期刊
PHYSIOLOGICAL AND BIOCHEMICAL ZOOLOGY
卷 80, 期 2, 页码 167-177出版社
UNIV CHICAGO PRESS
DOI: 10.1086/510637
关键词
-
Bluefin tuna are endothermic and have higher temperatures, heart rates, and cardiac outputs than tropical tuna. We hypothesized that the increased cardiovascular capacity to deliver oxygen in bluefin may be associated with the evolution of higher metabolic rates. This study measured the oxygen consumption of juvenile Pacific bluefin Thunnus orientalis and yellowfin tuna Thunnus albacares swimming in a swim- tunnel respirometer at 20 degrees C. Oxygen consumption (Mo-2) of bluefin (7.1-9.4 kg). ranged from 235 +/- 38 mg kg(-1) h(-1) at 0.85 body length (BL) s(-1) to 498 +/- 55 mg kg(-1) h(-1) at 1.80 BL s(-1). Minimal metabolic rates of swimming bluefin were 222 +/- 24 mg O-2 kg(-1) h(-1) at speeds of 0.75 to 1.0 BL s(-1). Mo-2 of T. albacares (3.7-7.4 kg) ranged from 164 +/- 18 mg kg(-1) h(-1) at 0.65 BL s(-1) to 405 +/- 105 mg kg(-1) h(-1) at 1.8 BL s(-1). Bluefin tuna had higher metabolic rates than yellowfin tuna at all swimming speeds tested. At a given speed, bluefin had higher metabolic rates and swam with higher tailbeat frequencies and shorter stride lengths than yellowfin. The higher Mo-2 recorded in Pacific bluefin tuna is consistent with the elevated cardiac performance and enhanced capacity for excitation-contraction coupling in cardiac myocytes of these fish. These physiological traits may underlie thermal-niche expansion of bluefin tuna relative to tropical tuna species.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据