Incorporation of magnesium into fish otoliths

Determining contribution from water and diet

S Woodcock, A Munro, David Crook, B Gillanders

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    Magnesium is a commonly measured element in otolith chemistry analysis and is often included in the suite of elements used to discriminate fish from different environments. Poor relations between Mg in water and otolith chemistry are, however, often found. We examined the uptake of Mg into the otoliths of a freshwater fish (silver perch Bidyanus bidyanus), to determine the extent to which this element can be used to record previous environmental conditions. Silver perch fingerlings were reared for 30days in water with four concentrations of Mg (14.5, 36.6, 52.1 and 69.6mgL -1) and fed on a diet supplemented with a combination of natural Mg and enriched 26Mg at five concentrations (1496, 1626, 1902, 2005 and 2036?gg -1). Enriched 26Mg was added to the diet to achieve a 26Mg/ 25Mg ratio that was different from the natural ratio, such that the relative contribution of water and diet to Mg incorporated into otoliths could be determined. Enriching the diet with 26Mg resulted in an isotope shift in the otolith of silver perch from the natural 26Mg/ 25Mg ratio of 1.10-1.42; however, this was not as high as the ratio in the diet (> 3.7) suggesting that the fish did not fully incorporate Mg from the diet. Water was the primary source of otolith Mg, contributing on average>80% to otolith Mg (range 74-95%). The fact that Mg concentrations in the otolith did not change in response to Mg concentrations in the water or diet, indicates that Mg is likely physiologically regulated and therefore is not a reliable environmental indicator. 
    Original languageEnglish
    Pages (from-to)12-21
    Number of pages10
    JournalGeochimica et Cosmochimica Acta
    Volume94
    DOIs
    Publication statusPublished - 1 Oct 2012

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    Nutrition
    otolith
    Fish
    Magnesium
    magnesium
    diet
    Water
    fish
    Silver
    silver
    water
    environmental indicator
    incorporation
    Isotopes
    environmental conditions
    isotope

    Cite this

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    title = "Incorporation of magnesium into fish otoliths: Determining contribution from water and diet",
    abstract = "Magnesium is a commonly measured element in otolith chemistry analysis and is often included in the suite of elements used to discriminate fish from different environments. Poor relations between Mg in water and otolith chemistry are, however, often found. We examined the uptake of Mg into the otoliths of a freshwater fish (silver perch Bidyanus bidyanus), to determine the extent to which this element can be used to record previous environmental conditions. Silver perch fingerlings were reared for 30days in water with four concentrations of Mg (14.5, 36.6, 52.1 and 69.6mgL -1) and fed on a diet supplemented with a combination of natural Mg and enriched 26Mg at five concentrations (1496, 1626, 1902, 2005 and 2036?gg -1). Enriched 26Mg was added to the diet to achieve a 26Mg/ 25Mg ratio that was different from the natural ratio, such that the relative contribution of water and diet to Mg incorporated into otoliths could be determined. Enriching the diet with 26Mg resulted in an isotope shift in the otolith of silver perch from the natural 26Mg/ 25Mg ratio of 1.10-1.42; however, this was not as high as the ratio in the diet (> 3.7) suggesting that the fish did not fully incorporate Mg from the diet. Water was the primary source of otolith Mg, contributing on average>80{\%} to otolith Mg (range 74-95{\%}). The fact that Mg concentrations in the otolith did not change in response to Mg concentrations in the water or diet, indicates that Mg is likely physiologically regulated and therefore is not a reliable environmental indicator. ",
    keywords = "biological uptake, concentration (composition), diet, environmental conditions, environmental indicator, magnesium, otolith, physiological response, Bairdiella chrysoura, Bidyanus bidyanus",
    author = "S Woodcock and A Munro and David Crook and B Gillanders",
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    Incorporation of magnesium into fish otoliths : Determining contribution from water and diet. / Woodcock, S; Munro, A; Crook, David; Gillanders, B.

