Use este identificador para citar ou linkar para este item: https://repositorio.inpa.gov.br/handle/1/15051
Título: Transition in organ function during the evolution of air-breathing; insights from Arapaima gigas, an obligate air-breathing teleost from the Amazon
Autor: Brauner, Colin John
Matey, Victoria E.
Wilson, Jonathan
Bernier, Nicholas J.
Val, Adalberto Luis
Palavras-chave: Adenosine Triphosphatase (potassium Sodium)
Animals
Breathing
Comparative Study
Cytology
Evolution
Fish
Gill
Histology
Immunohistochemistry
Kidney
Mitochondrion
Physiology
Review
Microscopy, Electron, Scanning
Ultrastructure
Animal
Evolution
Fishes
Gills
Immunohistochemistry
Kidney
Microscopy, Electron, Scanning
Mitochondria
Na(+)-k(+)-exchanging Atpase
Respiration
Animalsia
Arapaima Gigas
Osteoglossum
Osteoglossum Bicirrhosum
Pisces
Teleostei
Data do documento: 2004
Revista: Journal of Experimental Biology
É parte de: Volume 207, Número 9, Pags. 1433-1438
Abstract: The transition from aquatic to aerial respiration is associated with dramatic physiological changes in relation to gas exchange, ion regulation, acid-base balance and nitrogenous waste excretion. Arapaima gigas is one of the most obligate extant air-breathing fishes, representing a remarkable model system to investigate (1) how the transition from aquatic to aerial respiration affects gill design and (2) the relocation of physiological processes from the gills to the kidney during the evolution of air-breathing. Arapaima gigas undergoes a transition from water- to air-breathing during development, resulting in striking changes in gill morphology. In small fish (10 g), the gills are qualitatively similar in appearance to another closely related water-breathing fish (Osteoglossum bicirrhosum); however, as fish grow (100-1000 g), the inter-lamellar spaces become filled with cells, including mitochondria-rich (MR) cells, leaving only column-shaped filaments. At this stage, there is a high density of MR cells and strong immunolocalization of Na+/K+-ATPase along the outer cell layer of the gill filament. Despite the greatly reduced overall gill surface area, which is typical of obligate air-breathing fish, the gills may remain an important site for ionoregulation and acid-base regulation. The kidney is greatly enlarged in A. gigas relative to that in O. bicirrhosum and may comprise a significant pathway for nitrogenous waste excretion. Quantification of the physiological role of the gill and the kidney in A. gigas during development and in adults will yield important insights into developmental physiology and the evolution of air-breathing.
DOI: 10.1242/jeb.00887
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