Dinosaurs, endothermy and blood pressure


THE recent resurgence of speculation about dinosaur physiology and behaviour has resulted in two notable and debatable interpretations. Bakker1 summarises evidence of several investigators and concludes that dinosaurs were endothermic. Coombs2, among others, suggests that the sauropod dinosaurs were mainly terrestrial, only occasionally entering shallow water. These hypotheses might well be viewed in the light of one line of evidence concerning the relationship between height of animals and hydrostatic pressures in the vascular system. Size alone can provide important insights into dinosaur cardiovascular performance which necessarily relates to the questions of endothermy and habitat. This report shows firstly, that high arterial blood pressures in large dinosaurs are consistent with the proposal that they were endothermic. Secondly, I suggest that if the long-necked sauropods were aquatic, they thereby avoided tremendous hydrostatic stresses on the cardiovascular system.

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  1. 1

    Bakker, R. T., Scient. Am., 232, 58–78 (1975).

    Article  Google Scholar 

  2. 2

    Coombs, W. P., Jr, Paleogeogr., Paleodimatol., Paleoecol., 17, 1–33 (1975).

    ADS  Article  Google Scholar 

  3. 3

    Rodbard, S., Brown, F., and Katz, L. N., Am. Heart J., 38, 863–871 (1949).

    CAS  Article  Google Scholar 

  4. 4

    Johansen, K., Resp. Physiol., 14, 193–210 (1972).

    CAS  Article  Google Scholar 

  5. 5

    Geddes, L. A., The Direct and Indirect Measurement of Blood Pressure. (Year-book Medical Publishers, Chicago, 1970).

    Google Scholar 

  6. 6

    Bakker, R. T., Evolution, 25, 636–658 (1971).

    Article  Google Scholar 

  7. 7

    Bennett, A. F., and Dalzell, B., Evolution, 27, 170–174 (1973).

    Article  Google Scholar 

  8. 8

    Feduccia, A., Evolution, 27, 166–169 (1973).

    Article  Google Scholar 

  9. 9

    Prosser, C. L., and Brown, F. A., Jr, Comparative Animal Physiology (Saunders, London, 1961).

    Google Scholar 

  10. 10

    Bakker, R. T., Nature, 238, 81–85 (1972).

    ADS  Article  Google Scholar 

  11. 11

    Ricqlès, A. de., C.r. hebd. Seanc. Acad. Sci Paris, 268, 782–785 (1969).

    Google Scholar 

  12. 12

    Hohnke, L. A., Nature, 244, 309–310 (1973).

    ADS  CAS  Article  Google Scholar 

  13. 13

    Lasiewski, R. C., and Calder, W. A., Jr, Resp. Physiol., 11, 152–166 (1971).

    CAS  Article  Google Scholar 

  14. 14

    Van Citters, R. L., Kemper, W. S., and Franklin, D. L., Science, 152, 384–386 (1966).

    ADS  CAS  Article  Google Scholar 

  15. 15

    Goss, R. J., in Cardiac Hypertrophy (edit. by Alpert, N. R.), 1–10 (Academic, New York, 1971).

    Google Scholar 

  16. 16

    Clark, A. J., Comparative Physiology of the Heart (Cambridge University Press, London, 1927).

    Google Scholar 

  17. 17

    Sandler, H., and Dodge, H. T., Circulation Res., 13, 91–104 (1963).

    CAS  Article  Google Scholar 

  18. 18

    Kurtén, B., The Age of the Dinosaurs (World University Library, London, 1968).

    Google Scholar 

  19. 19

    Romer, A. S., Vertebrate Paleontology (University of Chicago Press, 1945).

    Google Scholar 

Download references

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SEYMOUR, R. Dinosaurs, endothermy and blood pressure. Nature 262, 207–208 (1976). https://doi.org/10.1038/262207a0

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