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In this study, time-series stable isotope results (??13C and ??15N) from three deep-water Leiopathes glaberrima (Esper, 1788) specimens collected off the southeastern coast of the United States of America and one specimen from the Gulf of Mexico are presented. The specimens were collected live in 2004 and are estimated to be 200-500 yrs old based on 210Pb measurements and band counts. The ??13C and ??15N long-term trends are reproducible within and among specimens from a similar location, suggesting a common environmental influence. Three western Atlantic specimens have average ??13C values of -15.7???, -16.3???, and -16.1???, with the most depleted values from the oldest specimen. The oldest specimen records an enrichment in 13C of 0.5??? corresponding to the Little Ice Age. All three specimens show a depletion of 13C over the past 150 yrs corresponding to the ??13C Suess Effect. The fourth specimen from the Gulf of Mexico has an average ??13C value of -16.4??? and shows no trend in 13C value with time. All four specimens contain an enrichment in 15N over the most recent 75 yrs, with the largest enrichment (3???) in the Gulf of Mexico specimen. This enrichment is likely a result of increased terrestrial effluent (sewage and manure) reaching the offshore specimens. ?? 2007 Rosenstiel School of Marine and Atmospheric Science of the University of Miami.
Additional Publication Details
Stable isotope data from deep-water antipatharians: 400-Year records from the southeastern coast of the United States of America