Bioerosion in shells of modern Nautilus - Results from the investigation of live caught specimens

Conference contribution
(Abstract of lecture)


Publication Details

Author(s): Seuß B, Wisshak M, Mapes RH, Landman N
Publication year: 2014
Language: English


Abstract

Over the past 20 years, Royal H. Mapes a nd colleagues caught specimens
of the living Nautilus in various regions of the Southern Pacific Ocean. Many
of these shells were encrusted by epiliths (foraminiferans, ostracods, goose
barnacles). Additionally, the shells showed strong signs of bioerosion, i.e.
numerous small irregular holes penetrating deep into the shell. Because bioerosion
is a major factor in the degradation of carbonate skeletal material a study was
carried out on four shells (one specimen of N. pompilius from Vanuatu, three
specimens of N. macromphalus from New Caledonia) to investigate these holes in
detail. The shells were broken into pieces and a set of epoxy resin casts was prepared
for analyses with the scanning electron microscope.



The analyses revealed that the small holes are the openings of two, so
far undescribed, microbioerosion traces which are most likely produced by naked
foraminiferans. Traces of these foraminiferans commonly occur in dense clusters
in the shell of up to many dozen individuals. Because these traces were not
reported from other substrates before, we conclude, that these boring naked
foraminiferans are host specific.



In addition to the two boring foraminiferans we found two further traces
on the shells outside of Nautilus. These etchings derive from test-bearing
foraminiferans, likely from some genera of the Rosalinidae. As of now, there is
no indication that any of the foraminiferans, naked or with a test, were
parasitic but instead they used the Nautilus shells as substrate to settle respectively
to live in. Our study presents the first report on syn-vivo bioerosion in Nautilus
shells and demonstrates that shell degradation in Nautilus already starts
during lifetime of the cephalopod.


FAU Authors / FAU Editors

Seuß, Barbara Dr.
Lehrstuhl für Paläoumwelt


How to cite

APA:
Seuß, B., Wisshak, M., Mapes, R.H., & Landman, N. (2014). Bioerosion in shells of modern Nautilus - Results from the investigation of live caught specimens. Paper presentation at 9th International Symposium 'Cephalopods present and past, Zürich, CH.

MLA:
Seuß, Barbara, et al. "Bioerosion in shells of modern Nautilus - Results from the investigation of live caught specimens." Presented at 9th International Symposium 'Cephalopods present and past, Zürich 2014.

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Last updated on 2018-06-12 at 09:38