Heterogeneity of otolith chemical composition from two-dimensional mapping: Relationship with biomineralization mechanisms and implications for microchemistry analyses.

Autor: de Pontual H; Ifremer DECOD (Ecosystem Dynamics and Sustainability), Ifremer, INRAE, Institut Agro, Centre Bretagne, HALGO, LBH, Plouzané, France., MacKenzie KM; Ifremer HMMN (Channel and North Sea Fisheries Research Unit), Boulogne-sur-Mer, France., Tabouret H; UMR 5254, Université de Pau et des Pays de l'Adour (UPPA), Avenue de l'Université, Pau, France., Daverat F; INRAE, UMR 1224 Ecobiop, Aquapôle, Saint-Pée-sur-Nivelle, France., Mahé K; Ifremer HMMN (Channel and North Sea Fisheries Research Unit), Boulogne-sur-Mer, France., Pecheyran C; UMR 5254, Université de Pau et des Pays de l'Adour (UPPA), Avenue de l'Université, Pau, France., Hüssy K; National Institute of Aquatic Resources, Section for Oceans and Arctic, Technical University of Denmark, Kongens Lyngby, Denmark.
Jazyk: angličtina
Zdroj: Journal of fish biology [J Fish Biol] 2024 Jan; Vol. 104 (1), pp. 20-33. Date of Electronic Publication: 2023 Sep 22.
DOI: 10.1111/jfb.15561
Abstrakt: Although otoliths are widely used as archives to infer life-history traits and habitat use in fishes, their biomineralization process remains poorly understood. This lack of knowledge is problematic as it can lead to misinterpretation of the different types of signals (e.g., optical or chemical) that provide basic data for research in fish ecology, fisheries management, and species conservation. Otolith calcification relies on a complex system involving a pericrystalline fluid, the endolymph, whose organic and inorganic compositions are spatially heterogeneous for some constituents. This property stems from the particular structure of the calcifying saccular epithelium. In this study, we explored the spatial heterogeneity of elemental incorporation in otoliths for two species of high economic interest, European hake Merluccius merluccius (L. 1758) and European sea bass Dicentrarchus labrax (L. 1758). Two-dimensional mappings of chemical elements were obtained using UV high-repetition-rate femtosecond laser ablation (fs-LA) system coupled to a high-resolution inductively coupled plasma sector field mass spectrometer analyses on transverse sections of sagittae. Results highlighted a clear asymmetry between proximal (sulcus) and distal (antisulcus) concentrations for elements such as magnesium (Mg), phosphorus (P), manganese (Mn), and potassium (K) with concentration gradient directions that varied depending on the element. Strontium (Sr) and barium (Ba) did not show a proximo-distal gradient. These results are discussed in light of current knowledge on the endolymph composition and the mechanisms that lead to its compartmentalization, highlighting the need for further research on otolith biomineralization. Operational implications for studies based on otolith chemical composition are also discussed with emphasis on advice for sampling strategies to avoid analytical biases and the need for in-depth analyses of analytical settings before comparing otolith signatures between species or geographical areas.
(© 2023 Fisheries Society of the British Isles.)
Databáze: MEDLINE
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