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First published online October 21, 2004
Journal of Experimental Biology 207, 4015-4024 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.01267
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Commentary

Tuna comparative physiology

Jeffrey B. Graham1,* and Kathryn A. Dickson2

1 Center for Marine Biotechnology and Biomedicine and Marine Biology Research Division, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093-0204, USA
2 Department of Biological Science, California State University Fullerton, Fullerton, CA 92834-6850, USA

* Author for correspondence (e-mail: jgraham{at}ucsd.edu)

Accepted 28 August 2004

Thunniform swimming, the capacity to conserve metabolic heat in red muscle and other body regions (regional endothermy), an elevated metabolic rate and other physiological rate functions, and a frequency-modulated cardiac output distinguish tunas from most other fishes. These specializations support continuous, relatively fast swimming by tunas and minimize thermal barriers to habitat exploitation, permitting niche expansion into high latitudes and to ocean depths heretofore regarded as beyond their range.

Key words: fish, evolution, phylogeny, metabolism, thunniform locomotion, regional endothermy


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