@article{PAR00007487,
  title = {{S}trong biological controls on {S}r/{C}a ratios in aragonitic marine bivalve shells},
  author = {{G}illikin, {D}.{P}. and {L}orrain, {A}nne and {N}avez, {J}. and {T}aylor, {J}. and {A}ndr{\'e}, {L}. and {K}eppens, {E}. and {B}aeyens, {W}. and {D}ehairs, {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}t is well known that skeletal remains of carbonate secreting organisms can provide a wealth of information about past environments. {S}r/{C}a ratios have been successfully used as a temperature proxy in corals and sclerosponges. {P}revious work on aragonitic bivalve shells has not been conclusive, but suggests a major control of growth rate on {S}r/{C}a ratios. {A}s many studies have used bivalve growth rates to determine temperature, we tested if {S}r/{C}a ratios could predict temperature through its relationship with growth rate. {S}hells from the two species of clams from the same family (veneroidea) studied here, {S}axidomus giganteus and {M}ercenaria mercenaria, show vastly different seasonal {S}r/{C}a profiles. {A} strong relationship between average annual {S}r/{C}a ratios and annual growth rate was found in {S}. giganteus shells from both {W}ashington ({R}2 = 0.87) and {A}laska ({R}2 = 0.64), {USA}, but not in {M}. mercenaria shells from {N}orth {C}arolina, {USA}. {F}urthermore, the {S}r/{C}a - growth rate relationship was also evident upon a more detailed inspection of subannual growth rates in {S}. giganteus ({R}2 = 0.73). {A}lthough there were significant positive correlations between {S}r/{C}a ratios and temperature in {S}. giganteus shells, the correlations were weak (0.09 < {R}2 < 0.27) and thus {S}r/{C}a ratios cannot be used as a reliable temperature proxy in these species of aragonitic bivalves. {I}t is clear from this study that {S}r/{C}a ratios are not under thermodynamic control in either clam species, since thermodynamics predict a negative correlation between {S}r/{C}a ratios and temperature in aragonite. {T}his points towards dominance of biological processes in the regulation of {S}r2+. {T}his is also reflected by the largely differing {S}r/{C}a partition coefficients ({DS}r) in these shells ({DS}r ? 0.25), when compared to inorganic, coral, and sclerosponge studies ({DS}r ? 1), all of which show a negative dependence of {S}r/{C}a on temperature. {W}e suggest that caution be taken when using {S}r/{C}a in any biogenic aragonite as a temperature proxy when the {DS}r greatly deviates from one, as this indicates the dominance of biological controls on {S}r/{C}a ratios.},
  keywords = {{ETATS} {UNIS}},
  booktitle = {},
  journal = {{G}eochemistry {G}eophysics {G}eosystems},
  volume = {6 {Q}05009},
  numero = {},
  pages = {1--15},
  year = {2005},
  DOI = {10.1029/2004{GC}000874},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00007487},
}