Publication Type |
Journal Article |
School or College |
College of Science |
Department |
Biology |
Creator |
Carrier, David R. |
Other Author |
Seymour, Roger S.; Bennett-Stamper, Christina L.; Johnston, Sonya D.; Grigg, Gordon C. |
Title |
Evidence for endothermic ancestors of crocodiles at the stem of archosaur evolution |
Date |
2004 |
Description |
Physiological, anatomical, and developmental features of the crocodilian heart support the paleontological evidence that the ancestors of living crocodilians were active and endothermic, but the lineage reverted to ectothermy when it invaded the aquatic, ambush predator niche. In endotherms, there is a functional nexus between high metabolic rates, high blood flow rates, and complete separation of high systemic blood pressure from low pulmonary blood pressure in a four-chambered heart. Ectotherms generally lack all of these characteristics, but crocodilians retain a four-chambered heart. |
Type |
Text |
Publisher |
University of Chicago Press - Journals |
Volume |
77 |
First Page |
1051 |
Last Page |
1067 |
Subject |
Endothermy; ectothermy; Archosaur evolution; Archosaurs; Crocodilian heart |
Subject LCSH |
Crocodiles; Crocodiles -- Evolution |
Language |
eng |
Bibliographic Citation |
Seymour, R. S., Bennett-Stamper, C. L., Johnston, S. D., Carrier, D. R., & Grigg, G. C. (2004). Evidence for endothermic ancestors of crocodiles at the stem of archosaur evolution. Physiologival and Biochemical Zoology, 77, 1051-67. |
Rights Management |
(c) University of Chicago Press http://www.journals.uchicago.edu/ |
Format Medium |
application/pdf |
Format Extent |
7,159,682 bytes |
Identifier |
ir-main,8815 |
ARK |
ark:/87278/s6p84w33 |
Setname |
ir_uspace |
ID |
703653 |
Reference URL |
https://collections.lib.utah.edu/ark:/87278/s6p84w33 |