Sodium and potassium balance of captive meadow voles (Microtus pennsylvanicus) fed laboratory chow and vegetation diets |
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| Institution: | 1. Panthera, 8 West 40th St, New York, NY, 10018, USA;2. Institute for Communities and Wildlife in Africa, Department of Biological Sciences, University of Cape Town, Private Bag X3, Rondebosch, Cape Town, 7701, South Africa;3. Centre for Social Science Research, University of Cape Town, Private Bag X3, Rondebosch, Cape Town, 7701, South Africa;4. Independent Researcher, P.O. Box 190, Muscat, 100, Oman;5. National Centre for Wildlife, Riyadh, Saudi Arabia;6. Royal Commission for AlUla, Al Safarat, Riyadh, 12512, Saudi Arabia;1. Instituto de Diversidad y Ecología Animal, Universidad Nacional de Córdoba (IDEA-CONICET-UNC), X5000JJC Córdoba, Argentina;2. Instituto Multidisciplinario de Biología Vegetal, Universidad Nacional de Córdoba (IMBIV-CONICET-UNC), CC 495, X5000JJC Córdoba, Argentina;3. Museo de Zoología, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, X5000JJC Córdoba, Argentina;1. Posgrado en Ciencias Biológicas, UNAM, Mexico;2. Departamento de Ecología de la Biodiversidad, Laboratorio de Genética y Ecología, Instituto de Ecología, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, Mexico City, 04510, Mexico;3. Instituto de Ecología, Unidad Hermosillo, Universidad Nacional Autónoma de México, Hermosillo, Sonora, Mexico |
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| Abstract: | - 1.1. Mineral balance was studied in meadow voles (Microtus pennsylvanicus) maintained in the laboratory.
- 2.2. Urine and fecal Na+ contents of voles on low-Na+ diets were comparable to those reported for other herbivore species, but urine and fecal K levels were higher.
- 3.3. Voles approached Na+ balance (input = output) on diets with Na+ content as low as 56 ppm.
- 4.4. There was not a clearcut hypertrophy of the adrenal-gland zona glomerulosa in voles maintained on low-Na+ diets.
- 5.5. Plasma K content and bone water content were higher in voles maintained on high-Na + vegetation diets, suggesting expansion of extracellular fluid volume.
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