The Deep-Sea Podcast

• PRESSURISED: 061 – Trench nutrient cycling with Ronnie N. Glud

  Welcome to the PRESSURISED version of episode 61, just the science, none of the waffle PRESSURISED: Trench nutrient cycling with Ronnie N. Glud | The Deep Sea Podcast | Episode 61   Guest Interview: Nutrient cycling in the hadal trenches (6 to 11 km) and the crucial role they play in global element cycling. Professor Ronnie N. Glud, a leading biochemist and Director of the Danish Centre for Hadal Research (HADAL) talks us through how the trenches, once thought to be barren, are actually "dynamic deep-sea hotspots with intensified microbial activity and diversity". Learn about: How hadal trenches act as "depocenters" for organic material, leading to microbial activity that's 2 to 6 times higher than in adjacent abyssal sites. The surprising diversity of microbial "generalists" that easily adapt to the immense pressure and low temperatures, aided by viruses that facilitate "horizontal gene transfer". The return of full anaerobic diagenetic processes (like sulphate reduction and anammox) in trench sediments, making them significant sinks for fixed nitrogen. The role of marine snow and seismic activity in efficiently transporting organic matter and, surprisingly, pollutants like PCBs and heavy metals to these remote depths. Why these trenches are not isolated environments but are highly connected to surface ocean processes, even responding to climate-driven changes in primary production.   We also have a surprise blobfish guest!   Support the show The podcast is self-sustaining (just) thanks to our lovely listeners. Thom and Alan take no money for the show. All money is put back into running it. Here’s a link to our page on how to support us, from the free options to becoming a patron of the show. We want to say a huge thank you to those patrons who have already pledged to support us: C Wright Check out our podcast merch here!   Feel free to get in touch with us with questions or your own tales from the high seas on: [email protected] We’d love to actually play your voice, so feel free to record a short audio note on our brand new answerphone! https://www.speakpipe.com/deepseapodvoicemail Thanks again for tuning in; we’ll deep-see you next time!   Find out more Social media BlueSky: @deepseapod.com Twitter: @DeepSeaPod Instagram: @deepsea_podcast Keep up with the team on social media Twitter:  Alan - @Hadalbloke Thom - @ThomLinley  Instagram:  Thom - @thom.linley  Inkfish - @inkfishexpeditions BlueSky: Thom @thomaslinley.com Reference list   Flourishing chemosynthetic life at the greatest depths of hadal trenches Element cycling and microbial life in the hadal realm   Credits Theme: Hadal Zone Express by Märvel Logo image: Ronnie N. Glud

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• Trench nutrient cycling with Ronnie N. Glud

  In this episode… Welcome back to the Deep-Sea Podcast, your punk take on all things deep sea! Join Dr. Thom Linley and Professor Alan Jamieson as they dive into the latest from the abyssal plain and beyond. Deep Sea News Highlights: We kick things off with a rethinking of the deep-sea boundary! Professor Alan Jamieson discusses his recent "food for thought" paper that challenges the long-held 200-meter definition, arguing for a more scientifically relevant boundary of 1,000 meters. Find out why this seemingly arbitrary line might be doing "a lot of damage" to our understanding and attitude towards the deep sea.   Also in the news, get ready for updates on: A new story map on mesophotic reefs following the Deepwater Horizon spill in the Gulf of Mexico. An exciting project charting shipwrecks in the Great Lakes using cutting-edge ROV technology for 3D modelling. The discovery of a deep-sea limpet named after a One Piece character, found at an astonishing 6 kilometres deep! How Earth's deep-sea microbes are being used to model potential life on Jupiter's moon Europa. Groundbreaking research on a new bioplastic that vanishes by over 80% in extreme deep-sea conditions, offering hope for sustainable solutions.   Guest Interview: Nutrient cycling in the hadal trenches (6 to 11 km) and the crucial role they play in global element cycling. Professor Ronnie N. Glud, a leading biochemist and Director of the Danish Centre for Hadal Research (HADAL), talks us through how the trenches, once thought to be barren, are actually "dynamic deep-sea hotspots with intensified microbial activity and diversity". Learn about: How hadal trenches act as "depocenters" for organic material, leading to microbial activity that's 2 to 6 times higher than in adjacent abyssal sites. The surprising diversity of microbial "generalists" that easily adapt to the immense pressure and low temperatures, aided by viruses that facilitate "horizontal gene transfer". The return of full anaerobic diagenetic processes (like sulphate reduction and anammox) in trench sediments, making them significant sinks for fixed nitrogen. The role of marine snow and seismic activity in efficiently transporting organic matter and, surprisingly, pollutants like PCBs and heavy metals to these remote depths. Why these trenches are not isolated environments but are highly connected to surface ocean processes, even responding to climate-driven changes in primary production.   We also have a surprise blobfish guest!   Support the show The podcast is self-sustaining (just) thanks to our lovely listeners. Thom and Alan take no money for the show. All money is put back into running it. Here’s a link to our page on how to support us, from the free options to becoming a patron of the show. We want to say a huge thank you to those patrons who have already pledged to support us: C Wright Check out our podcast merch here!   Feel free to get in touch with us with questions or your own tales from the high seas on: [email protected] We’d love to actually play your voice, so feel free to record a short audio note on our brand new answerphone! Thanks again for tuning in; we’ll deep-see you next time!   Find out more Social media BlueSky: @deepseapod.com Twitter: @DeepSeaPod Instagram: @deepsea_podcast   Keep up with the team on social media Twitter:  Alan - @Hadalbloke Thom - @ThomLinley  Instagram:  Thom - @thom.linley  Inkfish - @inkfishexpeditions BlueSky: Thom @thomaslinley.com   Reference list The graves of Edinburgh John Young Buchanan - Chemist on the Challenger Expedition Edward Forbes - Deep-sea naturalist Sir John Murray - Father of modern oceanography Notable people buried in Dean Cemetery   Discord Updates Join our Patreon to get access to the Discord The supergiant amphipod wiki page News Interview Flourishing chemosynthetic life at the greatest depths of hadal trenches Element cycling and microbial life in the hadal realm   News/Further Reading Reconsidering the term ‘deep sea’ | ICES Journal of Marine Science | Oxford Academic Mesophotic and Deep Benthic Communities Expeditions Historic Shipwrecks Come to Light in the Great Lakes - The New York Times Lake Ontario National Marine Sanctuary -- Live! Deep-sea Limpet named after OnePiece character Microbial Life on Earth: A Model for the Cosmos Reef Chat from Moku Art Studio with Paola Santiago Padua and Meghan Jones  Scientists find bioplastic that vanishes 80% even in extreme deep-sea conditions Unveiling deep-sea biodegradation of microbially produced lactate-based polyester (LAHB) via plastisphere metagenomics and metatranscriptomics - ScienceDirect Alan appeared on another podcast too: We've Only Explored 0.001% of the Deep Sea - What's Lurking Below? | Discover Magazine Podcast    Credits Theme: Hadal Zone Express by Märvel Logo image: Ronnie N. Glud

