Ecological role
Important primary producer in aquatic ecosystems; forms the nutritional basis for zooplankton.
Natural predators
Filter-feeding zooplankton such as Daphnia, rotifers, and protozoa.
Competitor species
Other green algae (e.g., Scenedesmus), diatoms, and cyanobacteria.
Ecosystem service
Oxygen production through photosynthesis and carbon dioxide sequestration.
Threats
Input of herbicides and toxic chemicals into water bodies.
Scientific profile
Profile
Distinguishing features
Two equal-length (isokont) flagella at the apical pole; a cup-shaped chloroplast with at least one pyrenoid; a light-sensitive eyespot (stigma) for phototaxis; two contractile vacuoles at the base of the flagella.
Reproduction
Asexual by longitudinal fission within the mother cell wall (formation of 2-8 zoospores); sexual by isogamy, anisogamy, or oogamy (often induced by nitrogen depletion).
Protection & threats
Status not on standard scale
Main threats
Input of herbicides (e.g., atrazine derivatives) from agriculture that inhibit photosystem II; extreme acidification of water bodies.
Conservation measures
Protection and restoration of small water bodies; reduction of diffuse nutrient and pesticide inputs from agricultural land.