@article{fdi:010053125, title = {{W}hat's hiding behind ontogenetic delta {C}-13 variations in mollusk shells ? {N}ew insights from the great scallop ({P}ecten maximus)}, author = {{C}hauvaud, {L}. and {T}h{\'e}bault, {J}. and {C}lavier, {J}. and {L}orrain, {A}nne and {S}trand, {O}.}, editor = {}, language = {{ENG}}, abstract = {{M}ollusk shells contain geochemical information about environmental conditions that prevailed at the time of formation. {W}e investigated ontogenetic and seasonal variations of delta {C}-13 in calcitic shells of {P}ecten maximus. {O}ntogenetic variations of delta {C}-13(shell) in three large specimens collected in {N}orway, {F}rance, and {S}pain exhibited a similar linear decrease with increasing shell height. {W}e removed this linear drift (detrending). {T}hese three residual time series displayed variations that could be linked to environmental fluctuations. {T}o check it, we reanalyzed the isotopic datasets of {L}orrain et al. ({J}ournal of {E}xperimental {M}arine {B}iology and {E}cology 275:47-61, 2002, {G}eochimica et {C}osmochimica {A}cta 68:3509-3519, 2004), who worked on three scallops harvested in 2000 in the bay of {B}rest ({F}rance), a well-monitored ecosystem. {L}owest values of delta {C}-13(shell detrended) were recorded in all shells in late spring-early summer, most likely reflecting corresponding variations in food availability. {O}ur results indicate that ontogenetic and seasonal variations of delta {C}-13(shell) cannot be used as a proxy for past delta {C}-13({DIC}) variations but should be considered as promising tools for ecophysiological studies.}, keywords = {{S}callop shells ; {C}arbon isotopes ; {P}hytoplankton ; {O}ntogeny ; {P}roxy}, booktitle = {}, journal = {{E}stuaries and {C}oasts}, volume = {34}, numero = {2}, pages = {211--220}, ISSN = {1559-2723}, year = {2011}, DOI = {10.1007/s12237-010-9267-4}, URL = {https://www.documentation.ird.fr/hor/fdi:010053125}, }