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Divergent respiratory and cardiovascular responses to hypoxia in bar-headed geese and Andean birds
Citation
Lague, SL and Chua, B and Alza, L and Scott, GR and Frappell, PB and Zhong, Y and Farrell, AP and McCracken, KG and Wang, Y and Milsom, WK, Divergent respiratory and cardiovascular responses to hypoxia in bar-headed geese and Andean birds, Journal of Experimental Biology, 220, (22) pp. 4186-4194. ISSN 0022-0949 (2017) [Refereed Article]
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Copyright Statement
Copyright 2017. Published by The Company of Biologists Ltd. Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0) https://creativecommons.org/licenses/by/3.0/
Abstract
Many high-altitude vertebrates have evolved increased capacities in their oxygen transport cascade (ventilation, pulmonary diffusion, circulation and tissue diffusion), enhancing oxygen transfer from the atmosphere to mitochondria. However, the extent of interspecies variation in the control processes that dictate hypoxia responses remains largely unknown. We compared the metabolic, cardiovascular and respiratory responses to progressive decreases in inspired oxygen levels of bar-headed geese (Anser indicus), birds that biannually migrate across the Himalayan mountains, with those of Andean geese (Chloephaga melanoptera) and crested ducks (Lophonetta specularioides), lifelong residents of the high Andes. We show that Andean geese and crested ducks have evolved fundamentally different mechanisms for maintaining oxygen supply during low oxygen (hypoxia) from those of bar-headed geese. Bar-headed geese respond to hypoxia with robust increases in ventilation and heart rate, whereas Andean species increase lung oxygen extraction and cardiac stroke volume. We propose that transient high-altitude performance has favoured the evolution of robust convective oxygen transport recruitment in hypoxia, whereas life-long high-altitude residency has favoured the evolution of structural enhancements to the lungs and heart that increase lung diffusion and stroke volume.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | altitude, ventilation, cardiac output, metabolism, goose, duck |
| Research Division: | Biological Sciences |
| Research Group: | Zoology |
| Research Field: | Animal physiological ecology |
| Objective Division: | Expanding Knowledge |
| Objective Group: | Expanding knowledge |
| Objective Field: | Expanding knowledge in the biological sciences |
| UTAS Author: | Frappell, PB (Professor Peter Frappell) |
| ID Code: | 123615 |
| Year Published: | 2017 |
| Web of Science® Times Cited: | 21 |
| Deposited By: | Ecology and Biodiversity |
| Deposited On: | 2018-01-15 |
| Last Modified: | 2018-05-30 |
| Downloads: | 152 View Download Statistics |
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