Literaturdatenbank
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McMaster, M. K., & Downs, C. T. (2008). Digestive parameters and water turnover of the leopard tortoise. Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 151(1), 114–125.
Added by: Admin (14 Aug 2008 20:39:25 UTC) |
| Resource type: Journal Article BibTeX citation key: McMaster2008 View all bibliographic details  |
Categories: General Keywords: Ernährung = nutrition, Geochelone, Physiologie = physiology, Schildkröten = turtles + tortoises, Stigmochelys, Stigmochelys pardalis, Testudinidae Creators: Downs, McMaster Collection: Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology |
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| Abstract |
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Testudinidae Geochelone Leopard tortoises (Stigmochelys pardalis) experience wide fluctuations in environmental conditions and unpredictable availability of food and water within the Nama-Karoo biome. It was hypothesised that tortoises fed two diets differing in preformed water and fibre content would have differing food intake, gut transit rate, assimilation efficiency, faecal and urinary water loss, and urine concentrations. It was predicted that tortoises fed these contrasting diets would attempt to maintain energy and water balance by altering their digestive parameters. Leopard tortoises fed lucerne (Medicago sativa) had a low food intake coupled with long gut transit times, which resulted in the lowest amount of faecal energy and faecal water lost. Tortoises fed tomatoes (Solanum lycopersicum) had higher food intake and faster gut transit times, but more energy and water was lost in the faeces. However, daily energy assimilated and assimilation efficiency were comparable between tortoises fed the two diets. Urine osmolality was significantly different between tortoises on the two diets. Results indicate that leopard tortoises can adjust parameters such as transit rate, food intake, water loss and urine osmolality to maintain body mass, water and energy balance in response to a high fibre, low water content and a low fibre, high water content diet. This study suggests that this digestive flexibility allows leopard tortoises in the wild to take advantage of unpredictable food and water resources.
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WIF
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