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Simultaneous use of strontium:calcium and barium:calcium ratios in otoliths as markers of habitat: Application to the European eel (Anguilla anguilla) in the Adour basin, South West France

Abstract : Sr:Ca and Ba:Ca ratios in water from the Adour estuary show a clear relationship with the salinity of the surrounding water for salinities <20, while ratios are almost constant above this level of salinity. A positive relationship was observed for the Sr:Ca ratio, whereas it was inverse for the Ba:Ca ratio. These two elemental ratios were measured in the otoliths of the European eels (Anguilla anguilla L.) using femtosecond laser ablation linked to an ICP-MS (fs-LA-ICP-MS). There was a direct relationship between the elemental ratios recorded in eel otoliths and those found in water from fresh and marine areas, suggesting that Sr:Ca and Ba:Ca ratios in eel otoliths can be used as markers of habitat in this estuary. Continuous profiling allowed the determination of three behaviour patterns in terms of habitat: freshwater, estuary and migratory individuals. Finally, the above results support the simultaneous use of both ratios for a better understanding of the migratory contingents and also as a relevant method to avoid a misidentification of environmental migratory history due to the presence of vaterite crystal in the otolith matrix.
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https://hal.archives-ouvertes.fr/hal-01557314
Contributor : Hélène Tabouret <>
Submitted on : Thursday, July 6, 2017 - 9:44:24 AM
Last modification on : Thursday, March 5, 2020 - 7:12:35 PM

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Hélène Tabouret, Gilles Bareille, F. Claverie, Christophe Pécheyran, P. Prouzet, et al.. Simultaneous use of strontium:calcium and barium:calcium ratios in otoliths as markers of habitat: Application to the European eel (Anguilla anguilla) in the Adour basin, South West France. Marine Environmental Research, 2010, 70 (1), pp.35-45. ⟨10.1016/j.marenvres.2010.02.006⟩. ⟨hal-01557314⟩

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