Colonial bell ciliate
Carchesium polypinum
Colonial bell ciliates like Carchesium polypinum consist of numerous bell-shaped individual cells attached to branched stalks. They colonize submerged surfaces in stagnant and flowing waters as well as wastewater treatment plants. Using their ciliary wreath, they create a water current to filter bacteria from the surroundings. Unlike Vorticella, the stalks of individual cells in Carchesium contract independently of one another.
Details
Identification
Bell-shaped zooids, tree-like branched colony structure, contractile myonemes in the stalks that are not interconnected.
Social behavior
Forms sessile colonies with up to several hundred individuals through incomplete division.
Diet
Bacterivorous diet; filters bacteria and fine organic particles from the water.
Hunting strategy
Filter feeder; creates a water vortex using cilia on the peristome.
Overwintering
Formation of resting stages (cysts) under unfavorable conditions.
Ecology
Ecological role
Important primary consumer in the microbial loop; reduces bacterial populations in water bodies and activated sludge.
Natural predators
Predatory snails, rotifers, predatory ciliates, and small crustaceans.
Competitor species
Other peritrich ciliates such as Epistylis or Vorticella species.
Ecosystem service
Contributes significantly to the biological self-purification of water bodies and wastewater treatment.
Threats
Extreme chemical toxicity or complete desiccation of habitats.
Scientific profile
Profile
Habitat
Freshwater ecosystems (limnic), especially lotic and lentic waters with moderate to high organic loading. Frequently found as periphyton on aquatic plants, stones, or in wastewater treatment plants (activated sludge).
Reproduction
Asexual reproduction by longitudinal binary fission, where one daughter cell becomes a free-swimming telotroch (swarmer) to establish new colonies. Sexual reproduction via conjugation.
Ecological role
Important consumer in the microbial loop; regulates bacterial populations and contributes to water clarity by efficiently filtering out suspended particles and microorganisms.