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metadata.dc.type: | Artigo de Periódico |
Title: | Morphometric partitioning of the respiratory surface area and diffusion capacity of the gills and swim bladder in juvenile Amazonian air-breathing fish, Arapaima gigas |
Other Titles: | Micron |
Authors: | Cruz, André Luis da Fernandes, Marisa Narciso Costa, Oscar Tadeu Ferreira da Perry, Steven Franklin |
metadata.dc.creator: | Cruz, André Luis da Fernandes, Marisa Narciso Costa, Oscar Tadeu Ferreira da Perry, Steven Franklin |
Abstract: | The gills and the respiratory swim bladders of juvenile specimens (mean body mass 100 g) of the basal teleost Arapaima gigas (Cuvier 1829) were evaluated using stereological methods in vertical sections. The surface areas, harmonic mean barrier thicknesses and morphometric diffusing capacities for oxygen and carbon dioxide were estimated. The average respiratory surface area of the swim bladder (2173 cm2 kg−1) exceeded that of the gills (780 cm2 kg−1) by a factor of 2.79. Due to the extremely thin air–blood barrier in the swim bladder (harmonic mean 0.22 μm) and the much thicker water–blood barrier of the gills (9.61 μm), the morphometric diffusing capacity for oxygen and carbon dioxide was 88 times greater in the swim bladder than in the gills. These data clearly indicate the importance of the swim bladder, even in juvenile A. gigas that still engage in aquatic respiration. Because of the much greater diffusion constant of CO2 than O2 in water, the gills also remain important for CO2 release. |
Keywords: | Bimodal respiration Lamellar surface area Water/air–blood barrier thickness Stereology Teleost |
metadata.dc.rights: | Acesso Aberto |
URI: | http://repositorio.ufba.br/ri/handle/ri/16307 |
Issue Date: | 2012 |
Appears in Collections: | Artigo Publicado em Periódico (Biologia) |
Files in This Item:
File | Description | Size | Format | |
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André Luis da Cruz.pdf | 1,99 MB | Adobe PDF | View/Open |
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