| Packard, M. J., & Packard, G. C. (1986). Effect of water balance on growth and calcium mobilization of embryonic painted turtles (chrysemys picta). Physiological zoology, 59, 398–405. |
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| Packard, G. C., Packard, M. J., & Birchard, G. F. (2000). Availability of water affects organ growth in prenatal and neonatal snapping turtles (chelydra serpentina). Journal of Comparative Physiology B. Biochemical, Systems, and Environmental Physiology, 170(1), 69–74. |
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| Added by: Admin 17 Aug 2008 18:17:24 UTC |
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| Packard, M. J., & Packard, G. C. (1979). Structure of the shell and tertiary membranes of eggs of softshell turtles (trionyx spiniferus). Journal of Morphology, 159, 131–144. |
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| Packard, G. C., Packard, M. J., Lang, J. W., & Tucker, J. K. (1999). Tolerance for freezing in hatchling turtles. Journal of Herpetology, 33(4), 536–543. |
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| Added by: Admin 17 Aug 2008 18:54:55 UTC |
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| Packard, G. C., Packard, M. J., & McDaniel, L. L. (2001). Seasonal change in the capacity for supercooling by neonatal painted turtles. Journal of Experimental Biology, 204(9), 1667–1672. |
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| Packard, G. C., & Packard, M. J. (1988). The physiological ecology of reptilian eggs and embryos. In C. G. A. S. Gans & R. B. Huey (Eds.), Biology of the Reptilia 16 (pp. 523–605).New York. |
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| Added by: Sarina Wunderlich 13 Oct 2008 21:33:01 UTC |
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| Packard, G. C., & Packard, M. J. (1993). Sources of variation in laboratory measurements of water relations of reptilian eggs and embryos. Physiological zoology, 66 (1), 115–127. |
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| Added by: Sarina Wunderlich 23 Aug 2008 14:56:32 UTC |
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| Packard, G. C., Packard, M. J., McDaniel, P. L., & McDaniel, L. L. (1989). Tolerance of hatchling painted turtles to subzero temperatures. Canadian Journal of Zoology, 67, 828–830. |
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| Added by: Sarina Wunderlich 13 Oct 2008 21:33:01 UTC |
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| Packard, G. C., & Packard, M. J. (1990). Patterns of survival at subzero temperatures by hatchling painted turtles and snapping turtles. Journal of Experimental Zoology, 254, 233–236. |
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| Added by: Sarina Wunderlich 13 Oct 2008 21:33:02 UTC |
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| Packard, G. C., Packard, M. J., & Boardman, T. J. (1981). Patterns and possible significance of water exchange by flexible-shelled eggs of painted turtles (chrysemys picta). Physiological zoology, 54, 165–178. |
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| Added by: Admin 24 Aug 2008 19:37:46 UTC |
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| Packard, M. J., Packard, G. C., & Boardman, T. J. (1982). Structure of eggshells and water relations of reptilian eggs. Herpetologica, 38, 136–155. |
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| Added by: Admin 24 Aug 2008 19:37:47 UTC |
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| Packard, G. C., Packard, M. J., & Boardman, T. J. (1984). Effects of the hydric environment on metabolism of embryonic snapping turtles do not result from altered patterns of sexual differentiation. Copeia, 1984, 547–550. |
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| Added by: Admin 24 Aug 2008 19:37:47 UTC |
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| Packard, G. C., & Packard, M. J. (2003). Natural freeze-tolerance in hatchling painted turtles? Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 134(2), 233–246. |
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| Added by: Admin 14 Aug 2008 20:35:31 UTC |
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| Packard, M. J., Short, T. M., Packard, G. C., & Gorell, T. A. (1984). Sources of calcium for embryonic development in eggs of the snapping turtle chelydra serpentina. Journal of Experimental Zoology, 230, 81–87. |
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| Added by: Admin 24 Aug 2008 19:37:48 UTC |
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| Packard, G. C., & Packard, M. J. (2003). Influence of acclimation and incubation medium on supercooling by hatchling painted turtles, chrysemys picta. Functional Ecology, 17(5), 611–618. |
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| Added by: Admin 14 Aug 2008 20:36:26 UTC |
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| Packard, G. C., Miller, K., Packard, M. J., & Birchard, G. F. (1999). Environmentally induced variation in body size and condition in hatchling snapping turtles (chelydra serpentina). Canadian Journal of Zoology, 77(2), 278–289. |
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| Added by: Admin 17 Aug 2008 18:17:24 UTC |
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| Packard, G. C., & Packard, M. J. (2000). Developmental plasticity in painted turtles, chrysemys picta. Functional Ecology, 14(4), 474. |
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| Added by: Admin 17 Aug 2008 18:54:55 UTC |
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| Packard, G. C., & Packard, M. J. (2001). The overwintering strategy of hatchling painted turtles, or how to survive in the cold without freezing. Bioscience, 51(3), 199–207. |
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| Added by: Admin 17 Aug 2008 18:54:55 UTC |
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| Packard, G. C., & Packard, M. J. (1988). Water relations of embryonic snapping turtles (chelydra serpentina) exposed to wet or dry environments at different times in incubation. Physiological zoology, 61, 95–106. |
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| Added by: Sarina Wunderlich 13 Oct 2008 21:33:01 UTC |
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| Packard, G. C., & Packard, M. J. (1995). A review of the adaptive strategy used by hatchling painted turtles to survive in the cold. Herpetological Review, 26(8), 10–12. |
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| Added by: Admin 23 Aug 2008 15:33:07 UTC |
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