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• PRESSURISED: 060 – Mesophotic Reefs with Yi-Kai Tea

  Welcome to the PRESSURISED version of episode 60, just the science, none of the waffle PRESSURISED: Mesophotic Reefs with Yi-Kai Tea | The Deep Sea Podcast | Episode 60   In this month's episode, we discuss mesophotic reefs, the deeper extents of coral reefs that have been overlooked in the past. It’s a wild ride that leads us to homemade hyperbaric chambers, the aquarium trade and the world’s most expensive fish. Strap in for a rollercoaster ride as we dive to the limits of scuba.    Find out more at deepseapod.com Social media BlueSky: @deepseapod.com Twitter: @DeepSeaPod Instagram: @deepsea_podcast Keep up with the team on social media Twitter:  Alan - @Hadalbloke Thom - @ThomLinley  Instagram:  Thom - @thom.linley  Inkfish - @inkfishexpeditions BlueSky: Thom @thomaslinley.com Reference list Kai’s website Instagram Bluesky Twitter Mesophotic fish collecting video Taken by Ghislain Bardout from Under The Pole. The diver is Timothy Bennett, and he was collecting for the Australian Museum Research Expedition.   One of Kai’s recent mesophotic reef papers The hyperbaric chamber for fishes The paper where the chamber is described The peppermint Angelfish Kai’s video of the peppermint angel Teresa’s project Her recent paper on black corals   Support the show The podcast is only possible with your help. Here’s a link to our page on how to support us, from the free options to becoming a patron of the show. We want to say a huge thank you to those patrons who have already pledged to support us: Smorgindorg Check out our podcast merch here!   Feel free to get in touch with us with questions or your own tales from the high seas on: [email protected] We’d love to actually play your voice so feel free to record a short audio note!   Thanks again for tuning in; we’ll deep-see you next time!   Glossary BRUV - Baited Remote Underwater Video Closed-circuit rebreather - An advanced form of scuba where your breath is recycled, and you don’t make any bubbles Husbandry - Keeping an animal in captivity IPFC - Indo-Pacific Fish Conference Marine Snow - The particles that rain down to the seabed; poop, dead things, cast shells Mesophotic Reef - The deeper extent of coral reefs where the light is reduced Rebreather - See Closed-circuit rebreather ROV - Remotely Operated Vehicle Systematics - The structure and relationships between species   Credits Theme: Hadal Zone Express by Märvel Logo image: The peppermint angel by Yi-Kai Tea

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• Mesophotic Reefs with Yi-Kai Tea

