Ontogenetic δ15N trends and multidecadal variability in shells of the bivalve mollusk, Arctica islandica
Bulk stable nitrogen isotope values of the carbonate-bound organic matrix in bivalve shells (δ15NCBOM) are increasingly used to assess past food web dynamics, track anthropogenic nitrogen pollution and reconstruct hydrographic changes. However, it remains unresolved if the δ15NCBOM values are also a...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Johannes Gutenberg-Universität Mainz
2021
|
Subjects: | |
Online Access: | https://openscience.ub.uni-mainz.de/handle/20.500.12030/6556 https://hdl.handle.net/20.500.12030/6556 https://doi.org/10.25358/openscience-6546 |
id |
ftunivmainzpubl:oai:openscience.ub.uni-mainz.de:20.500.12030/6556 |
---|---|
record_format |
openpolar |
spelling |
ftunivmainzpubl:oai:openscience.ub.uni-mainz.de:20.500.12030/6556 2023-05-15T15:22:30+02:00 Ontogenetic δ15N trends and multidecadal variability in shells of the bivalve mollusk, Arctica islandica Schöne, Bernd R. Huang, Qian 2021 https://openscience.ub.uni-mainz.de/handle/20.500.12030/6556 https://hdl.handle.net/20.500.12030/6556 https://doi.org/10.25358/openscience-6546 eng eng Johannes Gutenberg-Universität Mainz http://doi.org/10.25358/openscience-6546 https://openscience.ub.uni-mainz.de/handle/20.500.12030/6556 2296-7745 CC BY https://creativecommons.org/licenses/by/4.0/ openAccess CC-BY Frontiers in Marine Science. 8. -. 2021. -. -. 748593 ddc:550 Zeitschriftenaufsatz publishedVersion Text doc-type:article 2021 ftunivmainzpubl https://doi.org/20.500.12030/6556 https://doi.org/10.25358/openscience-6546 2022-09-15T11:48:27Z Bulk stable nitrogen isotope values of the carbonate-bound organic matrix in bivalve shells (δ15NCBOM) are increasingly used to assess past food web dynamics, track anthropogenic nitrogen pollution and reconstruct hydrographic changes. However, it remains unresolved if the δ15NCBOM values are also affected by directed ontogenetic trends which can bias ecological and environmental interpretations. This very aspect is tested here with modern and fossil specimens of the long-lived ocean quahog, Arctica islandica, collected from different sites and water depths in the NE Atlantic Ocean. As demonstrated, δ15NCBOM values from the long chronologies show a general decrease through lifetime by −0.006‰ per year. The most likely reason for the observed δ15NCBOM decline is a change in the type of proteins synthesized at different stages of life, i.e., a gradual shift from proteins rich in strongly fractionating, trophic amino acids during youth toward proteins rich in source amino acids during adulthood. Aside from this ontogenetic trend, distinct seasonal to multidecadal δ15NCBOM variations (ca. 50 to 60 years; up to 2.90‰) were identified. Presumably, the latter were governed by fluctuations in nutrient supply mediated by the Atlantic Multidecadal Variation (AMV) and Atlantic Meridional Overturning Circulation (AMOC) combined with changes in nitrate utilization by photoautotrophs and associated Rayleigh fractionation processes. Findings underline the outstanding potential of bivalve shells in studies of trophic ecology, oceanography and pollution, but also highlight the need for compound-specific isotope analyses. Article in Journal/Newspaper Arctica islandica Ocean quahog Gutenberg Open Science (Open-Science-Repository of the Johannes Gutenberg-University Mainz) |
institution |
Open Polar |
collection |
Gutenberg Open Science (Open-Science-Repository of the Johannes Gutenberg-University Mainz) |
op_collection_id |
ftunivmainzpubl |
language |
English |
topic |
ddc:550 |
spellingShingle |
ddc:550 Schöne, Bernd R. Huang, Qian Ontogenetic δ15N trends and multidecadal variability in shells of the bivalve mollusk, Arctica islandica |
topic_facet |
ddc:550 |
description |
Bulk stable nitrogen isotope values of the carbonate-bound organic matrix in bivalve shells (δ15NCBOM) are increasingly used to assess past food web dynamics, track anthropogenic nitrogen pollution and reconstruct hydrographic changes. However, it remains unresolved if the δ15NCBOM values are also affected by directed ontogenetic trends which can bias ecological and environmental interpretations. This very aspect is tested here with modern and fossil specimens of the long-lived ocean quahog, Arctica islandica, collected from different sites and water depths in the NE Atlantic Ocean. As demonstrated, δ15NCBOM values from the long chronologies show a general decrease through lifetime by −0.006‰ per year. The most likely reason for the observed δ15NCBOM decline is a change in the type of proteins synthesized at different stages of life, i.e., a gradual shift from proteins rich in strongly fractionating, trophic amino acids during youth toward proteins rich in source amino acids during adulthood. Aside from this ontogenetic trend, distinct seasonal to multidecadal δ15NCBOM variations (ca. 50 to 60 years; up to 2.90‰) were identified. Presumably, the latter were governed by fluctuations in nutrient supply mediated by the Atlantic Multidecadal Variation (AMV) and Atlantic Meridional Overturning Circulation (AMOC) combined with changes in nitrate utilization by photoautotrophs and associated Rayleigh fractionation processes. Findings underline the outstanding potential of bivalve shells in studies of trophic ecology, oceanography and pollution, but also highlight the need for compound-specific isotope analyses. |
format |
Article in Journal/Newspaper |
author |
Schöne, Bernd R. Huang, Qian |
author_facet |
Schöne, Bernd R. Huang, Qian |
author_sort |
Schöne, Bernd R. |
title |
Ontogenetic δ15N trends and multidecadal variability in shells of the bivalve mollusk, Arctica islandica |
title_short |
Ontogenetic δ15N trends and multidecadal variability in shells of the bivalve mollusk, Arctica islandica |
title_full |
Ontogenetic δ15N trends and multidecadal variability in shells of the bivalve mollusk, Arctica islandica |
title_fullStr |
Ontogenetic δ15N trends and multidecadal variability in shells of the bivalve mollusk, Arctica islandica |
title_full_unstemmed |
Ontogenetic δ15N trends and multidecadal variability in shells of the bivalve mollusk, Arctica islandica |
title_sort |
ontogenetic δ15n trends and multidecadal variability in shells of the bivalve mollusk, arctica islandica |
publisher |
Johannes Gutenberg-Universität Mainz |
publishDate |
2021 |
url |
https://openscience.ub.uni-mainz.de/handle/20.500.12030/6556 https://hdl.handle.net/20.500.12030/6556 https://doi.org/10.25358/openscience-6546 |
genre |
Arctica islandica Ocean quahog |
genre_facet |
Arctica islandica Ocean quahog |
op_source |
Frontiers in Marine Science. 8. -. 2021. -. -. 748593 |
op_relation |
http://doi.org/10.25358/openscience-6546 https://openscience.ub.uni-mainz.de/handle/20.500.12030/6556 2296-7745 |
op_rights |
CC BY https://creativecommons.org/licenses/by/4.0/ openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.12030/6556 https://doi.org/10.25358/openscience-6546 |
_version_ |
1766353155886415872 |