@article{fdi:010069420,
  title = {{H}igh-resolution nitrogen stable isotope sclerochronology of bivalve shell carbonate-bound organics},
  author = {{G}illikin, {D}. {P}. and {L}orrain, {A}nne and {J}olivet, {A}. and {K}elemen, {Z}. and {C}hauvaud, {L}. and {B}ouillon, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{N}itrogen stable isotope ratios (delta {N}-15) of organic material have successfully been used to track food-web dynamics, nitrogen baselines, pollution, and nitrogen cycling. {E}xtending the delta {N}-15 record back in time has not been straightforward due to a lack of suitable substrates in which delta {N}-15 records are faithfully preserved, thus sparking interest in utilizing skeletal carbonate-bound organic matter ({CBOM}) in mollusks, corals, and foraminifera. {H}ere we test if calcite {P}ecten maximus shells from the {B}ay of {B}rest and the {F}rench continental shelf can be used as an archive of delta {N}-15 values over a large environmental gradient and at a high temporal resolution (approximately weekly). {B}ulk {CBOM} delta {N}-15 values from the growing tip of shells collected over a large nitrogen isotope gradient were strongly correlated with adductor muscle tissue delta {N}-15 values ({R}-2 = 0.99, n = 6, p < 0.0001). {W}e were able to achieve weekly resolution (on average) over the growing season from sclerochronological profiles of three shells, which showed large seasonal variations up to 3.4%. {H}owever, there were also large inter-specimen differences (up to 2.5%) between shells growing at the same time and location. {G}enerally, high-resolution shell delta {N}-15 values follow soft-tissue delta {N}-15 values, but soft-tissues integrate more time, hence soft-tissue data are more time-averaged and smoothed. {M}useum-archived shells from the 1950s, 1965, and 1970s do not show a large difference in delta {N}-15 values through time despite expected increasing {N} loading to the {B}ay over this time, which could be due to anthropogenic {N} sources with contrasting values. {C}ompiling shell {CBOM} delta {N}-15 data from several studies suggests that the offset between soft-tissue and shell delta {N}-15 values ({D}tissue-shell) differs between calcite and aragonite shells. {W}e hypothesize that this difference is caused by differences in amino acids used in constructing the different minerals, which should be specific to the {C}a{CO}3 polymorph being constructed. {F}uture work should use compound specific isotope analyses ({CSIA}) to test this hypothesis, and to determine whether certain amino acids could specifically track {N} sources or possibly identify amino acids that are more resistant to diagenesis in fossil shells. {I}n conclusion, bivalve shell {CBOM} delta {N}-15 values can be used in a similar manner to soft-tissue delta {N}-15 values, and can track various biogeochemical events at a very high-resolution.},
  keywords = {{N}itrogen isotope ; {P}ollution ; {M}etabolism ; {C}arbonate bound organic matter ; {I}sotope time averaging ; {E}utrophication},
  booktitle = {},
  journal = {{G}eochimica et {C}osmochimica {A}cta},
  volume = {200},
  numero = {},
  pages = {55--66},
  ISSN = {0016-7037},
  year = {2017},
  DOI = {10.1016/j.gca.2016.12.008},
  URL = {https://www.documentation.ird.fr/hor/fdi:010069420},
}