Treść książki
Przejdź do opcji czytnikaPrzejdź do nawigacjiPrzejdź do informacjiPrzejdź do stopki
Ascomorphasp.Trichocercasp.,Polyarthrasp.,andPompholyxsulcataaswell
asontheprotozoanCodonellaandlargealgaesuchasCeratium,Fragillaria,
Synedra,andPediastrum(Fig.17).
Fig.17.AsplanchnapriodontawithKeratellaquadratainsideitsstomach
(Photo:I.BIELAńSKA-GRAjNER)
SpeciesofthegeneraKeratellaandPolyarthrawereobservedtofeedvigor-
ouslyonflagellateandnon-flagellateChlamydomonas,butdidnotingestChlo-
rellaandRhodothorula,whichweremostprobablyunpalatableforthem(GILBERT
andBOGDAN1981).
ExperimentsdescribedbyGILBERTandSTARKWEATHER(1977,1978)demon-
stratedBrachionuscalyciflorustobecapableofcontrollingtheamountoffood
ingestedinthreeways.Inthefirst,therotifersusetheanteriorbandofcilia(pseu-
dotrochus)todirectthefoodtowardsthemouth.Thesecondwayinvolvesretain-
ingfoodparticlesonthesurfaceofthecoronaandsweepingthembythebuc-
calfieldcilia.Inthethirdway,foodparticlesthatgetclosetothemouthdueto
theactionofthebuccalciliamaybere-routedtothebuccalfieldanddiscarded.
SomespeciesofthegeneraBrachionusandPtygurausethemastaxtorejectfood
particles(usuallylargeones)fromthebuccalcavity.Somespeciesofthegenera
AsplanchnaandAsplanchnopususetheirtrophitoremovecarapacesorotherhard
partsofthebodyoftheirprey(e.g.,cladocerans)fromtheirstomachs(WALLACE
andSNELL1991).
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