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About the Cover
Cover: The annual killifish Austrofundulus limnaeus inhabits rainwater pools in coastal deserts and savannas in Venezuela. These fish survive the seasonal drying of their habitat as diapausing embryos that are incredibly resistant to a variety of environmental stresses, including long-term anoxia (see article by J. E. Podrabsky et al. on pp. 2253−2266). Despite consisting of largely neural tissues and containing a functional heart, both of which are typically very sensitive to anoxia in vertebrates, these embryos can survive for several months without oxygen and are the most anoxia-tolerant vertebrates yet described. Photo: J. E. Podrabsky.
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