Elemental distribution in cephalopod statoliths: NanoSIMS provides new insights into nano-scale structure |
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Authors: | Karsten Zumholz Thor Hansteen Francois Hillion Francois Horreard Uwe Piatkowski |
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Institution: | (1) Leibniz-Institute of Marine Sciences, Düsternbrooker Weg 20, Kiel, 24105, Germany;(2) CAMECA, Courbevoie, France |
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Abstract: | We have applied the novel analytical method NanoSIMS to cephalopod statoliths for the first time in order to analyse their
chemical microstructure, using a spatial resolution of 400 nm. This technique makes it possible to analyse in situ nano-scale
chemical variations between increment layers. In statoliths of the boreoatlantic armhook squid Gonatus fabricii, we found distinct concentration patterns indicating a periodicity in strontium and sodium distributions. Sr and Na show
a negative relation, both elements showing alternating patterns where the increments vary in width between approximately 1
and 5 μm. Results suggest, that aragonite deposited during the night is rich in Na and poor in Sr, while aragonite deposited
during the day is rich in Sr and poor in Na. This study demonstrates the excellent suitability of NanoSIMS for nano-scale
microchemical analyses of aragonite, providing new information on calcification processes and individual life histories. Possible
future fields of application include not only cephalopod statoliths, but also virtually all biomineralized tissues in aquatic
organisms like fish otoliths, gastropod statoliths, bivalve shells, foraminifers and corals. |
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Keywords: | Cephalopods Statolith NanoSIMS Aragonite Strontium Sodium |
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