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Titolo:
Ventilation, gill perfusion and blood gases in dourado, Salminus maxillosus Valenciennes (Teleostei, Characidae), exposed to graded hypoxia
Autore:
Souza, RHD; Soncini, R; Glass, ML; Sanches, JR; Rantin, FT;
Indirizzi:
Univ Fed Sao Carlos, Dept Physiol Sci, BR-13565905 Sao Carlos, SP, Brazil Univ Fed Sao Carlos Sao Carlos SP Brazil BR-13565905 BCCarlos, SP, Brazil Brazialian Inst Environm Management CEPTA IBAMA, Ctr Res Trop Fish, Pirassununga, SP, Brazil Brazialian Inst Environm Management CEPTA IBAMA Pirassununga SP Brazil l USP, Fac Med Ribeirao Preto, Dept Physiol, Ribeirao Preto, SP, Brazil USPRibeirao Preto SP Brazil o, Dept Physiol, Ribeirao Preto, SP, Brazil
Titolo Testata:
JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMIC AND ENVIRONMENTALPHYSIOLOGY
fascicolo: 6, volume: 171, anno: 2001,
pagine: 483 - 489
SICI:
0174-1578(200108)171:6<483:VGPABG>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
TROUT SALMO-GAIRDNERI; CYPRINUS-CARPIO L; RAINBOW-TROUT; HOPLIAS-MALABARICUS; RESPONSES; TEMPERATURE; FISH; HYPERCAPNIA; LACERDAE; REFLEXES;
Keywords:
ventilation; gill perfusion; blood gases; oxygen uptake; dourado, Salminus maxillosus;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Rantin, FT Univ Fed Sao Carlos, Dept Physiol Sci, BR-13565905 Sao Carlos, SP, Brazil Univ Fed Sao Carlos Sao Carlos SP Brazil BR-13565905 BC Brazil
Citazione:
R.H.D. Souza et al., "Ventilation, gill perfusion and blood gases in dourado, Salminus maxillosus Valenciennes (Teleostei, Characidae), exposed to graded hypoxia", J COMP PH B, 171(6), 2001, pp. 483-489

Abstract

The dourado, Salminus maxillosus, is an active and migratory teleost foundin lotic waters of Southern Brazil. We have studied the relationships of gas transport in dourado to the specific ecophysiology of this-species. Measurements were performed of blood gases, O-2 uptake, gill ventilation and perfusion at normoxia and various levels of hypoxia. Thus, the study aimed ata detailed assessment of the causes Of O-2 transport failure, using recentmodels for gas transport in vertebrates. Oxygen uptake was maintained downto a critical water partial O-2 pressure of 42 mmHg, below which it markedly decreased. This could be explained based on ventilatory and cardiovascular responses: Ventilation increased sufficiently to match decreases of water O-2 partial pressure during moderate hypoxia (partial pressure Of O-2 > 42 mmHg) but failed to meet O-2 demands below this value. Likewise, the cardiovascular responses were insufficient to maintain an adequate transport below moderatelevels of hypoxia. Thus, combined failure of ventilation and blood gas transport account for the abrupt decreases Of O-2 transport. The species proved highly vulnerable to hypoxia, which is consistent with the normally well-aerated habitat and the active mode of life of the species.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 23:39:38