Ciliates in a waste stabilization pond system in Mexico

Abstract

A protozoological survey was performed on a waste-stabilization pond to isolate, identify, and determine the incidence of ciliates present in these waters. The correlation between the species found and the physicochemical parameters was investigated. One hundred and eighty samples were analyzed from February 1983 to February 1984. Free-living ciliates isolated include: Carchesium polypinum Linnaeus, Vorticella microstoma Ehrenberg, Vorticella convallaria Linnaeus, Didinium balbiani Fabr6-Domergue, Amphileptus claparedei Stein, Spathidium spathula Mtiller, Litonotus fasciola Ehrenberg, Paramecium caudatum MOiler, Paramecium aurelia Ehrenberg, Tetrahymena vorax Kidder, Tetrahymena pyriformis Ebrenberg, Cyclidium glaucoma Mtiller, Aspidisca costata Ehrenberg, and Stylonychia putrina Stokes. The performance of the pond was predominantly anaerobic. The temperature, total alkalinity, and nitrate concentration were the most variable parameters in the system studied.

Life History Characteristics of Cladocerans Cladocera) Fed on Wastewaters

“…About 10 000 tons of sewage is produced daily; however, the current sewage treatment plants are inadequate and in those that do function, the treatment is often not complete whereby large quantities of organic matter, Protozoa, and bacteria persist [4]. The water is often used for industrial or commercial purposes (such as car washing) and to fill freshwater bodies such as Lake Xochimilco (Mexico City) or Lake Zumpango (State of Mexico).…”

“…Ciliates, rotifers, cladocerans, and copepods generally dominate the zooplankton community in freshwater ecosystems including sewage stabilization ponds [3,4]. Among these groups, in terms of biomass, cladocerans form the largest group due to their large size and parthenogenetic reproduction.…”

Avaliação da atividade microbiana metanogênica na lagoa de estabilização anaeróbia da estação de tratamento de esgotos sanitários do município de Cajati, Vale do Ribeira do Iguape, Estado de São Paulo

“…Alguns trabalhos identificaram a presença e o comportamento de certos grupos em lagoas facultativas, notadamente para zooplancton e fitoplancton em la goas facultativas (PATIL et al, 1975;RIVERA et al, 1987 Entretanto, estudos que enfoquem a diversidade e a interação entre os microrganismos responsáveis pelos processos envolvidos na degradação da matéria orgânica são bastante escassos, particularmente para os organismos anaeróbios que se desenvolvem nas lagoas anaeróbias e na zona anaeróbia das lagoas facultativas.…”