Episode
The sparkling deep
- Podcast
- Many Minds
- Published
- Jun 20, 2026
- Duration seconds
- 4828
- Processing state
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- https://manyminds.libsyn.com/the-sparkling-deep
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Summary
It's tempting to see bioluminescence as an oddity, one of those rare eccentricities of life on earth. And, on land, maybe that's true. But our planet is mostly water, and out in the open ocean bioluminescence is utterly commonplace. Creatures of all shapes and sorts sparkle and glow, glitter and pulse. But what are these displays for? Why did they evolve? How did light become the currency of the deep? My guest today is Dr. Sönke Johnsen . Sönke is a Distinguished Professor of Biology at Duke University, where he and his research group study the visual ecology of the ocean. He's the author of a number of books: most recently Into the Great Wide Ocean , about life in the pelagic realm, and The Radiant Sea , a photographic tour of bioluminescence and color, written in collaboration with Dr. Steven Haddock. Here, Sönke and I talk about the open ocean: the most common habitat on our planet, yet one that many people will never experience. We consider the curious distribution of bioluminescence— rare on land, exceptionally prevalent in the ocean, and all but absent in freshwater. We talk about how bioluminescence seems to have evolved—many, many times over in fact. We survey the functions of making light in the deep—from counter-illumination to courtship to revenge. Finally, we consider what Sönke takes to be the biggest remaining puzzle about bioluminescence at sea. Alright friends, if you're enjoying Many Minds , we ask (humbly) if you would think about rating us, reviewing us, leaving us a comment, boosting us on social media, or perhaps haranguing your friends—relentlessly—until they give us a listen. Without further ado, onto my conversation with Dr. Sönke Johnsen. Enjoy! Notes 3:30 – The scientific report by Dr. Johnsen and colleagues describing the bioluminescent octop…