MOLLUSK SHELLS OF PATELLA CRENATA (GASTROPODA: PATELLIDAE) FROM TENERIFE, CANARY ISLANDS, AS A LOW-LATITUDE PALEOCLIMATIC PROXY
We analyzed the δ18O values of live-collected Patella shells using two different sampling approaches. First, live-collected limpets were sampled using a manual Dremel drill along the calcitic shell margin, which provided bulk (averaged) δ18O values at the time of specimen collection. Second, several modern limpets were cross-sectioned from anterior to posterior parallel to the maximum growth axis and microsampled sequentially at high resolution using a Merchantek micromill.
Bulk shell margin δ18O values correlated negatively with observed SST (R2=0.95; p<0.001; n=98). These results suggest that the high-resolution oxygen isotope time series of Patella crenata records seasonal variations in SST. Ongoing oxygen isotope analyses from high-resolution micromilled samples will allow us to reconstruct SST at sub-monthly scale during the late Holocene using archaeological P. crenata from the Canary Islands.