2 documents found, page 1 of 1
Regulation of gill transcellular permeability and renal function during acute h...
Wood, Chris M.; Iftikar, Fathima I.; Scott, Graham R.; Boeck, Gudrun de; Sloman, Katherine A.; Matey, Victoria E.; Domingos, Fabíola Xochilt ValdezEarlier studies demonstrated that oscars, endemic to ion-poor Amazonian waters, are extremely hypoxia tolerant, and exhibit a marked reduction in active unidirectional Na+ uptake rate (measured directly) but unchanged net Na+ balance during acute exposure to low Po2, indicating a comparable reduction in whole body Na+ efflux rate. However, branchial O2 transfer factor does not fall. The present study focused on...
Interactions between hypoxia tolerance and food deprivation in Amazonian oscars...
Boeck, Gudrun de; Wood, Chris M.; Iftikar, Fathima I.; Matey, Victoria E.; Scott, Graham R.; Sloman, Katherine A.; Nazar Paula da Silva, Maria deOscars are often subjected to a combination of low levels of oxygen and fasting during nest-guarding on Amazonian floodplains. We questioned whether this anorexia would aggravate the osmo-respiratory compromise. We compared fed and fasted oscars (1014 days) in both normoxia and hypoxia (1020 Torr, 4 h). Routine oxygen consumption rates (MO2) were increased by 75% in fasted fish, reflecting behavioural differenc...