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- W2043514610 abstract "Digestive processes determine whether the particular diet of a bird is utilized efficiently and whether energetic demands are met. Assimilation efficiency is often used as an index of whether a diet is digested optimally. Studies on the digestive processing of generalist feeders are scarce. Cape White-eyes (Zosterops pallidus) have a diverse diet of fruit, nectar and insects. The nutrient contents of these three diets vary considerably and require quite different digestive processing. This study compared the digestive efficiencies of Cape White-eyes on these three diets by measuring transit times and assimilation efficiency. Cape White-eyes lost body mass significantly when fed fruit, while they maintained and gained body mass on nectar and mealworm diets, respectively. Assimilation efficiency varied significantly between the three diet types (nectar>mealworms>apples). When given a choice of diets, Cape White-eyes selected the diet, which was most efficiently digested and yielded the greatest energetic reward. Diet preference trials further showed that Cape White-eyes regulated daily energy intake. Assimilation efficiency depends on the accessibility of nutritional contents of a diet. Cape White-eyes did not maximize assimilation efficiency. Instead, they adjusted transit time to maximize the rate of energy gain per gram of food in order to maintain energy balance." @default.
- W2043514610 created "2016-06-24" @default.
- W2043514610 creator A5006861790 @default.
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- W2043514610 date "2003-04-01" @default.
- W2043514610 modified "2023-09-27" @default.
- W2043514610 title "Digestive efficiency of a generalist avian feeder, the Cape White-eye (Zosterops pallidus)" @default.
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- W2043514610 doi "https://doi.org/10.1016/s1095-6433(03)00005-9" @default.
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