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The Hidden Solar Power Plant Living on Coral Reefs · How To Protect The Ocean

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  When you think of the engines that power a coral reef, you probably picture coral.
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  But scientists have just discovered another animal that has been quietly
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  harvesting sunlight and helping fuel tropical ecosystems all along.
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  To find out what that is, listen to this episode.
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  'Cause this is the How to Protect the Ocean podcast, your
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  weekday ocean news update.
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  If you care about staying informed about the news of the ocean,
• 0:22
  Monday to Friday every weekday, hit that follow button right now so
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  you don't miss next week's story.
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  Today, we're answering one question.
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  How can a simple sea sponge use sunlight, and why does that discovery change
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  the way we think about tropical reefs?
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  That's what we're gonna be talking about today.
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  Coral reefs often get all the attention.
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  Like, they're colorful, they're packed with fish, they have a huge diode of
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  biodiversity, fish, invertebrates, all that kind of stuff, and they're some of
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  the most biodiverse ecosystems on Earth.
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  But reefs are also home to another group of animals that rarely
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  make the headlines, sponges.
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  At a first glance, they don't look particularly exciting.
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  They don't swim.
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  They don't hunt.
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  They don't even have a brain.
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  But new research has revealed that some tropical sponges are
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  doing something remarkable.
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  Thanks to a partnership with microscopic algae living inside their tissues, these
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  sponges can harness sunlight to generate much of the energy they need to survive.
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  And that discovery doesn't just tell us something interesting about sponges.
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  It tells us that we've been underestimating one of the
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  most important players.
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  Because before, like, sponges were sponges.
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  I mean, you have sponges.
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  They come from sponges in the Earth.
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  They hold a lot of water.
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  They have, like, sponges, like the animal sponges in the reefs, or in
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  the tropical waters, when they have this, like, siphon in the middle,
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  and they, like, put out water.
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  They bring in water, they put out water.
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  It's really kind of a cool thing.
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  But you never really know exactly what's happening with these sponges.
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  So let's just start with the basics.
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  Sponges are among the oldest animals on the planet.
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  They've existed for hundreds of millions of years, long before
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  dinosaurs walked the planet.
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  Most people think of them as simple filter feeders.
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  They pump enormous amounts of sea waters through their bodies
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  capturing bacteria, tiny particles, and organic matter for food.
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  And that's true.
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  But for some tropical sponge species, filtering water
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  is only part of their story.
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  Researchers found that certain sponges host microscopic
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  algae inside their tissues.
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  Those algae perform photosynthesis using sunlight to convert carbon
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  dioxide into energy-rich compounds, just like algae that live inside
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  reef-building corals zooxanthellae.
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  But the difference is that scientists now have a much better understanding
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  of how important this relationship is.
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  The algae share a large portion of energy they produce with their sponge host,
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  effectively acting as tiny solar panels embedded throughout the animal's body.
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  That means these sponges aren't relying only on what they filter from the water.
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  They're also being powered by the sun.
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  And it's a partnership that's been evolving for millions of years, and it
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  helps explain why these sponges thrive in nutrient-poor tropical waters where
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  food could be surprisingly scarce.
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  So why should we care about a sponge?
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  Because reefs are built on relationships.
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  When people hear the word photosynthesis, they usually think about plants
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  like trees and land plants.
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  In the ocean, many animals depend on partnerships with microscopic
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  organisms that perform the same job.
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  Corals are a classic example.
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  Without their symbiotic algae, coral reefs as we know them wouldn't exist.
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  Now, scientists are showing that some sponges have developed a similar strategy.
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  That matters because sponges already play several critical roles on reefs.
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  They filter thousands of liters of water.
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  They recycle nutrients.
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  They provide habitats for countless small animals.
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  They help keep reef ecosystems functioning.
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  If some of those sponges are also generating their own energy through
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  sunlight, it changes our understanding of how energy moves through reef ecosystems.
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  It also raises fascinating questions.
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  Could these sponge algae partnerships make certain sponge species more
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  resilient as ocean conditions change?
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  Could they become even more important if coral communities decline?
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  Scientists don't have all the answers yet,
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  but these are exactly the kinds of questions that this research opens up.
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  Another reason this matters is that healthy reefs depend on diversity.
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  We often focus conservation on one iconic species: sea
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  turtles, sharks, corals, whales.
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  But ecosystems are resilient because many different species perform different jobs.
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  Sponges are not to be the stars of reef documentaries.
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  We know that.
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  But they could be some of the hardest working members of the community.
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  This discovery is another reminder that we still have so
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  much to learn about the ocean.
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  Scientists are now investigating how widespread these sun-powered
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  sponge partnerships really are.
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  Do only a handful of species benefit, or is it much more common than we realized?
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  Researchers also want to understand how these partnerships respond to
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  marine heatwaves, ocean warming, and declining water quality.
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  That's especially important because many reefs are already under
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  pressure from climate change.
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  If some sponge species prove more tolerant of warming conditions than
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  corals, they could become increasingly important parts of future reef ecosystems.
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  This doesn't mean sponges replace corals.
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  Nothing replace a healthy coral reef.
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  But understanding every piece of the ecosystem helps us make
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  better conservation decisions.
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  One of the biggest lessons from marine science over the past
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  decade is that ecosystems are often more connected than we imagine.
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  The animals we overlook today may turn out to be essential tomorrow,
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  just like sponges were in the reefs.
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  And that's exactly why research like this matters.
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  Every new discovery fills another piece of the puzzle.
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  The more we understand how reefs actually work, the better
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  equipped we'll be to protect them.
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  Coral reefs aren't powered by coral alone.
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  We've discovered that.
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  They're powered by partnerships.
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  This new research reminds us that even one of the ocean's simplest animals,
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  sponges, can reveal a surprisingly sophisticated strategy for surviving,
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  thriving, and supporting one of the most important ecosystems on the planet.
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  That's it for today's episode, and that's it for this week.
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  I would love to hear your thoughts on these sponges, these new, like,
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  partnerships that are happening with algae, and to find out,
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  like, what that means to you for the future of coral reefs.
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  Are we gonna see a change?
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  We're already starting to see research come out, it has been coming out for a
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  while now, about different heat-tolerant algae species and where they're found in
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  specific corals, and how coral reefs will change over the years as climate change
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  continues to change oceanic temperatures, and pH, and ranges, and so forth.
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  And so these sponges may become, like, a really important part of
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  what's gonna happen in the future, and finding out, like, how heat is going
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  to mess with algae within these things.
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  Are these algae providing energy like they do for corals to build skeletons?
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  Like, they provide, like, the calcium that they need?
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  Or do these sponges need something different?
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  It's gonna be really interesting to see how this research
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  continues and how it grows.
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  But I'm really looking forward to hearing from you.
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  Hit me up on social media, Instagram, TikTok, whatever that might be.
• 6:46
  I would love to hear from you.
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  My links are in the show notes.
• 6:48
  And of course, if you wanna support the work that we do, bringing you
• 6:51
  ocean resources, ocean news, all that kinda stuff, new research, and
• 6:54
  you wanna, listen to the podcast or YouTube, Instagram, TikTok, Facebook.
• 6:59
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• 7:01
  wanna support me, that'd be great.
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  Go to speakupforblue.com/patreon.
• 7:05
  That's speakupforblue.com/patreon.
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  I wanna thank you so much for supporting the podcast, for
• 7:11
  supporting the work that I do.
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  My name is Andrew Lewin, I'm the host of the How to Protect the Ocean podcast.
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  Have a great day.
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  We'll talk to you next time, and happy conservation.