The Influence and Interaction of Temperature, Salinity, and Upwelling on the Stable Isotopic Profiles of Strombid Gastropod Shells

Quantifying Upwelling and Freshening in Nearshore Tropical American Environments Using Stable Isotopes in Modern Gastropods

“…9C). No inverse O-C correlation was found in the bivalve and gastropod shells from the TEP upwelling areas studied by Geary et al (1992) and Bemis and Geary (1996). Geary et al (1992) attributed the absence of negative O-C correlations in this upwelling area to intense freshwater input during the rainy season, the interpretation adopted here.…”

“…Geary et al (1992) observed a significantly higher δ 18 O range for a strombid gastropod from the Gulf of Panama (4.5‰) vs one from a Caribbean non-upwelling area (1.5‰). Bemis and Geary (1996) obtained similar results for venerid bivalves.…”

“…Previous studies of modern mollusks from the TEP and SWC have successfully used oxygen isotopes to distinguish upwelling and non-upwelling environments (Geary et al 1992, Bemis andGeary 1996). Geary et al (1992) observed a significantly higher δ 18 O range for a strombid gastropod from the Gulf of Panama (4.5‰) vs one from a Caribbean non-upwelling area (1.5‰).…”

Provenance analysis of Olivella biplicata shell beads from the California and Oregon Coast by stable isotope fingerprinting

“…A second geochemical tracer is shell δ 13 C. In mollusks, shell δ 13 C records may be influenced by metabolic rate, trophic level, and reproductive condition, although the processes by which this influence occurs are not well understood [30,42,68,73,74,75,84,95]. Another major source of shell δ 13 C variation is changes in the δ 13 C of dissolved inorganic carbon (ΣCO 2 ) in seawater.…”

“…This data set records a little over one year's growth for this particular shell. These data begin with the season in which the animal died (i.e., when the shell was collected) in the early fall (sample = 1) and are preceded by summer (samples 7-17), spring into winter (samples 17-34), fall (samples [35][36][37][38][39][40][41], and terminate at the end of the penultimate summer (samples [42][43][44][45]. These data show that Olivella biplicata is recording seasonal fluctuations in δ 18 O, which we interpret as changes in SST.…”