Increased fiber capillarization in flight muscle of finch at altitude
Abstract
We examined fiber capillarization and ultrastructure in the highly aerobic flight muscle of six gray crowned rosy finches (Leucosticte arctoa; mass 22.9 +/- 0.5 (SE) g) living at altitude (A; White Mountains of Eastern California; 4000 m) compared to eight sea-level (SL) house finches (Carpodacus mexicanus, mass, 19.8 +/- 0.6 g) of the same subfamily, Carduelinae. Capillary length per fiber volume (A, 10,400 +/- 409 mm(-2); SL, 7513 +/- 423; P < 0.001) and capillary-to-fiber ratio (A, 2.32 +/- 0.07; SL, 1.85 +/- 0.06; P < 0.001) were significantly greater in A, with no difference in fiber cross-sectional area compared to SL. Capillary geometry was significantly different in A, yielding a greater contribution of tortuosity and branching to capillary length than in SL. Capillary-to-fiber surface ratio and fiber mitochondrial volume were both greater in A, but their ratio was similar to SL, indicating a proportional increase in the size of the capillary to fiber interface and fiber mitochondrial volume in A to sustain high levels of aerobic capacity while living at altitude.
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Muscle capillary-per-fiber number is higher for birds at high elevations in both highly aerobic pectoral muscles and less aerobic leg muscles.
“Specifically, muscle capillary-per-fiber number is higher for birds at high elevations in both highly aerobic pectoral muscles and less aerobic leg muscles (Hepple et al., 1998;Mathieu-Costello et al., 1998).”
From The physiology and biomechanics of avian flight at high altitude (2006) · cites this paper as Mathieu-Costello et al., 1998
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- Authors
- Mathieu-Costello, O., Agey, P. J., Wu, L., Szewczak, J. M., & MacMillen, R. E.
- Affiliations
- University of California San Diego (US)
- Corresponding author
- Mathieu-Costello, O.
- ORCID
- Venue
- Respiration Physiology
- Publisher
- Elsevier BV
- Published
- 1998-02
- Volume
- 111
- Issue
- 2
- Pages
- 189-199
- ISSN
- 0034-5687 (ISSN-L)
- OpenAlex
- W2076948141
- Cited by
- 64
- References
- 25
- Citations by year
- 2026: 1 · 2025: 3 · 2024: 2 · 2021: 2 · 2020: 3 · 2019: 4 · 2018: 2 · 2017: 4 · 2016: 1 · 2015: 4 · 2014: 1 · 2013: 1
- FWCI
- 2.67
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Respiration Physiology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Heart, Lung, and Blood Institute (P01HL017731, 5PO1 HL 17731)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › High Altitude and Hypoxia
- Physical Sciences › Environmental Science › Ecology › Physiological and biochemical adaptations
- Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
- Keywords
- flight muscle, altitude, house finch, Carpodacus mexicanus, capillary geometry, capillary-to-fiber ratio, mitochondrial volume, cardiorespiratory fitness, capillary tortuosity, capillary branching
- MeSH terms
- Adaptation, Physiological, Altitude, Animals, Birds, Capillaries, Female, Flight, Animal, Male, Mitochondria, Muscle, Oxygen Consumption, Muscle, Skeletal
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