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The influence and interaction of temperature, salinity, and upwelling on the stable isotopic profiles of strombid gastropod shells

Dana H. Geary, Timothy A. Brieske and Bryan E. Bemis
The influence and interaction of temperature, salinity, and upwelling on the stable isotopic profiles of strombid gastropod shells
Palaios (February 1992) 7 (1): 77-85

Abstract

We constructed stable isotope profiles for three specimens of the gastropod Strombus from localities on the Pacific coast of Panama, the Caribbean coast of Panama, and the eastern coast of Florida. The three shells belong to individuals from two conspecific populations and a closely related species. All are from very shallow water (<10 m deep). Strong contrasts among localities in seasonal temperature, salinity, and up-welling are apparent in the isotope profiles. The Pacific shell profile exhibits pronounced variation in delta (super 18) O, corresponding to strong seasonal variation in temperature and salinity. At this locality, the coolest months exhibit normal marine salinity, whereas the warmest months are characterized by reduced salinity. Therefore, temperature and salinity-correlated effects reinforce each other, to yield delta (super 18) O cycles with an amplitude of 4.5 per mil. By contrast, the delta (super 13) C profile for the Pacific shell is relatively flat, probably reflecting the mitigating effects of upwelling, temperature, and runoff on shell delta (super 13) C. The Caribbean shell exhibits relatively flat profiles for both delta (super 18) O and delta (super 13) C, reflecting both reduced seasonal variation in temperature and salinity, and the fact that the influences of these variables on shell isotopic ratios at least partly cancel each other out at this locality. The Florida shell exhibits moderate seasonal variability in both delta (super 18) O and delta (super 13) C. The significant correlation between delta (super 18) O and delta (super 13) C in the Florida shell may reflect a temperature-dependent fractionation of carbon isotopes without confounding changes in salinity or upwelling, or a temperature-dependent vital effect related to growth rates, or both.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 7
Serial Issue: 1
Title: The influence and interaction of temperature, salinity, and upwelling on the stable isotopic profiles of strombid gastropod shells
Affiliation: Univ. Wis., Dep. Geol. and Geophys., Madison, WI, United States
Pages: 77-85
Published: 199202
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 52
Accession Number: 1992-019695
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch map
N09°00'00" - N22°00'00", W78°00'00" - W60°00'00"
N24°30'00" - N31°00'00", W87°30'00" - W80°00'00"
N07°10'00" - N09°40'00", W83°01'60" - W77°10'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 1992
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