    In: Geochimica et Cosmochimica Acta, Vol. 94, 01.10.2012, p. 12-21.

    Research output: Contribution to journalArticleResearchpeer-review

    TY - JOUR

    T1 - Incorporation of magnesium into fish otoliths

    T2 - Determining contribution from water and diet

    AU - Woodcock, S

    AU - Munro, A

    AU - Crook, David

    AU - Gillanders, B

    PY - 2012/10/1

    Y1 - 2012/10/1

    N2 - Magnesium is a commonly measured element in otolith chemistry analysis and is often included in the suite of elements used to discriminate fish from different environments. Poor relations between Mg in water and otolith chemistry are, however, often found. We examined the uptake of Mg into the otoliths of a freshwater fish (silver perch Bidyanus bidyanus), to determine the extent to which this element can be used to record previous environmental conditions. Silver perch fingerlings were reared for 30days in water with four concentrations of Mg (14.5, 36.6, 52.1 and 69.6mgL -1) and fed on a diet supplemented with a combination of natural Mg and enriched 26Mg at five concentrations (1496, 1626, 1902, 2005 and 2036?gg -1). Enriched 26Mg was added to the diet to achieve a 26Mg/ 25Mg ratio that was different from the natural ratio, such that the relative contribution of water and diet to Mg incorporated into otoliths could be determined. Enriching the diet with 26Mg resulted in an isotope shift in the otolith of silver perch from the natural 26Mg/ 25Mg ratio of 1.10-1.42; however, this was not as high as the ratio in the diet (> 3.7) suggesting that the fish did not fully incorporate Mg from the diet. Water was the primary source of otolith Mg, contributing on average>80% to otolith Mg (range 74-95%). The fact that Mg concentrations in the otolith did not change in response to Mg concentrations in the water or diet, indicates that Mg is likely physiologically regulated and therefore is not a reliable environmental indicator. 

    AB - Magnesium is a commonly measured element in otolith chemistry analysis and is often included in the suite of elements used to discriminate fish from different environments. Poor relations between Mg in water and otolith chemistry are, however, often found. We examined the uptake of Mg into the otoliths of a freshwater fish (silver perch Bidyanus bidyanus), to determine the extent to which this element can be used to record previous environmental conditions. Silver perch fingerlings were reared for 30days in water with four concentrations of Mg (14.5, 36.6, 52.1 and 69.6mgL -1) and fed on a diet supplemented with a combination of natural Mg and enriched 26Mg at five concentrations (1496, 1626, 1902, 2005 and 2036?gg -1). Enriched 26Mg was added to the diet to achieve a 26Mg/ 25Mg ratio that was different from the natural ratio, such that the relative contribution of water and diet to Mg incorporated into otoliths could be determined. Enriching the diet with 26Mg resulted in an isotope shift in the otolith of silver perch from the natural 26Mg/ 25Mg ratio of 1.10-1.42; however, this was not as high as the ratio in the diet (> 3.7) suggesting that the fish did not fully incorporate Mg from the diet. Water was the primary source of otolith Mg, contributing on average>80% to otolith Mg (range 74-95%). The fact that Mg concentrations in the otolith did not change in response to Mg concentrations in the water or diet, indicates that Mg is likely physiologically regulated and therefore is not a reliable environmental indicator. 

    KW - biological uptake

    KW - concentration (composition)

    KW - diet

    KW - environmental conditions

    KW - environmental indicator

    KW - magnesium

    KW - otolith

    KW - physiological response

    KW - Bairdiella chrysoura

    KW - Bidyanus bidyanus

    UR - http://www.scopus.com/inward/record.url?scp=84864935599&partnerID=8YFLogxK

    U2 - 10.1016/j.gca.2012.07.003

    DO - 10.1016/j.gca.2012.07.003

    M3 - Article

    VL - 94

    SP - 12

    EP - 21

    JO - Geochimica et Cosmochimica Acta

    JF - Geochimica et Cosmochimica Acta

    SN - 0016-7037

    ER -