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Titolo:
Confusing selective feeding with differential digestion in bacterivorous nanoflagellates
Autore:
Boenigk, J; Matz, C; Jurgens, K; Arndt, H;
Indirizzi:
Univ Cologne, Inst Zool, Dept Gen Ecol & Limnol, D-50923 Cologne, Germany Univ Cologne Cologne Germany D-50923 & Limnol, D-50923 Cologne, Germany Max Planck Inst Limnol, Dept Physiol Ecol, D-24306 Pon, Germany Max PlanckInst Limnol Pon Germany D-24306 ol Ecol, D-24306 Pon, Germany
Titolo Testata:
JOURNAL OF EUKARYOTIC MICROBIOLOGY
fascicolo: 4, volume: 48, anno: 2001,
pagine: 425 - 432
SICI:
1066-5234(200107/08)48:4<425:CSFWDD>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
MARINE PHAGOTROPHIC PROTOZOA; NANOPLANKTON; PREY; OCHROMONAS; INGESTION; SYSTEMS; RATES; SIZE;
Keywords:
ecology; feeding process; grazing; microbial food web; optimal foraging; prey handling; protists;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Boenigk, J Austrian Acad Sci, Inst Limnol, Mondseestr 9, A-5310 Mondsee, Austria Austrian Acad Sci Mondseestr 9 Mondsee Austria A-5310 Austria
Citazione:
J. Boenigk et al., "Confusing selective feeding with differential digestion in bacterivorous nanoflagellates", J EUKAR MIC, 48(4), 2001, pp. 425-432

Abstract

Food selectivity and the mechanisms of food selection were analyzed by video microscopy for three species (Spumetla. Ochromonas, Cafeteria) of interception-feeding heterotrophic nanoflagellates. The fate of individual prey particles, either live bacteria and/or inert particles, was recorded during the different stages of the particle-flagellate-interaction, which includedcapture, ingestion, digestion, and egesrion. The experiments revealed species-specific differences and new insights into the underlying mechanisms ofparticle selection by bacterivorous flagellates. When beads and bacteria were offered simultaneously, both particles were ingested unselectively at similar rates. However. the chrysomonads Spumella and Ochromonas egested theinert beads after a vacuole passage time of only 2-3 min. which resulted in an increasing proportion of bacteria in the food vacuoles. Vacuole passage time for starved flagellates was significantly longer compared to that ofexponential-phase flagellates for Spumella and Ochromonas. The bicosoecid Cafeteria stored all ingested particles, beads as well as bacteria, in foodvacuoles for more then 30 min. Therefore "selective digestion" is one mainmechanism responsible for differential processing of prey particles. This selection mechanism may explain some discrepancies of former experiments using inert particles as bacterial surrogates for measuring bacterivory.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 14:35:38