Abstract
Three taxonomically distant sponges Pericharax heteroraphis, Jaspis stellifera and Neofibularia irata contain phenotypically similar bacterial symbionts which differ from bacteria in the ambient water. These symbionts are predominant in the sponges and were detected after computer analysis of 526 heterotrophic bacterial strains tested for 76 characters. These facultative anaerobic symbionts metabolize a wide range of compounds and may be important in removing waste products while the sponges are not circulating water. The bacteria produce sticky-mucoid colonies and thus would contribute to sponge structural rigidity. The fourth sponge Ircinia wistarii contains a mixed aerobic population similar to that in the ambient water. The majority of the bacteria are located around the inhalant canals, facilitating the uptake of dissolved organic matter and oxygen from the incoming water.
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Communicated by G.F. Humphrey, Sydney
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Wilkinson, C.R. Microbial associations in sponges. II. Numerical analysis of sponge and water bacterial populations. Mar. Biol. 49, 169–176 (1978). https://doi.org/10.1007/BF00387116
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DOI: https://doi.org/10.1007/BF00387116