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Fossilisation of Fish Soft Tissue in Oxidative Microniches of Anoxic Sediments.

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Title: Fossilisation of Fish Soft Tissue in Oxidative Microniches of Anoxic Sediments.
Authors: Elson, Amy L.1 (AUTHOR), Schwark, Lorenz1,2 (AUTHOR), Greenwood, Paul F.1 (AUTHOR), Tripp, Madison1,3 (AUTHOR), Holman, Alex I.1 (AUTHOR), Böttcher, Michael E.4,5,6 (AUTHOR), Hopper, Peter1 (AUTHOR), Madden, Robert H. C.7 (AUTHOR), Brosnan, Luke M.1 (AUTHOR), Whiteside, Jessica H.8 (AUTHOR), Poropat, Stephen F.1 (AUTHOR), Grande, Lance9 (AUTHOR), Rickard, William D. A.10 (AUTHOR), Grice, Kliti1 (AUTHOR) k.grice@curtin.edu.au
Source: Environmental Microbiology. Oct2025, Vol. 27 Issue 10, p1-11. 11p.
Subjects: Fossilization, Phosphate minerals, Sulfur bacteria, Analytical geochemistry, Organic compounds, Sediments, Tissues
Abstract: Organic analyses of past organisms enhance our understanding of Earth's evolutionary history, complementing the macrofossil record. Biomolecular remains are typically vulnerable to diagenetic mineralisation, but can persist in exceptional depositional settings such as Lagerstätten. Their preservation is usually linked to anoxic conditions that exclude aerobic degraders. However, we report intact skin tissue of the fossil fish Diplomystus dentatus from the Fossil Basin Lagerstätte (USA), preserved through phosphate permineralisation in an oxygen‐enriched microenvironment. Notably, only the skin with scales retained tissue integrity, and this organic material was closely associated with fluorapatite absent from the surrounding matrix. Geochemical analyses revealed higher oxidation states in the skin than in vertebrae and bones, likely due to early degradation of the fatty acid‐rich dermis. Redox‐sensitive biomarkers and isotopic data (δ15N) indicated a less reducing environment in the skin region compared to bones and the eye, yet more reducing than the surrounding sediment. This localised oxygen enrichment fostered sulphide‐oxidising bacteria, evidenced by mineral sulphates (barite) found only in the skin. Phosphatisation was likely driven by dermal breakdown and the release of H+, reducing alkalinity and enabling phosphate mineralisation over the carbonate system. [ABSTRACT FROM AUTHOR]
Copyright of Environmental Microbiology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 188898796
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PubType: Academic Journal
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  Data: Fossilisation of Fish Soft Tissue in Oxidative Microniches of Anoxic Sediments.
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  Data: <searchLink fieldCode="AR" term="%22Elson%2C+Amy+L%2E%22">Elson, Amy L.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Schwark%2C+Lorenz%22">Schwark, Lorenz</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Greenwood%2C+Paul+F%2E%22">Greenwood, Paul F.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tripp%2C+Madison%22">Tripp, Madison</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Holman%2C+Alex+I%2E%22">Holman, Alex I.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Böttcher%2C+Michael+E%2E%22">Böttcher, Michael E.</searchLink><relatesTo>4,5,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hopper%2C+Peter%22">Hopper, Peter</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Madden%2C+Robert+H%2E+C%2E%22">Madden, Robert H. C.</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Brosnan%2C+Luke+M%2E%22">Brosnan, Luke M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Whiteside%2C+Jessica+H%2E%22">Whiteside, Jessica H.</searchLink><relatesTo>8</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Poropat%2C+Stephen+F%2E%22">Poropat, Stephen F.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Grande%2C+Lance%22">Grande, Lance</searchLink><relatesTo>9</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rickard%2C+William+D%2E+A%2E%22">Rickard, William D. A.</searchLink><relatesTo>10</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Grice%2C+Kliti%22">Grice, Kliti</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> k.grice@curtin.edu.au</i>
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  Data: <searchLink fieldCode="JN" term="%22Environmental+Microbiology%22">Environmental Microbiology</searchLink>. Oct2025, Vol. 27 Issue 10, p1-11. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Fossilization%22">Fossilization</searchLink><br /><searchLink fieldCode="DE" term="%22Phosphate+minerals%22">Phosphate minerals</searchLink><br /><searchLink fieldCode="DE" term="%22Sulfur+bacteria%22">Sulfur bacteria</searchLink><br /><searchLink fieldCode="DE" term="%22Analytical+geochemistry%22">Analytical geochemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Organic+compounds%22">Organic compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Sediments%22">Sediments</searchLink><br /><searchLink fieldCode="DE" term="%22Tissues%22">Tissues</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Organic analyses of past organisms enhance our understanding of Earth's evolutionary history, complementing the macrofossil record. Biomolecular remains are typically vulnerable to diagenetic mineralisation, but can persist in exceptional depositional settings such as Lagerstätten. Their preservation is usually linked to anoxic conditions that exclude aerobic degraders. However, we report intact skin tissue of the fossil fish Diplomystus dentatus from the Fossil Basin Lagerstätte (USA), preserved through phosphate permineralisation in an oxygen‐enriched microenvironment. Notably, only the skin with scales retained tissue integrity, and this organic material was closely associated with fluorapatite absent from the surrounding matrix. Geochemical analyses revealed higher oxidation states in the skin than in vertebrae and bones, likely due to early degradation of the fatty acid‐rich dermis. Redox‐sensitive biomarkers and isotopic data (δ15N) indicated a less reducing environment in the skin region compared to bones and the eye, yet more reducing than the surrounding sediment. This localised oxygen enrichment fostered sulphide‐oxidising bacteria, evidenced by mineral sulphates (barite) found only in the skin. Phosphatisation was likely driven by dermal breakdown and the release of H+, reducing alkalinity and enabling phosphate mineralisation over the carbonate system. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Environmental Microbiology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1111/1462-2920.70188
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      – Code: eng
        Text: English
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        PageCount: 11
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      – SubjectFull: Fossilization
        Type: general
      – SubjectFull: Phosphate minerals
        Type: general
      – SubjectFull: Sulfur bacteria
        Type: general
      – SubjectFull: Analytical geochemistry
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      – SubjectFull: Organic compounds
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      – SubjectFull: Sediments
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      – SubjectFull: Tissues
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      – TitleFull: Fossilisation of Fish Soft Tissue in Oxidative Microniches of Anoxic Sediments.
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              Text: Oct2025
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