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    Water, not food, contributes the majority of strontium and barium deposited in the otoliths of a marine fish

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    m311p125.pdf (86.10Kb)
    Date
    2006-04-13
    Author
    Walther, Benjamin D.  Concept link
    Thorrold, Simon R.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4507
    As published
    https://doi.org/10.3354/meps311125
    DOI
    10.3354/meps311125
    Keyword
     Otolith; Element uptake; Sr isotope; Ba isotope; Water sources 
    Abstract
    We quantified the relative contributions of water and food to strontium (Sr) and barium (Ba) deposited in otoliths of juvenile mummichogs Fundulus heteroclitus. Fish were reared in seawater spiked with 86Sr and 137Ba significantly beyond natural values to obtain distinct isotopic signatures for water and food. Element abundances (Sr:Ca and Ba:Ca) and isotope ratios (88Sr:86Sr and 138Ba:137Ba) were quantified in water samples using solution-based inductively coupled plasma-mass spectrometry (ICP-MS), and 88Sr:86Sr and 138Ba:137Ba ratios in otoliths were quantified using laser ablation ICP-MS. The relative contributions of water and food sources to otolith aragonite were assessed using a simple linear isotope mixing model. Water sources contributed 83% of Sr and 98% of Ba in otoliths formed in spiked seawater. Our results indicate that water chemistry is the dominant factor controlling the uptake of Sr and Ba in the otoliths of marine fishes. Thus, chemical signatures recorded in the otoliths of marine fishes should reflect the ambient water composition of these elements at the time of deposition.
    Description
    Author Posting. © Inter-Research, 2006. This article is posted here by permission of Inter-Research for personal use, not for redistribution. The definitive version was published in Marine Ecology Progress Series 311 (2006): 125-130, doi:10.3354/meps311125.
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    • Biology
    Suggested Citation
    Marine Ecology Progress Series 311 (2006): 125-130
     

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