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• W2065049840 abstract "AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials AME 26:247-257 (2002) - doi:10.3354/ame026247 Dinoflagellate grazing on the raphidophyte Fibrocapsa japonica Urban Tillmann1,*, Marcus Reckermann2 1Alfred Wegener Institute, Am Handelshafen 12, 27570 Bremerhaven, Germany 2Research and Technology Centre, Hafentoern, 25761 Büsum, Germany *E-mail: utillmann@awi-bremerhaven.de ABSTRACT: Laboratory experiments were performed to determine the growth and grazing capabilities of 2 heterotrophic dinoflagellates with different feeding modes (pallium feeder: Oblea rotunda; engulfment feeder: Oxyrrhis marina) when fed the raphidophyte Fibrocapsa japonica. Both dinoflagellates readily ingested prey and exhibited positive growth when feeding on monocultures of F. japonica. Maximum growth rates at food saturation were 0.54 and 0.72 d-1 for O. rotunda and O. marina, respectively. Both dinoflagellates are thus able to grow faster than their prey, for which a maximum growth rate of 0.45 d-1 has been previously reported. In the case of O. rotunda, it was found that a rather high food concentration of 300 F. japonica cells ml-1 (corresponding to 142 μg C l-1) was needed to sustain half-saturated growth. This is consistent with the quantification of behavioural aspects of the feeding process. In about 55% of cases, a failure to attach the tow filament after prey encounter was recorded, and in about 83% of cases, F. japonica was able to escape from the attached tow filament, indicating that motility of F. japonica is a quite effective defence mechanism against pallium-feeding dinoflagellates. In addition, qualitative observations suggest that trichocysts of F. japonica may act mechanically as a grazer deterrent. KEY WORDS: Fibrocapsa japonica · Heterotrophic dinoflagellates · Oblea rotunda · Oxyrrhis marina · Protozoan grazing · Trichocysts Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 26, No. 3. Online publication date: January 18, 2002 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2002 Inter-Research." @default.
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• W2065049840 title "Dinoflagellate grazing on the raphidophyte Fibrocapsa japonica" @default.
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