@article{fdi:010054731, title = {{G}rowth anomalies in {P}rotothaca thaca ({M}ollusca, {V}eneridae) shells as markers of {ENSO} conditions}, author = {{L}azareth, {C}laire {E}. and {L}asne, {G}r{\'e}gory and {O}rtlieb, {L}uc}, editor = {}, language = {{ENG}}, abstract = {{E}nvironmental variations can be recorded in bivalve shells, and this proxy information can be crucial for paleoceanographic studies in regions where other proxies (e.g. corals) are absent. {W}e present the first sclerochronological study of {P}rotothaca thaca ({M}ollusca, {V}eneridae), a common upper subtidal bivalve, characterized by a high temperature tolerance, from the {SE} {P}acific {O}cean (12 to 45 degrees {S}). {P}. thaca is present in archaeological deposits and {H}olocene marine terraces, making it a potentially useful paleo-environmental recorder, particularly in respect to {E}l {N}ino {S}outhern {O}scillation ({ENSO}) reconstructions. {T}he sclerochronological analysis of recent {P}. thaca shells from {P}eru and {C}hile was done by microscopy of thin sections and acetate peel replicates; it shows that a clear 'summer check' ({SC}) is formed in the shell when sea surface temperature ({SST}) exceeds 18 degrees {C} for several weeks. {U}nder {L}a {N}ina conditions in summer, {SC}s can be absent due to lower {SST} and enhanced productivity. {D}uring the strong 1997-1998 {E}l {N}ino, long-lasting high summer {SST} produced an {SC} > 520 mu m wide. {T}he relative width of {SC} on fossil shells may thus be an indicator of paleo-{ENSO} events. {O}ur sclerochronological analysis has established a temporal framework in {P}. thaca shells, providing precise time-series analytical profiles, which is a prerequisite for future calibration of geochemical proxies.}, keywords = {bivalve ; {P}rotothaca thaca ; {P}eru ; {C}hile ; sclerochronology ; {E}l {N}ino {S}outhern {O}scillation ; {PEROU} ; {CHILI} ; {ANDES}}, booktitle = {}, journal = {{C}limate {R}esearch}, volume = {30}, numero = {3}, pages = {263--269}, ISSN = {0936-577{X}}, year = {2006}, DOI = {10.3354/cr030263}, URL = {https://www.documentation.ird.fr/hor/fdi:010054731}, }