| nutritional ecophysiology of the andean mouse abrothrix andinus: energy requirements, food quality and turnover time. | 1. abrothrix andinus (rodentia: cricetidae) is a small winter active mammal inhabiting the andes range, enduring seasonal changes in food quality and ambient temperatures. 2. this species responds to seasonal changes in food quality and energy need by seasonal changes in nutrient transport by the small intestine. 3. here i document significant increased digestive turnover time of individuals maintained under low food quality and high energy needs (anova, p < 0.001). 4. contrary to predictions, m ... | 1993 | 8097155 |
| seasonal changes of blood values in the andean mouse abrothrix andinus. | 1. biomonthly measurements of hematological indices were conducted in freshly captured abrothrix andinus (rodentia:cricetidae) over a period of one year. 2. all blood values were in the same range for adult males and females, but juveniles showed lower red blood cell counts (rbc) and erythrocytes of larger size. 3. high rbc numbers, a slight but significant increase of blood hemoglobin concentration (hb), and a significant decrease in mean cell volume (mcv) were found during the winter months. 4 ... | 1993 | 8099866 |
| functional and structural optimization of the respiratory system of the bat tadarida brasiliensis (chiroptera, molossidae): does airway geometry matter? | we studied structure and function of the respiratory system in the bat tadarida brasiliensis and compared it with those of two species of rodents, abrothrix andinus and a. olivaceus. tadarida brasiliensis had lower resting oxygen consumption, but higher maximum oxygen consumption and aerobic scope, than the rodents. the blood-gas barrier of the bat was thinner and its relative lung size was larger; however, alveolar surface density was similar among the three species. in consequence, t. brasilie ... | 2005 | 16215224 |