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Clutch effects explain heart rate variation in embryonic frogs (cave coqui, Eleutherodactylus cooki)

Burggren, W. and Crossley, D. and Rogowitz, G. and Thompso, D. (2003) Clutch effects explain heart rate variation in embryonic frogs (cave coqui, Eleutherodactylus cooki). Physiological and Biochemical Zoology, 76 (5). pp. 672-678. ISSN 1537-5293

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Publisher’s or external URL: http://dx.doi.org/10.1086/376918

Abstract

Few physiological studies to date have focused on whether variation among sibling groups during development can account for often large, intraspecific physiological variation. In this study, we measured heart rate in the direct-developing frog Eleutherodactylus cooki throughout its embryonic development and examined heart rate variation among egg clutches comprising from 10 to 40 eggs. Clutches were collected in the wild in Yubucoa, Puerto Rico, and individual eggs were maintained under equivalent conditions in the lab. Heart rate showed large increases during development, rising from about 40 beats min(-1) in the earliest stages to about 110 beats min(-1) at hatching. The effect of stage (averaged across clutches) was highly significant (P < 0.001). However, repeated-measures MANOVA also revealed that there were highly significant effects on heart rate associated with both clutch (variation among clutches averaged across development; P < 0.001) and clutch-stage interactions (differences among clutches in the developmental change in heart rate; P < 0.0001). These effects and interactions reveal that throughout development, heart rate in siblings is much more similar than in nonsiblings and that sib groups follow different heart rate trajectories during their development. Collectively, these data indicate that "clutch effects" caused by genetic and/or maternal influences can strongly affect patterns of heart function during development within cave coqui populations. This phenomenon also occurs in bird eggs and armadillo neonates, suggesting that physiological variation attributable to clutch effects might be a widespread phenomenon in vertebrates.

Item Type: Article
Publisher’s Statement: Physiological and Biochemical Zoology 76(5):672–678. 2003. © 2003 by The University of Chicago. All rights reserved.
ID number or DOI: 10.1086/376918
Keywords: Eleutherodactylus cooki; physiological development; sibling effect;
Subjects: Q Science > QL Zoology
Department/Unit: College of Engineering, Forestry, and Natural Science > Biological Sciences
Date Deposited: 11 Feb 2016 21:26
URI: http://openknowledge.nau.edu/id/eprint/1763

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