Table_2_Ontogenetic δ15N Trends and Multidecadal Variability in Shells of the Bivalve Mollusk, Arctica islandica.XLSX
Bulk stable nitrogen isotope values of the carbonate-bound organic matrix in bivalve shells (δ 15 N CBOM ) are increasingly used to assess past food web dynamics, track anthropogenic nitrogen pollution and reconstruct hydrographic changes. However, it remains unresolved if the δ 15 N CBOM values are...
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ftfrontimediafig:oai:figshare.com:article/16916125 2023-05-15T15:22:35+02:00 Table_2_Ontogenetic δ15N Trends and Multidecadal Variability in Shells of the Bivalve Mollusk, Arctica islandica.XLSX Bernd R. Schöne Qian Huang 2021-11-02T04:15:49Z https://doi.org/10.3389/fmars.2021.748593.s002 https://figshare.com/articles/dataset/Table_2_Ontogenetic_15N_Trends_and_Multidecadal_Variability_in_Shells_of_the_Bivalve_Mollusk_Arctica_islandica_XLSX/16916125 unknown doi:10.3389/fmars.2021.748593.s002 https://figshare.com/articles/dataset/Table_2_Ontogenetic_15N_Trends_and_Multidecadal_Variability_in_Shells_of_the_Bivalve_Mollusk_Arctica_islandica_XLSX/16916125 CC BY 4.0 CC-BY Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering nitrogen isotopes sclerochronology particulate organic matter ontogeny physiology periostracum shell-bound proteins multidecadal climate variability Dataset 2021 ftfrontimediafig https://doi.org/10.3389/fmars.2021.748593.s002 2021-11-04T00:01:24Z Bulk stable nitrogen isotope values of the carbonate-bound organic matrix in bivalve shells (δ 15 N CBOM ) are increasingly used to assess past food web dynamics, track anthropogenic nitrogen pollution and reconstruct hydrographic changes. However, it remains unresolved if the δ 15 N CBOM 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, δ 15 N CBOM values from the long chronologies show a general decrease through lifetime by −0.006‰ per year. The most likely reason for the observed δ 15 N CBOM 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 δ 15 N CBOM 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. Dataset Arctica islandica Ocean quahog Frontiers: Figshare |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering nitrogen isotopes sclerochronology particulate organic matter ontogeny physiology periostracum shell-bound proteins multidecadal climate variability |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering nitrogen isotopes sclerochronology particulate organic matter ontogeny physiology periostracum shell-bound proteins multidecadal climate variability Bernd R. Schöne Qian Huang Table_2_Ontogenetic δ15N Trends and Multidecadal Variability in Shells of the Bivalve Mollusk, Arctica islandica.XLSX |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering nitrogen isotopes sclerochronology particulate organic matter ontogeny physiology periostracum shell-bound proteins multidecadal climate variability |
description |
Bulk stable nitrogen isotope values of the carbonate-bound organic matrix in bivalve shells (δ 15 N CBOM ) are increasingly used to assess past food web dynamics, track anthropogenic nitrogen pollution and reconstruct hydrographic changes. However, it remains unresolved if the δ 15 N CBOM 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, δ 15 N CBOM values from the long chronologies show a general decrease through lifetime by −0.006‰ per year. The most likely reason for the observed δ 15 N CBOM 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 δ 15 N CBOM 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 |
Dataset |
author |
Bernd R. Schöne Qian Huang |
author_facet |
Bernd R. Schöne Qian Huang |
author_sort |
Bernd R. Schöne |
title |
Table_2_Ontogenetic δ15N Trends and Multidecadal Variability in Shells of the Bivalve Mollusk, Arctica islandica.XLSX |
title_short |
Table_2_Ontogenetic δ15N Trends and Multidecadal Variability in Shells of the Bivalve Mollusk, Arctica islandica.XLSX |
title_full |
Table_2_Ontogenetic δ15N Trends and Multidecadal Variability in Shells of the Bivalve Mollusk, Arctica islandica.XLSX |
title_fullStr |
Table_2_Ontogenetic δ15N Trends and Multidecadal Variability in Shells of the Bivalve Mollusk, Arctica islandica.XLSX |
title_full_unstemmed |
Table_2_Ontogenetic δ15N Trends and Multidecadal Variability in Shells of the Bivalve Mollusk, Arctica islandica.XLSX |
title_sort |
table_2_ontogenetic δ15n trends and multidecadal variability in shells of the bivalve mollusk, arctica islandica.xlsx |
publishDate |
2021 |
url |
https://doi.org/10.3389/fmars.2021.748593.s002 https://figshare.com/articles/dataset/Table_2_Ontogenetic_15N_Trends_and_Multidecadal_Variability_in_Shells_of_the_Bivalve_Mollusk_Arctica_islandica_XLSX/16916125 |
genre |
Arctica islandica Ocean quahog |
genre_facet |
Arctica islandica Ocean quahog |
op_relation |
doi:10.3389/fmars.2021.748593.s002 https://figshare.com/articles/dataset/Table_2_Ontogenetic_15N_Trends_and_Multidecadal_Variability_in_Shells_of_the_Bivalve_Mollusk_Arctica_islandica_XLSX/16916125 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2021.748593.s002 |
_version_ |
1766353222227722240 |