Hydrodynamic characteristics of aquiferous modules in the demosponge Halichondria panicea

Rachael A. Kealy, Thomas Busk, Josephine Goldstein, Poul S. Larsen, Hans Ulrik Riisgård*

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    Abstract

    Multi-oscula sponges are organisms composed of aquiferous modules, each of which draws water through its canal system by means of pumping units (choanocytes, Cs, in choanocyte chambers, CCs) such that the filtered water leaves the module as an exhalant jet through the osculum of the module. Here we compare relations between the characteristic parameters of sponge volume (V), osculum cross-sectional area (OSA), exhalant jet speed (U0), and filtration rate (F) of single-osculum explants and individual aquiferous modules of multi-oscula explants of the demosponge Halichondria panicea. The latter modules are identified by observing from which from which osculum the surface administered dye will emerge. There is fair agreement in results between the two types of modules. For both types, the filtration rate is a linear function of the modules? volume, with average values of volume-specific filtration rate (FV) of 1.8 and 1.2 ml min-1cm-3 for single- and multi-oscula sponge explants, respectively. This and data from the literature for 5 demosponges support the hypothesis that the density of pumping units are of the same order of magnitude for the present given species and for some other demosponges.
    Original languageEnglish
    JournalMarine Biology Research
    Volume15
    Issue number10
    Pages (from-to)531-540
    Number of pages11
    ISSN1745-1000
    DOIs
    Publication statusPublished - 2019

    Keywords

    • Exhalant jet speed
    • Filtration rate
    • Osculum area
    • Scaling
    • Aquiferous module
    • Contraction

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