Literaturdatenbank
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McCauley, S. J., & Bjorndal, K. A. (1999). Response to dietary dilution in an omnivorous freshwater turtle: implications for ontogenetic dietary shifts. Physiological and Biochemical Zoology, 72(1), 101–108.
Added by: Admin (14 Aug 2008 22:46:50 UTC) Last edited by: Beate Pfau (04 Apr 2009 10:04:01 UTC) |
| Resource type: Journal Article BibTeX citation key: McCauley1999a View all bibliographic details  |
Categories: General Keywords: Emydidae, Ernährung = nutrition, Schildkröten = turtles + tortoises, Trachemys, Trachemys scripta Creators: Bjorndal, McCauley Collection: Physiological and Biochemical Zoology |
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| Abstract |
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Several species of freshwater turtles in the family Emydidae undergo an ontogenetic dietary shift; as juvenile turtles mature, they change from a primarily carnivorous to a primarily herbivorous diet. It has been hypothesized that this shift results from an unfavourable ratio of gut capacity to metabolic rate that prevents small reptiles from processing adequate volumes of plant material to meet their energetic demands. Effects of dietary dilution on intake were evaluated in two size classes of red-eared sliders (Trachemys scripta elegans) to test whether small reptiles have a lower capacity to compensate for low-quality diets through increased intake than do larger conspecifics. Artificial diets with an inert diluent were offered to two size classes of turtles, and mass-specific intakes of DM, energy and N were calculated. Both small (28.7 plus or minus 4.9 g body mass) and large (1230 plus or minus 94 g) turtles compensated for dietary dilution and maintained constant energy and N intakes on diets with lower energy content than common aquatic plants. Thus, body size did not affect the ability to respond to nutritional dilution, which suggests that processing limitations imposed by small body size do not constrain juveniles from adopting an herbivorous diet.
Added by: Admin Last edited by: Beate Pfau |