  In this episode… Sorry the episode is a little late…. But it’s a bumper!    Alan has been checking out hypercars while sharks have been checking out Thom. In the news, we have art, anglerfish, squid and sea spiders. Then an orafish turns up, and we are all doomed.   In this month's episode, we discuss mesophotic reefs, the deeper extents of coral reefs that have been overlooked in the past. It’s a wild ride that leads us to homemade hyperbaric chambers, the aquarium trade and the world’s most expensive fish. Strap in for a rollercoaster ride as we dive to the limits of scuba.  Support the show The podcast is only possible with your help. Here’s a link to our page on how to support us, from the free options to becoming a patron of the show. We want to say a huge thank you to those patrons who have already pledged to support us: Smorgindorg Check out our podcast merch here!   Feel free to get in touch with us with questions or your own tales from the high seas on: [email protected] We’d love to actually play your voice so feel free to record a short audio note!   Thanks again for tuning in; we’ll deep-see you next time!   Find out more at deepseapod.com Social media BlueSky: @deepseapod.com Twitter: @DeepSeaPod Instagram: @deepsea_podcast Keep up with the team on social media Twitter:  Alan - @Hadalbloke Thom - @ThomLinley  Instagram:  Thom - @thom.linley  Inkfish - @inkfishexpeditions BlueSky: Thom @thomaslinley.com Reference list Discord Updates Join our Patreon to get access to the Discord   The New Zealand wandering anemone   The supergiant amphipod wiki page   News Under the Sea Exhibit   Anglerfish radiation paper Alexe's website   Oarfish are turning up everywhere Andrew and Thom’s oarfish blog   DOSI new podcast - Think Deep!   Marine Snow Carbon Transport   Methane Powered Sea-Spiders   Ancient Oceans filled with Squid Interview Kai’s website Instagram Bluesky Twitter Mesophotic fish collecting video Taken by Ghislain Bardout from Under The Pole. The diver is Timothy Bennett, and he was collecting for the Australian Museum Research Expedition.   One of Kai’s recent mesophotic reef papers   The hyperbaric chamber for fishes   The paper where the chamber is described   FishPix   The peppermint Angelfish   Kai’s video of the peppermint angel   Teresa’s project Her recent paper on black corals   Coffee with Andrew Ribbonfish larvae paper   Glossary BRUV - Baited Remote Underwater Video Closed-circuit rebreather - An advanced form of scuba where your breath is recycled, and you don’t make any bubbles Husbandry - Keeping an animal in captivity IPFC - Indo-Pacific Fish Conference Marine Snow - The particles that rain down to the seabed; poop, dead things, cast shells Mesophotic Reef - The deeper extent of coral reefs where the light is reduced Rebreather - See Closed-circuit rebreather ROV - Remotely Operated Vehicle Systematics - The structure and relationships between species   Credits Theme: Hadal Zone Express by Märvel Logo image: The peppermint angel by Yi-Kai Tea

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• PRESSURISED: 059 - eDNA with Georgia Nester

  eDNA with Georgia Nester | The Deep Sea Podcast | Episode 59 Welcome to the PRESSURISED version of episode 59, just the science, none of the waffle   For this month’s interview, we speak with Dr. Georgia Nester, a colleague of Alan’s from the University of Western Australia, about eDNA (Environmental DNA is any genetic material left behind by organisms in an environment). She talks about how several collection methods, eg.: Niskin bottles, sponges and paper filters, located on the deep-sea lander system, can retrieve different types of eDNA from the deep. Georgia also touches on how diel migrators can really mess with eDNA data, and larvae gave her a surprise when she kept getting hits from very deep-living fish in her surface samples. Georgia even used a water sample to locate surprise eDNA evidence of the Giant Squid in Australian waters, which Al takes as a chance to remind  Thom of his Antarctic colossal squid failure.  Alan talks about how valuable he thinks eDNA is, how it can give a great snapshot of what can’t be seen on the footage or in the submersible, and how it might be able to narrow down species that are difficult to catch, like Bassozetus cusk eels.  Support the show The show is self-sustaining, but we couldn’t do it without you. Here’s a link to our page on how to support us, from the free options to becoming a patron of the show. We want to say a huge thank you to those patrons who have already pledged to support us: Rainstorm Wolfe Shea Racist Teacup Don’t forget that becoming a patron also gives you access to the Discord and a like-minded community of deep-sea folks, including scientists, artists, students, and previous guests! Deep-sea news often breaks there first. Check out our podcast merch here!   Feel free to get in touch with us with questions or your own tales from the high seas at: [email protected] We’d love to actually play your voice, so feel free to record a short audio note!   Thanks again for tuning in; we’ll deep-see you next time!   Find out more Social media BlueSky: @deepseapod.com Twitter: @DeepSeaPod Instagram: @deepsea_podcast Keep up with the team on social media Twitter:  Alan - @Hadalbloke Thom - @ThomLinley  Instagram:  Thom - @thom.linley  Inkfish - @inkfishexpeditions BlueSky: Thom @thomaslinley.com   Reference list Nester, G. M., Suter, L., Kitchener, J. A., Bunce, M., Polanowski, A. M., Wasserman, J., & Deagle, B. (2024). Long-distance Southern Ocean environmental DNA (eDNA) transect provides insights into spatial marine biota and invasion pathways for non-native species. Science of the Total Environment, 951, 175657.   Takahashi, M., Saccò, M., Kestel, J. H., Nester, G., Campbell, M. A., Van Der Heyde, M., ... & Allentoft, M. E. (2023). Aquatic environmental DNA: A review of the macro-organismal biomonitoring revolution. Science of the Total Environment, 873, 162322.   Credits Theme: Hadal Zone Express by Märvel Logo image: Microsoft CoPilot

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