High resolution analysis for the response of life history traits of mollusks to marine environment during cold and warm geologic periods

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Response of life history traits of modern and Cretaceous mollusks to the present and past marine environment has been investigated by means of sclerochronological and geochemical analyses. As a result, modern bivalves living in northwestern Pacific cold water environments have a long life span and preserve a long-term environmental record in their internal shell increments. Stable oxygen isotopic analysis of well-preserved planktonic and benthic foraminiferal tests and bivalve shells from the Upper Cretaceous of the North American mid-continent reveals slightly colder sea surface and bottom temperatures for the Western Interior Seaways and Northwest Atlantic continental shelf during the Late Cretaceous than those during the mid-Cretaceous. Also, this study demonstrates that Late Cretaceous bivalves from these marine realms had life history traits that were similar to those of modern bivalves from a lower latitude warm marine environment.