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1 September 2009 Evaluation of the δ18O Value of the Submarine Cavernicolous Micro-Bivalve Carditella iejimensis as a Proxy for Palaeotemperature
Nagisa Yamamoto, Saburo Sakai, Akihisa Kitamura
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Abstract

The micro-bivalve Carditella iejimensis is less than 3.5 mm in shell height and lives in the surface sediment within a submarine cave at Ie Island, Okinawa Islands, Japan. A previous study interpreted that δ 18O-derived temperature obtained from C. iejimensis shells indicates the water temperature between May and July of each year. This interpretation is based mainly on a statistically significant correlation between shell size and δ 18O values obtained from empty shells. To assess the validity of this interpretation, we performed high-resolution isotopic analyses on 19 empty shells with the aim of examining ontogenetic variation in δ 18O values. The results reveal no systematic variation in δ 18O values, inconsistent with the previous interpretation. Our data indicate little or no influence of growth duration (shell size) on the δ 18O values of shells greater than 1 mm in height.

© by the Palaeontological Society of Japan
Nagisa Yamamoto, Saburo Sakai, and Akihisa Kitamura "Evaluation of the δ18O Value of the Submarine Cavernicolous Micro-Bivalve Carditella iejimensis as a Proxy for Palaeotemperature," Paleontological Research 13(3), 279-284, (1 September 2009). https://doi.org/10.2517/1342-8144-13.3.279
Received: 24 February 2009; Accepted: 1 July 2009; Published: 1 September 2009
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KEYWORDS
Carditella iejimensis
ontogenetic variations
oxygen isotope
palaeotemperature
submarine cavernicolous micro-bivalve
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