TY - JOUR
T1 - Eyes and ears
T2 - A comparative approach linking the chemical composition of cod otoliths and eye lenses
AU - Stounberg, Jonathan
AU - Thomsen, Tonny Bernt
AU - Heredia, Benjamin Dominguez
AU - Hüssy, Karin
N1 - Funding Information:
This study was funded by the Danish Ministry for Environment and Food, and the European Maritime Fisheries Fund (grant No. 33113‐B‐19‐140).
Publisher Copyright:
© 2022 The Authors. Journal of Fish Biology published by John Wiley & Sons Ltd on behalf of Fisheries Society of the British Isles.
PY - 2022/10
Y1 - 2022/10
N2 - Fish eye lenses are a protein-based chronological recorder of microchemical constituents that are a potentially useful tool for interpretations of environmental, ecological and life-history experienced by fish. Here, we present the first study with data on the chemical composition of eye lenses from Baltic cod examined using laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) and compare these spatially resolved data to otoliths from the same fish also analysed by LA-ICPMS, measuring the isotopes 27Al, 137Ba, 43Ca, 52Cr, 65Cu, 57Fe, 39K, 7Li, 25Mg, 55Mn, 31P, 208Pb, 85Rb, 45Sc, 29Si, 88Sr, 47Ti, 50V, 149Yb, 66Zn and 90Zr. Comparison of the variation in element concentrations between eye lenses and otoliths from the same individuals showed minor similarities, suggesting a different governance in the uptake processes. A strong overlap between the concentric growth rings in the eye lenses and the otolith Sr periodicity was observed, where each consecutive minima in the chemical profile with high accuracy correspond to the width of each lens ring. No comparable trends were seen between growth rings and all other elements measured from both lenses and otoliths. The characteristic rings observed in cod eye lenses do not seem to represent seasonal fluctuation nor are they found to be directly linked to age. With this research, we provide a baseline study identifying elements in corresponding eye lenses and otoliths that show potential for unravelling the environmental and biological conditions experienced by fish.
AB - Fish eye lenses are a protein-based chronological recorder of microchemical constituents that are a potentially useful tool for interpretations of environmental, ecological and life-history experienced by fish. Here, we present the first study with data on the chemical composition of eye lenses from Baltic cod examined using laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) and compare these spatially resolved data to otoliths from the same fish also analysed by LA-ICPMS, measuring the isotopes 27Al, 137Ba, 43Ca, 52Cr, 65Cu, 57Fe, 39K, 7Li, 25Mg, 55Mn, 31P, 208Pb, 85Rb, 45Sc, 29Si, 88Sr, 47Ti, 50V, 149Yb, 66Zn and 90Zr. Comparison of the variation in element concentrations between eye lenses and otoliths from the same individuals showed minor similarities, suggesting a different governance in the uptake processes. A strong overlap between the concentric growth rings in the eye lenses and the otolith Sr periodicity was observed, where each consecutive minima in the chemical profile with high accuracy correspond to the width of each lens ring. No comparable trends were seen between growth rings and all other elements measured from both lenses and otoliths. The characteristic rings observed in cod eye lenses do not seem to represent seasonal fluctuation nor are they found to be directly linked to age. With this research, we provide a baseline study identifying elements in corresponding eye lenses and otoliths that show potential for unravelling the environmental and biological conditions experienced by fish.
KW - Atlantic cod
KW - chemical profile
KW - fish eye lenses
KW - growth rings
KW - LA-ICPMS
KW - otoliths
UR - http://www.scopus.com/inward/record.url?scp=85135136264&partnerID=8YFLogxK
U2 - 10.1111/jfb.15159
DO - 10.1111/jfb.15159
M3 - Article
AN - SCOPUS:85135136264
SN - 0022-1112
VL - 101
SP - 985
EP - 995
JO - Journal of Fish Biology
JF - Journal of Fish Biology
IS - 4
ER -