Effect of hypoxia and body size on the energy metabolism of lungless tadpoles,Bufo woodhousei, and air-breathing anuran larvae
✍ Scribed by Feder, Martin E.
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- English
- Weight
- 1020 KB
- Volume
- 228
- Category
- Article
- ISSN
- 0022-104X
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✦ Synopsis
Unlike most anuran larvae, tadpoles ofBufo woodhousei (toads? lack lungs. To investigate the consequences of lunglessness and its interaction with the body size of larvae, resting and active tadpoles were exposed to hypoxia. In resting larvae, rates of 0, consumption (Vo,) were proportional to aquatic Po2, even though larvae increased buccopharyngeal ventilation considerably in hypoxia. Whole body lactate .concentrations increased only in severe hypoxia. Hypoxia also depressed the Vo, of active larvae, which accumulated lactate even in normoxic water. Air-and water-breathing tadpoles (Rana berlandieri and Xenopus laeuis) can maintain greater routine Vo, in hypoxia than can Bufo tadpoles. However, Bufo tadpoles can extract more 0, from hypoxic water than can Rana and Xenopus tadpoles, when all are breathing only water.