| 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 |
| thermal acclimation and seasonal variations of erythrocyte size in the andean mouse phyllotis xanthopygus rupestris. | seasonal hematological adjustments in small mammals may include changes in the number and size of the red cells or changes in other linked blood parameters. the direction and magnitude of these changes vary in different species. we hypothesized that the observed variations of the red cell adjustments could be directly related to the magnitude of the seasonal temperature differential, and predicted that the annual red cell size variation in rodents from environments with marked seasonal changes w ... | 2004 | 15596384 |
| hidden diversity in the andes: comparison of species delimitation methods in montane marsupials. | cryptic genetic diversity is a significant challenge for systematists faced with ever-increasing amounts of dna sequence data. computationally intensive coalescent-based analyses involving multiple unlinked loci are the only currently viable methods by which to assess the extent to which phenotypically similar populations (or metapopulations) are genetically distinct lineages. although coalescent-based approaches have been tested extensively via simulations, few empirical studies have examined t ... | 2014 | 24096147 |