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Facies

, 65:22 | Cite as

Close encounters in the substrate: when macroborers meet microborers

  • Christine H. L. SchönbergEmail author
  • Frank H. Gleason
  • Neele Meyer
  • Max Wisshak
Original Article
Part of the following topical collections:
  1. Bioerosion: An interdisciplinary approach

Abstract

Coral cores taken from Great Barrier Reef massive Porites sp. were assessed for bioerosion by the brown demosponge Cliona orientalis Thiele, 1900, but also yielded evidence for microbial bioerosion that was partly simultaneously active with the sponge bioerosion. The most common microborer traces throughout were Ichnoreticulina elegans (Radtke, 1991) produced by the chlorophyte alga Ostreobium quekettii Bornet and Flahault, 1889 and Scolecia serrata Radtke, 1991, likely a bacterial trace. Additional, less common traces belonging to the ichnogenera Saccomorpha and Orthogonum were attributed to fungal tracemakers. Especially I. elegans was found partly colonizing the so-called sponge scars, new surfaces formed by the bioeroding sponge, indicating that the alga was still actively bioeroding after infestation by the sponge. In addition, a very small but abundant trace was discovered directly associated with the sponge’s etching scars. It is a yet-undescribed trace apparently of either fungal or bacterial origin. We found evidence that this and some other microbial euendoliths can at least temporarily co-exist with the clionaid sponge, both eroding simultaneously, and potentially even being engaged in a yet-unspecified symbiotic relationship. Observations on such endolithic borer relationships across different taxa are very rare. Further studies are needed to elucidate the roles of different bioeroders as well as their potential interactions.

Keywords

Coral bioerosion Bioeroder interaction Cliona orientalis Euendoliths Ostreobium quekettii Fungal and bacterial microbioerosion 

Notes

Acknowledgements

MW’s and CS’s experimental work was conducted at the Orpheus Island Research Station and strongly relied on the support of the station staff. R. and D. Wisdom, N. Lee and C. Ansell assisted during field and experimental work. The experimental phase was financially supported by Deutsche Forschungsgemeinschaft (Grant Fr 1134/19) and co-funded by the Australian Institute of Marine Science. S. Harii (Tropical Biosphere Research Center University of the Ryukyus, Okinawa) provided Fig. 1b.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Oceans Graduate School and Oceans InstituteThe University of Western AustraliaCrawleyAustralia
  2. 2.School of Life and Environmental SciencesUniversity of SydneySydneyAustralia
  3. 3.Marine Research DepartmentSenckenberg am MeerWilhelmshavenGermany

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