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Multiple taxon-multiple locality approach to providing oxygen isotope evidence for warm-blooded theropod dinosaurs

Henry C. Fricke and Raymond R. Rogers
Multiple taxon-multiple locality approach to providing oxygen isotope evidence for warm-blooded theropod dinosaurs
Geology (Boulder) (September 2000) 28 (9): 799-802

Abstract

Oxygen isotope ratios of fossil remains of coexisting taxa from several different localities can be used to help investigate dinosaur thermoregulation. Focusing on the Late Cretaceous, oxygen isotope ratios of crocodile tooth enamel from four separate localities exhibit less of a decrease with latitude than do ratios of tooth enamel from coexisting theropod dinosaurs. A shallower latitudinal gradient for crocodiles is consistent with how oxygen isotope ratios should vary for heterothermic animals having body temperatures coupled with their environments ("cold blooded"), while a steeper gradient for theropods is consistent with how these ratios should vary for homeothermic animals having constant body temperatures independent of their environments ("warm blooded"). This inferred homoethermy in theropods is likely due to higher rates of metabolic heat production relative to crocodiles and is not an artifact of body size.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 28
Serial Issue: 9
Title: Multiple taxon-multiple locality approach to providing oxygen isotope evidence for warm-blooded theropod dinosaurs
Affiliation: Carnegie Institution of Washington, Geophysical Laboratory, Washington, DC, United States
Pages: 799-802
Published: 200009
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 24
Accession Number: 2000-073547
Categories: Vertebrate paleontologyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
S25°40'00" - S11°52'00", E43°00'00" - E50°30'00"
Secondary Affiliation: Macalester College, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200023
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