Iodine content of fish otoliths in species found in diverse habitats

Expansion of aquatic deoxygenation has altered the quality and availability of habitats and worsened body condition for many fish species through past decades. Identifying complementary chemical redox proxies in fish otoliths, in addition to Mn/Ca, would strengthen the ability to identify hypoxia ex...

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Bibliographic Details
Published in:Environmental biology of fishes 2022-03, Vol.105 (3), p.351-367
Main Authors: He, Ruliang, Limburg, Karin E., Walther, Benjamin D., Samson, Melvin A., Lu, Zunli
Format: Article
Language:English
Subjects:
Abiotic factors
Animal Systematics/Taxonomy/Biogeography
Aquatic habitats
Biomedical and Life Sciences
Body condition
Brackishwater environment
Coastal waters
Cores
Deoxygenation
Ecological effects
Environment
Estuaries
Fish
Freshwater & Marine Ecology
Habitat availability
Habitat changes
Habitats
Hypoxia
Iodine
Life Sciences
Manganese
Marine sediments
Maternal transfer
Mineralization
Nature Conservation
Organic matter
Otoliths
Oxidoreductions
Phylogeny
Ratios
Sediments
Species
Strontium
Zoology
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Summary:Expansion of aquatic deoxygenation has altered the quality and availability of habitats and worsened body condition for many fish species through past decades. Identifying complementary chemical redox proxies in fish otoliths, in addition to Mn/Ca, would strengthen the ability to identify hypoxia exposure in a diversity of aquatic habitats. I/Ca ratios have been used in marine sediments and bio-mineralized materials for reconstruction of past redox conditions. In order to explore influences from various endogenous and exogenous processes, a large data set of I/Ca ratios from cores of otoliths, including fishes from fresh, estuarine, and coastal waters across 30 species within 10 taxonomic orders, were reported with other chemical proxies (Mn/Ca and Sr/Ca) using LA-ICP-MS. Our results suggest no single abiotic factor, including redox condition and salinity derived from Mn/Ca and Sr/Ca, predicts I/Ca values, while they may be correlated for specific fish species. Iodine may be related to organic matter in the cores of otoliths for some species. Maternal transfer, habitat change, dietary source, phylogeny, and ecology may also influence I/Ca ratios. Based on these exploratory results, we suggest a range of future research directions to further evaluate the factors controlling biomineralization of otolith iodine and its utility as a redox proxy.
ISSN:0378-1909
1573-5133
DOI:10.1007/s10641-022-01228-6