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First published online September 14, 2007
Journal of Experimental Biology 210, 3415-3421 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.005652
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Rapid assimilation of yolk enhances growth and development of lizard embryos from a cold environment

Melissa A. Storm and Michael J. Angilletta, Jr*

Department of Ecology and Organismal Biology, Indiana State University, Terre Haute, IN 47809, USA


Figure 1
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  		Fig. 1. Embryos from VA developed more rapidly than embryos from SC. After 48 days of incubation, embryos from VA (N=36) and SC (N=36) reached stages 37.4±0.3 and 37.0±0.3, respectively. Yolk manipulation did not affect the development of embryos. Data were adjusted for initial energy by ANCOVA. Error bars represent 95% confidence intervals of means for each treatment.

 

Figure 2
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  		Fig. 2. Embryos from VA grew more rapidly than embryos from SC. Mean investments in growth were 792±76 J and 481±58 J for embryos from VA (N=36) and SC (N=36), respectively. Yolk manipulation did not affect the growth of embryos. Data were adjusted for initial energy by ANCOVA. Error bars represent 95% confidence intervals of means for each treatment.

 

Figure 3
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  		Fig. 3. Embryos from VA assimilated more yolk than embryos from SC. Mean quantities of residual yolk were 2277±126 J and 2628±126 J for embryos from VA (N=36) and SC (N=36), respectively. Yolk manipulation did not affect the assimilation of yolk by embryos. Data were adjusted for initial energy by ANCOVA. Error bars represent 95% confidence intervals of means for each treatment.

 

Figure 4
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  		Fig. 4. Both the total respiration (A) and respiration during day 45 (B) were greater for embryos from VA than they were for embryos from SC. Total respiration was 1291±52 J and 1191±53 J for embryos from VA (N=20) and SC (N=19), respectively. Respiration during day 45 was 1.71±0.13 J h–1 and 1.62±0.13 J h–1 for embryos from VA (N=19) and SC (N=19), respectively. Yolk manipulation did not affect the respiration of embryos. Data were adjusted for embryonic growth or embryonic mass by ANCOVA (see text for details). Error bars represent 95% confidence intervals of means for each treatment.

 




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