Effects of environmental temperature on oxygen diffusion capacity during post-natal development in the altricial rodent, Phyllotis darwini

In this contribution we studied the developmental phenotypic plasticity of respiratory structures involved ill the exchange of gases in all altricial rodent, the leaf-eared mouse (Phyllotis darwini). We studied morphological pulmonary parameters of warm (30 degrees C) and cold acclimated animals 15 degrees C) at different developmental stages. We found that acclimation treatments did not affect neither lung volume, the alveolo-capillary barrier thickness nor the respiratory surface density. In consequence the oxygen diffusion capacity was not affected. Although Phyllotis darwini exhibited structural respiratory changes expected by its ontogenetic development, these Structures were not affected by thermal acclimation during the post-natal development.