Comparison of the Oxygen Diffusing Capacity of the Picui Ground Dove Columbina picui with Other Doves of ChileReport as inadecuate




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We studied the respiratory surface density and the thickness of the air-blood barrier in the Picui Ground DoveColumbina picui, and compared it with Eared Dove Zenaida auriculata and Blacked-winged Ground Dove Metropelia melanoptera,two larger species. As expected, Columbina picui BMR and VO2max showed higher values than those of the larger species according tothe expected for their body size. The respiratory surface density and the thickness of the blood-air barrier were not different among thedifferent species of doves. However C. picui showed an anatomical diffusion factor lower than M. melanoptera and Z. auriculata. PicuiGround Dove had low values of oxygen diffusion capacity, such as cursorial birds. A differential oxygen partial pressure of 7.5 Kpa, anusual value at sea level, it can hardly meet their maximal energy requirements and it means that Picui Ground Dove, would have seriouslimitations to live at high altitudes, which is consistent with the observation that this species inhabits lowlands and at the foot hillsof the Andes.Nota general

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Author: Canals Lambarri, Mauricio; - Alfaro, Carmen; - Figueroa Perez, Daniela; - Sabat K., Pablo; - Sallaberry Ayerza, Michel; -

Source: http://repositorio.uchile.cl/



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