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Cover Image
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Cover: Oxygen levels inside the terrestrial eggs of red-eyed treefrogs (Agalychnis callidryas) vary with surface exposure but poorly exposed, hypoxic eggs develop synchronously with their better exposed clutchmates. J. R. Rogge and K. M. Warkentin (pp. 3627-3635) show that the embryonic external gills contribute substantially to oxygen uptake, and that embryos behaviorally position their gills in the best-oxygenated part of the egg, near the air. Exploiting this spatial refuge from hypoxia within the egg allows extended embryonic development of hatching-competent embryos, improving their ability to escape from aquatic predators after hatching. Photograph by Karen M. Warkentin.Close Modal - PDF Icon PDF LinkTable of contents
In the field: an interview with Sönke Johnsen
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Sönke Johnsen is a Professor at Duke University, USA, investigating visual ecology and he talks about his experiences of collecting transparent animals while blue water diving and in a submersible, as well as outrunning Hurricane Katrina.
Call for new preLighters
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preLights is the preprint highlighting community supported by The Company of Biologists. At the heart of preLights are our preLighters: early-career researchers who select and write about interesting new preprints for the research community. We are currently looking for new preLighters to join our team. Find out more and apply here.
Graham Scott in conversation with Big Biology
Graham Scott talks to Big Biology about the oxygen cascade in mice living on mountaintops, extreme environments for such small organisms. In this JEB-sponsored episode, they discuss the concept of symmorphosis and the evolution of the oxygen cascade.
Trap-jaw ants coordinate tendon and exoskeleton for perfect mandible arc
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Trap-jaw ants run the risk of tearing themselves apart when they fire off their mandibles, but Greg Sutton & co have discovered that the ants simultaneously push and pull the mandibles using energy stored in a head tendon and their exoskeleton to drive the jaws in a perfect arc.
Hearing without a tympanic ear
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In their Review, Grace Capshaw, Jakob Christensen-Dalsgaard and Catherine Carr explore the mechanisms of hearing in extant atympanate vertebrates and the implications for the early evolution of tympanate hearing.
