The contribution of air breathing to aerobic scope and exercise performance in the banded knifefish Gymnotus carapo L.
dc.contributor.author | McKenzie, David J. [UNESP] | |
dc.contributor.author | Steffensen, John F. | |
dc.contributor.author | Taylor, Edwin W. [UNESP] | |
dc.contributor.author | Abe, Augusto Shinya [UNESP] | |
dc.contributor.institution | Universidade Estadual Paulista (Unesp) | |
dc.contributor.institution | Univ Montpellier 2 | |
dc.contributor.institution | Univ Copenhagen | |
dc.contributor.institution | Univ Birmingham | |
dc.date.accessioned | 2014-05-20T13:59:57Z | |
dc.date.available | 2014-05-20T13:59:57Z | |
dc.date.issued | 2012-04-01 | |
dc.description.abstract | The contribution of air breathing to aerobic metabolic scope and exercise performance was investigated in a teleost with bimodal respiration, the banded knifefish, submitted to a critical swimming speed (U-crit) protocol at 30 degrees C. Seven individuals (mean +/- s.e.m. mass 89 +/- 7. g, total length 230 +/- 4. mm) achieved a U-crit of 2.1 +/- 1. body. lengths. (BL). s(-1) and an active metabolic rate (AMR) of 350 +/- 21. mg. kg(-1). h(-1), with 38 +/- 6% derived from air breathing. All of the knifefish exhibited a significant increase in air-breathing frequency (f(AB)) with swimming speed. If denied access to air in normoxia, these individuals achieved a U-crit of 2.0 +/- 0.2. BL. s(-1) and an AMR of 368 +/- 24. mg. kg(-1). h(-1) by gill ventilation alone. In normoxia, therefore, the contribution of air breathing to scope and exercise was entirely facultative. In aquatic hypoxia (P-O2=4. kPa) with access to normoxic air, the knifefish achieved a U-crit of 2.0 +/- 0.1. BL. s(-1) and an AMR of 338 +/- 29. mg. kg(-1). h(-1), similar to aquatic normoxia, but with 55 +/- 5% of AMR derived from air breathing. Indeed, f(AB) was higher than in normoxia at all swimming speeds, with a profound exponential increase during exercise. If the knifefish were denied access to air in hypoxia, U-crit declined to 1.2 +/- 0.1. BL. s(-1) and AMR declined to 199 +/- 29. mg. kg(-1). h(-1). Therefore, air breathing allowed the knifefish to avoid limitations to aerobic scope and exercise performance in aquatic hypoxia. | en |
dc.description.affiliation | Univ Estadual Paulista, Dept Zool, Inst Biociencias, BR-13506900 Rio Claro, SP, Brazil | |
dc.description.affiliation | Univ Montpellier 2, UMR Ecol Syst Marins Cotiers 5119, F-34095 Montpellier 5, France | |
dc.description.affiliation | Univ Copenhagen, Marine Biol Lab, Inst Biol, DK-3000 Helsingor, Denmark | |
dc.description.affiliation | Univ Birmingham, Sch Biosci, Birmingham B15 2TT, W Midlands, England | |
dc.description.affiliationUnesp | Univ Estadual Paulista, Dept Zool, Inst Biociencias, BR-13506900 Rio Claro, SP, Brazil | |
dc.description.sponsorship | Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) | |
dc.format.extent | 1323-1330 | |
dc.identifier | http://dx.doi.org/10.1242/jeb.064543 | |
dc.identifier.citation | Journal of Experimental Biology. Cambridge: Company of Biologists Ltd, v. 215, n. 8, p. 1323-1330, 2012. | |
dc.identifier.doi | 10.1242/jeb.064543 | |
dc.identifier.issn | 0022-0949 | |
dc.identifier.lattes | 8776757457144680 | |
dc.identifier.uri | http://hdl.handle.net/11449/21200 | |
dc.identifier.wos | WOS:000302117300014 | |
dc.language.iso | eng | |
dc.publisher | Company of Biologists Ltd | |
dc.relation.ispartof | Journal of Experimental Biology | |
dc.relation.ispartofjcr | 3.179 | |
dc.relation.ispartofsjr | 1,611 | |
dc.rights.accessRights | Acesso restrito | |
dc.source | Web of Science | |
dc.subject | critical swimming speed | en |
dc.subject | hypoxia | en |
dc.subject | metabolic rate | en |
dc.subject | oxygen uptake | en |
dc.subject | respirometry | en |
dc.title | The contribution of air breathing to aerobic scope and exercise performance in the banded knifefish Gymnotus carapo L. | en |
dc.type | Artigo | |
dcterms.license | http://www.biologists.com/copyright_permissions.html | |
dcterms.rightsHolder | Company of Biologists Ltd | |
unesp.author.lattes | 8776757457144680[4] | |
unesp.author.orcid | 0000-0002-6765-8726[4] | |
unesp.campus | Universidade Estadual Paulista (Unesp), Instituto de Biociências, Rio Claro | pt |
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