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The Journal of Experimental Biology 204, 3747-3753 (2001)
© 2001 The Company of Biologists Limited

Effects of hypoxia on egg capsule conductance in Ambystoma (Class Amphibia, Order Caudata)

Nathan E. Mills1,*, M. Christopher Barnhart1 and R. D. Semlitsch2

1 Department of Biology, Southwest Missouri State University, Springfield, MO 65804, USA and
2 Division of Biological Sciences, University of Missouri, Columbia, MO 65211, USA

*Present address: 105 Tucker Hall, Division of Biological Sciences, University of Missouri, Columbia, MO 65211, USA (e-mail: nemee9{at}mizzou.edu)

Accepted August 9, 2001

Aquatic amphibian eggs frequently encounter hypoxic conditions that have the potential to limit oxygen uptake and thereby slow embryonic development and hatching. Oxygen limitation might be avoided if egg capsule surface area and oxygen conductance increased in response to hypoxia. We investigated this possibility in two salamander species, Ambystoma annulatum and Ambystoma talpoideum. The effective surface area of egg capsules increased in response to hypoxia, which increased the conductance for oxygen and enhanced oxygen transport. The ability of amphibian eggs to adjust their conductance in response to oxygen availability may increase survival in hypoxic environments.

Key words: salamander, Ambystoma annulatum, Ambystoma talpoideum, hypoxia, egg capsule, conductance, development, survival.




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© The Company of Biologists Ltd 2001