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Campo DC | Valor | Idioma |
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dc.contributor.author | Wood, Chris M. | - |
dc.contributor.author | Pelster, Bernd | - |
dc.contributor.author | Giacomin, Marina Mussoi | - |
dc.contributor.author | Sadauskas-Henrique, Helen | - |
dc.contributor.author | Almeida-Val, Vera Maria Fonseca | - |
dc.contributor.author | Val, Adalberto Luis | - |
dc.date.accessioned | 2020-06-15T21:41:28Z | - |
dc.date.available | 2020-06-15T21:41:28Z | - |
dc.date.issued | 2016 | - |
dc.identifier.uri | https://repositorio.inpa.gov.br/handle/1/17338 | - |
dc.description.abstract | The evolutionary transition from water-breathing to air-breathing involved not only a change in function of the organs of respiratory gas exchange and N-waste excretion, but also in the organs of ion uptake from the environment. A combination of in vivo and in vitro techniques was used to look at the relative importance of the gills versus the gut in Na+, Cl−, and K+ balance in two closely related erythrinid species: a facultative air-breather, the jeju (Hoplerythrinus unitaeniatus) and an obligate water-breather, the traira (Hopliasmalabaricus). The jeju has a well-vascularized physostomous swimbladder, while that in the traira is poorly vascularized, but the gills are much larger. Both species are native to the Amazon and are common in the ion-poor, acidic blackwaters of the Rio Negro. Under fasting conditions, the traira was able to maintain positive net Na+ and Cl− balance in this water, and only slightly negative net K+ balance. However, the jeju was in negative net balance for all three ions and had lower plasma Na+ and Cl− concentrations, despite exhibiting higher branchial Na+,K+ATPase and v-type H+ATPase activities. In the intestine, activities of these same enzymes were also higher in the jeju, and in vitro measurements of net area-specific rates of Na+, Cl−, and K+ absorption, as well as the overall intestinal absorption capacities for these three ions, were far greater than in the traira. When acutely exposed to disturbances in water O2 levels (severe hypoxia ~15 % or hyperoxia ~420 % saturation), gill ionoregulation was greatly perturbed in the traira but less affected in the jeju, which could “escape” the stressor by voluntarily air-breathing. We suggest that a shift of ionoregulatory capacity from the gills to the gut may have occurred in the evolutionary transition to air-breathing in jeju, and in consequence branchial ionoregulation, while less powerful, is also less impacted by variations in water O2 levels. © 2016, Springer-Verlag Berlin Heidelberg. | en |
dc.language.iso | en | pt_BR |
dc.relation.ispartof | Volume 186, Número 4, Pags. 431-445 | pt_BR |
dc.rights | Restrito | * |
dc.subject | Adenosine Triphosphatase (potassium Sodium) | en |
dc.subject | Air | en |
dc.subject | Chloride | en |
dc.subject | Ion | en |
dc.subject | Potassium | en |
dc.subject | Sodium | en |
dc.subject | Animals | en |
dc.subject | Blood | en |
dc.subject | Characiformes | en |
dc.subject | Gill | en |
dc.subject | Hypoxia | en |
dc.subject | Intestines | en |
dc.subject | Intestine Absorption | en |
dc.subject | Metabolism | en |
dc.subject | Physiology | en |
dc.subject | Respiratory Function | en |
dc.subject | Species Difference | en |
dc.subject | Air | en |
dc.subject | Animal | en |
dc.subject | Characiformes | en |
dc.subject | Chlorides | en |
dc.subject | Gills | en |
dc.subject | Hypoxia | en |
dc.subject | Intestinal Absorption | en |
dc.subject | Intestines | en |
dc.subject | Ions | en |
dc.subject | Potassium | en |
dc.subject | Respiratory Physiological Phenomena | en |
dc.subject | Sodium | en |
dc.subject | Sodium-potassium-exchanging Atpase | en |
dc.subject | Species Specificity | en |
dc.title | The transition from water-breathing to air-breathing is associated with a shift in ion uptake from gills to gut: a study of two closely related erythrinid teleosts, Hoplerythrinus unitaeniatus and Hoplias malabaricus | en |
dc.type | Artigo | pt_BR |
dc.identifier.doi | 10.1007/s00360-016-0965-5 | - |
dc.publisher.journal | Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology | pt_BR |
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