Conjugating green algae
Zygnematophyceae
Zygnematophyceae, commonly known as conjugating green algae, are a class of freshwater algae that exist as either single cells or unbranched filaments. Their most defining characteristic is sexual reproduction via conjugation, where two cells form a connection (bridge) to exchange genetic material. They lack flagellated stages at all points in their life cycle. Many species, such as desmids, are significant bioindicators for water quality in bogs and stagnant water bodies.
Details
Oxygen production
Significant source of oxygen in stagnant and slow-moving water bodies.
Habitat function
Dense algal mats serve as hiding places and habitats for microorganisms.
Nutrient uptake
Uptake of nitrate and phosphate directly from the water column.
Food source for
Daphnia, small crustaceans, and various benthic grazers.
Human use
Model organisms in biological research (esp. cell biology and phylogenetics).
Ecology
Ecological role
Important primary producers in freshwater ecosystems; often form the base of the food chain.
Natural predators
Zooplankton, aquatic snails, various insect larvae, and tadpoles.
Competitor species
Other green algae, cyanobacteria, and duckweeds under high nutrient loads.
Ecosystem service
Oxygen production and sequestration of atmospheric carbon dioxide.
Threats
Eutrophication (over-fertilization) of water bodies and destruction of bog habitats.
Scientific profile
Protection & threats
Main threats
Eutrophication (nutrient input from agriculture), drainage of bogs and wetlands, herbicide runoff, as well as acidification or excessive liming of water bodies.