Amino acid diagenesis in the marine bivalve Arctica islandica Linné from northwest European sites: Only time and temperature?
Abstract Collections of the molluscan species Arctica islandica from seven sites in Norway, Scotland and the North Sea, ranging in age from recent to Early Pleistocene, have been sampled for amino acid analyses. The shells were sampled in profiles through the valves at different distances from the u...
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crwiley:10.1002/jqs.3390090402 2024-06-02T08:02:56+00:00 Amino acid diagenesis in the marine bivalve Arctica islandica Linné from northwest European sites: Only time and temperature? Sejrup, Hans Petter Haugen, John‐Erik 1994 http://dx.doi.org/10.1002/jqs.3390090402 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3390090402 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3390090402 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 9, issue 4, page 301-309 ISSN 0267-8179 1099-1417 journal-article 1994 crwiley https://doi.org/10.1002/jqs.3390090402 2024-05-03T11:15:26Z Abstract Collections of the molluscan species Arctica islandica from seven sites in Norway, Scotland and the North Sea, ranging in age from recent to Early Pleistocene, have been sampled for amino acid analyses. The shells were sampled in profiles through the valves at different distances from the umbo. In the fossil material a general trend of increasing degree of isoleucine (lle) epimerisation and decreasing amino acid concentrations were found going from the inner part of the valve to the outer. Although less pronounced, there is a similar trend from the central part of the valve to the margin. As the concentration of alloisoleucine (alle) remains nearly constant, the observed changes in alle/lle ratios are a result of variations in the amount of isoleucine. The amino acid composition is fairly uniform in recent shells and the observed gradients are established in mid‐Holocene samples. Therefore, it is suggested that the gradients are established during rapid early degradation of the protein, possibly due to microbiological activity. Differences in alle/lle ratios observed in molluscs from sites of the same age and same thermal history could be explained by differences in the exposure to amino‐acid‐consuming microorganisms during the very early stage of diagenesis. Article in Journal/Newspaper Arctica islandica Wiley Online Library Norway Journal of Quaternary Science 9 4 301 309 |
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Wiley Online Library |
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language |
English |
description |
Abstract Collections of the molluscan species Arctica islandica from seven sites in Norway, Scotland and the North Sea, ranging in age from recent to Early Pleistocene, have been sampled for amino acid analyses. The shells were sampled in profiles through the valves at different distances from the umbo. In the fossil material a general trend of increasing degree of isoleucine (lle) epimerisation and decreasing amino acid concentrations were found going from the inner part of the valve to the outer. Although less pronounced, there is a similar trend from the central part of the valve to the margin. As the concentration of alloisoleucine (alle) remains nearly constant, the observed changes in alle/lle ratios are a result of variations in the amount of isoleucine. The amino acid composition is fairly uniform in recent shells and the observed gradients are established in mid‐Holocene samples. Therefore, it is suggested that the gradients are established during rapid early degradation of the protein, possibly due to microbiological activity. Differences in alle/lle ratios observed in molluscs from sites of the same age and same thermal history could be explained by differences in the exposure to amino‐acid‐consuming microorganisms during the very early stage of diagenesis. |
format |
Article in Journal/Newspaper |
author |
Sejrup, Hans Petter Haugen, John‐Erik |
spellingShingle |
Sejrup, Hans Petter Haugen, John‐Erik Amino acid diagenesis in the marine bivalve Arctica islandica Linné from northwest European sites: Only time and temperature? |
author_facet |
Sejrup, Hans Petter Haugen, John‐Erik |
author_sort |
Sejrup, Hans Petter |
title |
Amino acid diagenesis in the marine bivalve Arctica islandica Linné from northwest European sites: Only time and temperature? |
title_short |
Amino acid diagenesis in the marine bivalve Arctica islandica Linné from northwest European sites: Only time and temperature? |
title_full |
Amino acid diagenesis in the marine bivalve Arctica islandica Linné from northwest European sites: Only time and temperature? |
title_fullStr |
Amino acid diagenesis in the marine bivalve Arctica islandica Linné from northwest European sites: Only time and temperature? |
title_full_unstemmed |
Amino acid diagenesis in the marine bivalve Arctica islandica Linné from northwest European sites: Only time and temperature? |
title_sort |
amino acid diagenesis in the marine bivalve arctica islandica linné from northwest european sites: only time and temperature? |
publisher |
Wiley |
publishDate |
1994 |
url |
http://dx.doi.org/10.1002/jqs.3390090402 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3390090402 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3390090402 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Arctica islandica |
genre_facet |
Arctica islandica |
op_source |
Journal of Quaternary Science volume 9, issue 4, page 301-309 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.3390090402 |
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Journal of Quaternary Science |
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9 |
container_issue |
4 |
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301 |
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309 |
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1800747399559249920 |