The effect of three different predatory ciliate species on activated sludge microfauna
| Autor: | Agnieszka Pajdak-Stós, Janusz Fyda, Mateusz Sobczyk, Edyta Fiałkowska, Wioleta Kocerba-Soroka |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Ciliate ciliate ecology Sewage food web Ecology 010604 marine biology & hydrobiology 010501 environmental sciences Biology biology.organism_classification 01 natural sciences Microbiology Predation Dileptus margaritifer Activated sludge Epistylis Microfauna Animals Microbial Interactions Protozoa predation Ciliophora Predator biodiversity 0105 earth and related environmental sciences |
| Zdroj: | European Journal of Protistology. 58:87-93 |
| ISSN: | 0932-4739 |
| Popis: | Bacterivorous ciliates play important roles in the functioning of activated sludge by reducing dispersed bacteria and enhancing flocculation. There are, however, no data on the resistance of this functional group of microorganisms to predation. Our experiment was conducted with activated sludge subsamples subjected to artificially introduced three predatory ciliates species. The two predator species originating from activated sludge were Oxytricha sp. and Spathidium spathula. Dileptus margaritifer was a “foreign” predator species. The latter was introduced to compare its effect with the influence of predators naturally occurring in activated sludge on the ciliates community potentially adapted to certain predation strategies. Results showed that introduction of predatory ciliates into the activated sludge did not significantly change the total abundance of protozoa but rebuilt bacterivorous ciliate communities. Introduced predators significantly affected the most numerous ciliate species from the genera Epistylis and Cyclidium. In the presence of D. margaritifer, the abundance of sessile, colonial ciliates (Epistylis sp.) was significantly lower compared to the control treatment and to the treatments with the other predators. The activated sludge ciliate community was the most affected by the introduction of the “foreign” predator – D. margaritifer, a large ciliate armed with toxicysts. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect