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Fig. 4. Time required for red-eyed treefrog embryos to reposition gills or head
near air-exposed egg surface after experimental manipulation turning animals
to face hypoxic rear of egg, and time until the next movement for controls
manipulated similarly but positioned facing air-exposed egg surface. Embryos
were watched until they moved or for 120 s (2 days old) or 60 s (3 days old).
Many control embryos did not move; time watched was used as time to move for
these animals. Data are means ± s.e.m.; N=25 embryos per
treatment per age.
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