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• W2079497958 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 245:133-148 (2002) - doi:10.3354/meps245133 Ultrastructure, morphology and flux of microzooplankton faecal pellets in an east Antarctic fjord Karin L. Beaumont1,2,*, Geraldine V. Nash2, Andrew T. Davidson2 1School of Zoology, University of Tasmania, Hobart, Tasmania, Australia 2Australian Antarctic Division, Channel Highway, Kingston, Tasmania, Australia *Present address: Kingston. Email: karin.beaumont@aad.gov.au ABSTRACT: Small copepods and protozoa are major contributors to heterotrophic biomass in Antarctic waters. They produce small (<300 µm) faecal pellets, the fates of which are largely unknown. We examined the distribution and abundance of microzooplankton and small faecal pellets in Ellis Fjord, east Antarctica. We determined statistical relationships between the abundance of microzooplankton and pellets, and examined pellet morphology and ultrastructure using light and scanning electron microscopy. Our results indicate species-specific differences in the morphology and fate of pellets produced by small copepods: Oithona similis and harpacticoid pellets were retained in upper waters, while Oncaea curvata and Paralabidocera antarctica pellets sank to depth. Protozoan pellets did not sink to depth irrespective of their source or morphology and despite the fact they can be larger than those produced by small copepods. The majority of microzooplankton pellets, composed of phytoplankton that otherwise may have directly sedimented to depth, was retained in near surface waters and probably recycled and remineralised. Despite producing faecal aggregates, heterotrophic activity of most microzooplankton do not contribute to vertical flux but instead support respiration of matter in upper waters. This may reduce the vertical flux of particulate matter to depth, thereby reducing the capacity of Antarctic waters to act as a carbon sink, with implications for global climate. KEY WORDS: Faecal pellets · Flux · Copepods · Protozoa Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 245. Online publication date: December 18, 2002 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2002 Inter-Research." @default.
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• W2079497958 date "2002-01-01" @default.
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• W2079497958 title "Ultrastructure, morphology and flux of microzooplankton faecal pellets in an east Antarctic fjord" @default.
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• W2079497958 doi "https://doi.org/10.3354/meps245133" @default.
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