Metabolic scaling associated with unusual size changes during larval development of the frog, Pseudis paradoxus

The Journal of Experimental Biology
Silvia Cristina R de Souza, Claudia M Kuribara

Abstract

The early larvae of P. paradoxus grow large but metamorphose into relatively small frogs, the diminished post-metamorphic growth producing a marked contrast between maximum larval size and adult. Thus, O(2) uptake does not appear to limit the energy expenditure on growth processes, and unlike in other anuran larvae, may not be a surface area-related function in P. paradoxus larvae. The resting rates of metabolism (M(O(2))) and partitioning between aquatic (Mw(O(2))) and aerial O(2) uptake (Ma(O(2))) were measured on tadpoles and froglets by closed system respirometry, using water of P(O(2)) ranging from 145 to 40 mmHg. Correlative changes in body glycogen and lactate were examined by standard enzyme assays. Scaling patterns in the growth and degrowth stages were analysed on whole-body, log-transformed data using linear regressions. In normoxia, M(O(2)) was 2.1-2.5 mumol g(-1) h(-1) in the early larvae, increasing more than twofold on forelimb emergence and decreasing sharply in the froglets; M(O(2)) varies in strict proportion to body mass (M(b)), both in the growth (b=1.02) and degrowth (b=0.97) phases, according to the equation M(O(2))=aM(b)(b), where b is the scaling coefficient. Mw(O(2)) constitutes >90% of total uptake in ...Continue Reading

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Citations

Oct 28, 2016·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Sarah A OrlofskeWilliam A Hopkins

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