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https://hdl.handle.net/2440/44142
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DC Field | Value | Language |
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dc.contributor.author | Seymour, R. | - |
dc.contributor.author | Farrell, A. | - |
dc.contributor.author | Christian, K. | - |
dc.contributor.author | Clark, T. | - |
dc.contributor.author | Bennett, M. | - |
dc.contributor.author | Wells, R. | - |
dc.contributor.author | Baldwin, J. | - |
dc.date.issued | 2007 | - |
dc.identifier.citation | Journal of Comparative Physiology B: biochemical, systemic, and environmental physiology, 2007; 177(5):579-587 | - |
dc.identifier.issn | 0174-1578 | - |
dc.identifier.issn | 1432-136X | - |
dc.identifier.uri | http://hdl.handle.net/2440/44142 | - |
dc.description | The original publication can be found at www.springerlink.com | - |
dc.description.abstract | The Pacific tarpon is an elopomorph teleost fish with an air-breathing organ (ABO) derived from a physostomous gas bladder. Oxygen partial pressure (PO(2)) in the ABO was measured on juveniles (238 g) with fiber-optic sensors during exposure to selected aquatic PO(2) and swimming speeds. At slow speed (0.65 BL s(-1)), progressive aquatic hypoxia triggered the first breath at a mean PO(2) of 8.3 kPa. Below this, opercular movements declined sharply and visibly ceased in most fish below 6 kPa. At aquatic PO(2) of 6.1 kPa and swimming slowly, mean air-breathing frequency was 0.73 min(-1), ABO PO(2) was 10.9 kPa, breath volume was 23.8 ml kg(-1), rate of oxygen uptake from the ABO was 1.19 ml kg(-1) min(-1), and oxygen uptake per breath was 2.32 ml kg(-1). At the fastest experimental speed (2.4 BL s(-1)) at 6.1 kPa, ABO oxygen uptake increased to about 1.90 ml kg(-1) min(-1), through a variable combination of breathing frequency and oxygen uptake per breath. In normoxic water, tarpon rarely breathed air and apparently closed down ABO perfusion, indicated by a drop in ABO oxygen uptake rate to about 1% of that in hypoxic water. This occurred at a wide range of ABO PO(2) (1.7-26.4 kPa), suggesting that oxygen level in the ABO was not regulated by intrinsic receptors. | - |
dc.description.statementofresponsibility | Roger S. Seymour, Anthony P. Farrell, Keith Christian, Timothy D. Clark, Michael B. Bennett, Rufus M. G. Wells and John Baldwin | - |
dc.language.iso | en | - |
dc.publisher | Springer | - |
dc.source.uri | http://www.springerlink.com/content/90239m328x4119nx/ | - |
dc.subject | Fish | - |
dc.subject | Respiration | - |
dc.subject | Air-breathing | - |
dc.subject | Bimodal gas exchange | - |
dc.subject | Oxygen receptors | - |
dc.title | Continuous measurement of oxygen tensions in the air-breathing organ of Pacific tarpon (Megalops cyprinoides) in relation to aquatic hypoxia and exercise | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1007/s00360-007-0156-5 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Seymour, R. [0000-0002-3395-0059] | - |
Appears in Collections: | Aurora harvest Earth and Environmental Sciences publications |
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