JOURNAL OF PLANKTON RESEARCH | VOLUME 14 | NUMBER 6 | PAGES 821-834 | 1992
© Oxford University Press
research-article |
Flow through the feeding structures of suspension feeding zooplankton: a physical model approach
1Marine Biological Laboratory, University of Copenhagen Strandpromenaden 5, DK-3000 Helsingør, Denmark, Sweden 2Kristineberg Marine Biological Station PL. 2130 S-450 34, Fiskebäckskil, Sweden 3Present address: Roskilde University, Institute I, Life Sciences and Chemistry PO Box 260, DK-4000 Roskilde, Denmark 4Present address: Skidaway Institute of Oceanography PO Box 13687, Savannah, GA 31416, USA
Received on March 15, 1991; accepted on January 7, 1992 Simple multi-filament models of suspension feeding zooplankton feeding structures were constructed and the flow through and around the models was described. The fraction of water passing the filter depends on filament diameter, interfilament spacing and the number of filaments. Within a realistic range of Reynolds' numbers (Re) only a fraction of the head on water stream passed through the filters. The significance of morphological characteristics was also investigated for a biological more relevant 90° sweep. Spreading the filaments apart caused a significant increase in leakage compared with parallel filaments and, by introducing side branches the models acted as slightly leaky sieves. The leakage can change from 20–30% to almost 100% when Re increased from 0.1 to 1. Leakage depends on the orientation of the side branches indicating the importance of asymmetric drag during water processing at low Re. The observations are discussed in the context of the morphology and movements of feeding structures of ciliary feeding benthic larvae and of setal feeding copepods. The usefulness of physical models as a supplement to direct observations on zooplankton and mathematical models is emphasized.
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