Sr Isotope Ratios (87Sr/86Sr) in Water and Fish Otoliths as Estuarine Salinity Tracers : Case Studies from Three NW African Rivers
In: ISSN: 1559-2723 ; Estuaries and Coasts ; https://hal.science/hal-04056460 ; Estuaries and Coasts, 2022, 45, pp.1780-1802. ⟨10.1007/s12237-021-01041-x⟩, 2022
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International audience ; Variations of strontium isotope ratios (87Sr/86Sr) in river systems are increasingly utilised to geochemically trace origin and movement patterns of migratory fish species. Accretionary calcified structures, such as otoliths, preserve 87Sr/86Sr signatures of the surrounding water during a fish’s lifetime. In this study, we present 87Sr/86Sr measurements of water samples and catfish otoliths collected in the estuaries of the Sine-Saloum (Senegal), the Gambia River (The Gambia), and the Volta River (Ghana) to assess their systematics and relationships with salinity. The three rivers possess distinct hydrological properties resulting in variable degrees of correlations between 87Sr/86Sr and salinity. The Gambia River (87Sr/86Sr of ~ 0.71209) proved exceptionally preconditioned for the approach due to well-defined geochemical end-members, allowing for quantitative estimates of salinity based on otolith 87Sr/86Sr measurements. The Volta River (~ 0.71392) presents a more complex case due the possible influence of multiple water sources to the main channel, while the inverse salinity gradient and excessive evaporation in the Sine-Saloum estuary (~0.70915) impede any significant correlations between 87Sr/86Sr and salinity. Bulk otolith 87Sr/86Sr values in the Gambia River and Volta River clearly depicted a mixed influence of seawater and riverine compositions, strongly encouraging the application of this approach for geochemical fingerprinting of critical NW African species.
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Sr Isotope Ratios (87Sr/86Sr) in Water and Fish Otoliths as Estuarine Salinity Tracers : Case Studies from Three NW African Rivers
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Autor/in / Beteiligte Person: | Höpker, Sebastian N. ; Wu, Henry C. ; Lucassen, Friedrich ; Sadio, Oumar ; Brochier, Timothée ; Nuworkpor, Ishmael Y. ; Kasemann, Simone A. ; Merschel, Peter ; Westphal, Hildegard ; Leibniz Centre for Tropical Marine Research (ZMT) ; University of Bremen ; University of Waikato Hamilton ; Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) ; Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) ; Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) ; Institut de Recherche pour le Développement (IRD) ; Unité de modélisation mathématique et informatique des systèmes complexes Bondy (UMMISCO) ; Université de Yaoundé I-Institut de la francophonie pour l'informatique-Université Cheikh Anta Diop Dakar, Sénégal (UCAD)-Université Gaston Bergé (Saint-Louis, Sénégal)-Université Cadi Ayyad Marrakech (UCA)-Sorbonne Université (SU)-Institut de Recherche pour le Développement (IRD France-Nord ) ; Takoradi Technical University ; Projekt, DEAL |
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Zeitschrift: | ISSN: 1559-2723 ; Estuaries and Coasts ; https://hal.science/hal-04056460 ; Estuaries and Coasts, 2022, 45, pp.1780-1802. ⟨10.1007/s12237-021-01041-x⟩, 2022 |
Veröffentlichung: | HAL CCSD ; Springer Verlag, 2022 |
Medientyp: | academicJournal |
ISSN: | 1559-2723 |
DOI: | 10.1007/s12237-021-01041-x |
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