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Surface-water seasonality from stable isotope profiles of Littorina littorea shells; implications for paleoenvironmental reconstructions of coastal areas

Fredrik P. Andreasson, Birger Schmitz and Emma Jonsson
Surface-water seasonality from stable isotope profiles of Littorina littorea shells; implications for paleoenvironmental reconstructions of coastal areas
Palaios (June 1999) 14 (3): 273-281

Abstract

Intra-shell stable oxygen and carbon isotope profiles (delta (super 18) O, delta (super 13) C) were established for the common intertidal gastropod Littorina littorea to test if this species, thriving on the border between land and sea, would be suitable for studies on the paleoseasonality of coastal areas. Comparison of the L. littorea data with isotope records of a Mytilus edulis bivalve from the same locality as the L. littorea shells, and with literature data for M. edulis and M. trossulus, indicates that L. littorea would be useful for stable isotope studies on the coastal marine environment, whether concerning variability in physical (temperature and salinity) or biochemical (phytoplankton productivity) processes. The delta (super 18) O record representing the period prior to sexual maturity for each L. littorea shell is in agreement with the observed seasonality in surface-water temperature. This indicates that L. littorea precipitates shell calcite also during the temperature minimum in the winter. Responses in the shell delta (super 18) O to freshwater peaks in the spring suggest that oxygen isotope profiles of L. littorea also may be useful for detecting seasonal freshwater influx. The delta (super 13) C values for L. littorea are relatively high (0 per mil to 2.5 per mil) as compared with Mytilus (below 0.5 per mil), which may suggest that the calcite of L. littorea is precipitated close to isotopic equilibrium with delta (super 13) C of the dissolved inorganic carbon (DIC) of the water. This is probably related to a relatively low contribution of metabolic CO (sub 2) to the extrapallial fluid of L. littorea. A negative intra-shell correlation between delta (super 18) O and delta (super 13) C is found for L. littorea, reflecting the increased delta (super 13) C of the surface-water DIC in the summer related to the preferential incorporation of (super 12) C during phytoplankton photosynthesis. No correlation between delta (super 18) O and delta (super 13) C is found for the M. edulis specimen, probably (super because metabolic CO (sub 2) overprints the variations in) DIC delta (super 13) C.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 14
Serial Issue: 3
Title: Surface-water seasonality from stable isotope profiles of Littorina littorea shells; implications for paleoenvironmental reconstructions of coastal areas
Affiliation: Goteborg University, Department of Earth Sciences, Goteborg, Sweden
Pages: 273-281
Published: 199906
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 57
Accession Number: 1999-049710
Categories: Isotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch maps
N57°00'00" - N59°00'00", E07°00'00" - E11°30'00"
N55°15'00" - N69°15'00", E11°00'00" - E24°15'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 199917
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