Biogenic and diagenetic indicators in archaeological and modern otoliths: Potential and limits of high definition synchrotron micro-XRF elemental mapping

Cook, Phil; Languille, Marie-Angélique; Dufour, Élise; Mocuta, Cristian; Tombret, Olivier; Fortuna, F.; Bertrand, Loïc

doi:10.1016/j.chemgeo.2015.08.017

Cited by 15 publications

(19 citation statements)

References 94 publications

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“…Letter annotations in the far right column correspond to points in Fig. et al 27 XRF maps additional to those in Fig. 1 are present in the latter article.…”

Section: Synchrotron Methodsmentioning

confidence: 91%

“…21,26 When Sr content is used as a palaeoenvironmental proxy, its local mode of incorporation and stability within the organic fraction of otoliths and/or in the aragonite biomineral are likely of crucial inuence on its longterm behaviour, and therefore its reliability. 27 No previous work reports on elemental speciation in ancient sh otoliths. Working at the microscale is necessary as alteration could occur not only in the whole otolith, but also in localised zones.…”

Section: Introductionmentioning

confidence: 99%

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Strontium speciation in archaeological otoliths

Cook

Dufour

Languille

et al. 2016

J. Anal. At. Spectrom.

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“…Letter annotations in the far right column correspond to points in Fig. et al 27 XRF maps additional to those in Fig. 1 are present in the latter article.…”

Section: Synchrotron Methodsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Strontium speciation in archaeological otoliths

Cook

Dufour

Languille

et al. 2016

J. Anal. At. Spectrom.

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“…To reduce potential bias due to otolith shape alteration, we included elemental composition in our analyses. Diagenetic processes have been shown to not D r a f t have significantly altered the elemental composition of fossil otoliths, when compared to modern specimens (Degens 1969;Kern 2012;Cook 2015;Cook 2016).…”

Section: R a F Tmentioning

confidence: 99%

Classification of otoliths of fishes common in the Santa Barbara Basin based on morphology and chemical composition

Jones

Checkley

2017

Can. J. Fish. Aquat. Sci.

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Morphological and chemical features of fish otoliths are used to distinguish between populations and stocks. We hypothesized that these features can also be used to distinguish between fishes of different taxonomic groups common in and near the Santa Barbara Basin, including mesopelagic, pelagic, and demersal fish. Sagittal otoliths obtained from 905 fish representing six taxonomic groups were imaged, and 12 geometric and 59 elliptic Fourier morphometric features were extracted. A subset of 143 otoliths was also analyzed for Li, Na, Mg, K, Mn, Sr, and Ba. We used chemical composition in addition to morphology because the latter may be altered between otolith formation and analysis. Two sets of classifiers were made: one using only morphometric features and one using both morphometric and element features. Random forest analysis was generally superior to discriminant function analysis. Highest classification success, evaluated using cross-validation and otoliths of masked identity, was achieved with multiple feature types. The ten strongest discriminatory features of all available feature types were used in the final classification models. Our method is applicable to the classification of otoliths recovered from guts, feces, middens, and sediments as well to classify other biological objects.

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“…Aer a detailed investigation of possible sources, the high levels of Hg in the hair of one individual was attributed to the medical use of mercury-based compounds, most likely for lice infestation. High denition elemental maps of sections of sh otoliths (ear bones) were recorded using m-SRXRF spectrometry by Cook et al 319 Four archaeological and two modern otoliths from the Pacic Coast of South America were examined and diagenetic alterations in elemental signals were reported, although these did not affect compositions beyond a few hundred micrometres of the surface.…”

Section: Archaeological and Cultural Heritagementioning

confidence: 99%