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Body polarity and mineral selectivity in the demosponge Chondrosia reniformis
Bavestrello, G.; Benatti, U.; Calcinai, B.; Cattaneo-Vietti, R.; Cerrano, C.; Favre, A.; Giovine, M.; Lanza, S.; Pronzato, R.; Sara, M. (1998). Body polarity and mineral selectivity in the demosponge Chondrosia reniformis. Biol. Bull. 195(2): 120-125. https://dx.doi.org/10.2307/1542819
In: The Biological Bulletin. Marine Biological Laboratory: Lancaster. ISSN 0006-3185; e-ISSN 1939-8697
Peer reviewed article  
Beschikbaar in  Auteurs 
Trefwoorden
    Chondrosia reniformis Nardo, 1847 [WoRMS]
    Marien/Kust
Auteurs  Top 
  • Bavestrello, G.
  • Benatti, U.
  • Calcinai, B.
  • Cattaneo-Vietti, R.
  • Cerrano, C.
  • Favre, A.
  • Giovine, M.
  • Lanza, S.
  • Pronzato, R.
  • Sara, M.
Abstract
    The skeleton of the common Mediterranean demosponge Chondrosia reniformis lacks endogenous spicules; but exogenous siliceous material is selectively incorporated into its collagenous ectosome, strengthening this layer. Nevertheless, the settling of sponge buds during asexual reproduction necessitates an active incorporation of the calcareous substratum through the sponge lower ectosome. This fact suggests the presence of a polarity in the sponge, with the lower surface selecting primarily carbonates, and the upper surface selecting exclusively silicates and quartz. Our observations under experimental conditions showed that the strong selectivity of the upper ectosome is realized only when the sponge is fixed to the substratum; if detached, the sponge incorporates both quartz and carbonates. In laboratory experiments, the incapacity of both kinds of ectosome to regenerate into a new complete sponge suggests that this polarity arises early in ontogeny.
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