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• W2022136424 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 250:145-152 (2003) - doi:10.3354/meps250145 Selection and processing of large suspended algae in the oyster Crassostrea gigas Bruno Cognie1,*, Laurent Barillé1, Guillaume Massé2, Peter G. Beninger1 1Isomer, Faculté des Sciences, Université de Nantes, 44322 Nantes, Cedex 03, France 2Department of Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, United Kingdom *Email: bruno.cognie@isomer.univ-nantes.fr ABSTRACT: The mechanisms and sites of processing and selection of large natural algal particles were studied in the oyster Crassostrea gigas, which possesses a heterorhabdic pseudolamellibranch gill type. Endoscopic observations of processing 1000 cells ml-1 suspensions of the pennate diatoms Pleurosigma planctonicum and Rhizosolenia setigera were performed, as well as endoscope-directed sampling of 100 cells ml-1 mixed suspensions of intact (25%) and empty (75%) 150 x 200 µm Coscinodiscus perforatus. Video endoscopy was used to observe processing on the gill and to allow in vivo sampling of contents of the dorsal and ventral particle tracts, while pseudofaeces was collected from the individual flow-through chambers. Selection indices were calculated for empty C. perforatus at each processing site. Only those P. planctonicum orientated in a dorso-ventral position could enter the principal filaments (PF) for delivery to the dorsal acceptance tract. R. setigera almost never entered the PF, being prevented by its curved and twisted shape. Visual counts of intact versus empty C. perforatus were done on samples from the ambient medium, ventral and dorsal particle tracts, and pseudofaeces. They showed that the percentages of intact and empty cells in both the dorsal and ventral particle tracts were identical to those initially presented (Kruskal-Wallis test; p > 0.05). In contrast, the pseudofaeces contained over 98% empty cells (Kruskal-Wallis test; p ≤ 0.001, degree of selection ranged from +29 to +34%). These results show that (1) large natural particles within the size range naturally encountered by C. gigas may only b subjected to qualitative selection on the gills if their shape and dimension allow them to enter the PF, and (2) the site of selection for particles unable to enter the PF is not the gill, but rather the labial palps. Selection sites and mechanisms in heterorhabdic bivalves should therefore be studied over the entire range of naturally available particle sizes. Given the periodic dominance of large diatoms in coastal temperate waters, the labial palp processing site could be of considerable importance in the dynamics of seston flow in oyster-dominated ecosystems. KEY WORDS: Crassostrea gigas · Selection sites · Large diatoms · Endoscopy Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 250. Online publication date: March 26, 2003 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2003 Inter-Research." @default.
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• W2022136424 title "Selection and processing of large suspended algae in the oyster Crassostrea gigas" @default.
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