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First report on the colony-forming freshwater ciliate Ophrydium versatile in an African river

dc.contributor.authorOberholster P.J.
dc.contributor.authorAshton P.J.
dc.contributor.authorFritz G.B.
dc.contributor.authorBotha A.-M.
dc.date.accessioned2011-05-15T15:58:09Z
dc.date.available2011-05-15T15:58:09Z
dc.date.issued2010
dc.identifier.citationWater SA
dc.identifier.citation36
dc.identifier.citation3
dc.identifier.issn3784738
dc.identifier.urihttp://hdl.handle.net/10019.1/10799
dc.description.abstractOphrydium versatile (Muller 1786) Ehrenberg 1830 - a symbiotic ciliate that forms gelatinous colonies - is widely distributed in temperate lakes in Europe and America, but has not previously been recorded from rivers. In this paper we report the first record of O. versatile in an African river, based on an identity confirmed by molecular taxonomic identification. The limnological conditions within the Lephalala River during the sampling period were characterised as oligotrophic with low DOC concentrations, similar to the conditions observed in temperate northern hemisphere lakes where these organisms have been recorded previously. The majority of O. versatile colonies occurred in areas where thin orange-coloured films containing high concentrations of iron (> 60% Fe) covered the substrate and bedrock of the river; this may be related to the abundant picophytoplankton that were associated with these films and oligotrophic conditions. The planktonic diatom Gomphonema venusta Passy was dominant in the water column throughout the study period and acted as an environmental indicator of low electrical conductivity (EC) conditions in the habitat where O. versatile colonies were recorded.
dc.subjectElectrical conductivity
dc.subjectEnvironmental indicators
dc.subjectHigh concentration
dc.subjectLapalala river
dc.subjectLimnological conditions
dc.subjectNorthern Hemispheres
dc.subjectOligotrophic conditions
dc.subjectOligotrophic indicator
dc.subjectPlanktonic diatoms
dc.subjectSampling period
dc.subjectTaxonomic identifications
dc.subjectWater columns
dc.subjectElectric conductivity
dc.subjectLakes
dc.subjectWater pollution
dc.subjectWater quality
dc.subjectRivers
dc.subjectbedrock
dc.subjectciliate
dc.subjectcolony founding
dc.subjectdiatom
dc.subjectelectrical conductivity
dc.subjectlimnology
dc.subjectnew record
dc.subjectNorthern Hemisphere
dc.subjectpicoplankton
dc.subjectsymbiont
dc.subjecttaxonomy
dc.subjectwater column
dc.subjectwater quality
dc.subjectAfrica
dc.subjectEurope
dc.subjectLephalala River
dc.subjectLimpopo
dc.subjectSouth Africa
dc.subjectUnited States
dc.subjectBacillariophyta
dc.subjectCiliophora
dc.subjectGomphonema
dc.subjectOphrydium versatile
dc.titleFirst report on the colony-forming freshwater ciliate Ophrydium versatile in an African river
dc.typeArticle
dc.description.versionArticle


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