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Digestive enzymes in marine invertebrates from hydrothermal vents and other reducing environments

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Abstract

The present study demonstrates the potential hydrolytic activities in the symbiont-containing tissues of the vent invertebrates Riftia pachyptila, Bathymodiolus thermophilus (collected in 1991 at the East Pacific Rise) and the shallow-water bivalve Lucinoma aequizonata (collected in 1991 from the Santa Barbara Basin). Activities of phosphatases, esterases, β-glucuronidase and leucineaminopeptidase were comparable to those of digestive tract tissues of other marine invertebrates. A lack in most glycosidases as well as in trypsin and chymotrypsin was observed. Activities of lysozyme and chitobiase were rather high. In all vent invertebrates with symbionts and in L. aequizonata, the symbiont-containing tissues and the symbiont-free tissues had similar levels of enzymatic activities, indicating that polymeric nutrients could be hydrolysed after release from the symbionts and cellular uptake. The high activities of α-fucosidase in all vent invertebrates as well as in the shallow-water bivalve L. aequizonata could point to the existence of a yet undescribed substrate available to hydrolysation. The ectosymbionts-carrying polychaete Alvinella pompejana (collected in 1991 at the East Pacific Rise, EPR) shows high lysozyme activities in its gut, consistent with the proposed food source of bacteria. For the vent crab Bythogrea thermydron (also collected in 1991 at the EPR) hydrolytic activities were highest in the gut, dominated by esterase and peptidase activities which support their proposed carnivorous food source. A snail and a limpet collected from R. pachyptila tubes showed high levels of chitobiase suggesting a food source of grazed bacteria or ingested R. pachyptila tube.

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Authors and Affiliations

  1. Alfred-Wegener-Institut für Polar- und Meeresforschung, Postfach 120161, D-27515, Bremerhaven, Germany

    A. Boetius

  2. Scripps Institution of Oceanography 0202, University of California San Diego, 92093, La Jolla, Califormia, USA

    H. Felbeck

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  1. A. Boetius
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  2. H. Felbeck
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Communicated by O. Kinne, Oldendorf/Luhe

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Boetius, A., Felbeck, H. Digestive enzymes in marine invertebrates from hydrothermal vents and other reducing environments. Marine Biology 122, 105–113 (1995). https://doi.org/10.1007/BF00349283

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  • DOI: https://doi.org/10.1007/BF00349283

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