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Passerines versus nonpasserines: so far, no statistical differences in the scaling of avian energetics.
We analyzed and compared the scaling of both basal and maximal thermogenic metabolic rates in passerine and nonpasserine birds using conventional and phylogenetic methods. In spite of the presumed…
Dietary Flexibility and Intestinal Plasticity in Birds: A Field and Laboratory Study
Doubts are cast on the notion that dietary flexibility and the plasticity of the gut's enzymes are necessarily correlated and on the general validity of the adaptive modulation hypothesis after the first field documentation of modulation of intestinal enzymes by diet in birds.
HEMATOLOGICAL PARAMETERS AND STRESS INDEX IN RUFOUS-COLLARED SPARROWS DWELLING IN URBAN ENVIRONMENTS
It is found that urban Rufous-collared Sparrows have lower body weight, higher blood glucose concentration, higher proportion of heterophils (H), lower proportion of lymphocytes (L), and consequently, a larger H:L stress index, than rural ones.
Seasonal Changes in Energy Expenditure and Digestive Tract of Abrothrix andinus (Cricetidae) in the Andes Range
- F. Bozinovic, F. Novoa, C. Veloso
- Biology, Environmental SciencePhysiological Zoology
- 1 November 1990
The South American field mouse Abrothrix andinus (Rodentia: Cricetidae) is a small mammal active throughout the year in the Andes, despite substantial seasonal environmental changes. Body mass…
Feeding and digesting fiber and tannins by an herbivorous rodent, Octodon degus (Rodentia:Caviomorpha).
Seasonal changes in diet, digestive morphology and digestive efficiency in the rufous-collared sparrow (Zonotrichia Capensis) in Central Chile
When nutritional demands increase during winter, birds may respond to the seasonal environment through behavioral, anatomical and physiological changes that allow the maintenance of a positive energy budget and consequently permit survival.
Modulating factors of the energetic effectiveness of huddling in small mammals
The effects of ambient temperature, thermal conductance and ontogeny on the huddling effectiveness in white mice Mus musculus and the Sigmodontine Abrothrix andinus as a model organism are analyzed.
Metabolic Costs of Rodents Feeding on Plant Chemical Defenses: A Comparison Between an Herbivore and an Omnivore
La entomofauna de las dunas de la playa de Barra (Cangas-Pontevedra). III. Coleóptera
The eniomological fauna of ihe Barra beach dunes (Cangas-Pontevedra) is studied and a check-list of Coleoptera captured in the dunes of Barra is given.