A deep-sea isopod that consumes Sargassum sinking from the ocean’s surface

Logan M. Peoples, Mackenzie E. Gerringer, Johanna N.J. Weston, Rosa León-Zayas, Abisage Sekarore, Grace Sheehan, Matthew J. Church, Anna P.M. Michel, S. Adam Soule, Timothy M. Shank

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Most deep-ocean life relies on organic carbon from the surface ocean. While settling primary production rapidly attenuates in the water column, pulses of organic material can be quickly transported to depth in the form of food falls. One example of fresh material that can reach great depths across the tropical Atlantic Ocean and Caribbean Sea is the pelagic macroalgae Sargassum. However, little is known about the deep-ocean organisms able to use this food source. Here, we encountered the isopod Bathyopsurus nybelini at depths 5002–6288 m in the Puerto Rico Trench and Mid-Cayman Spreading Center using the Deep Submergence Vehicle Alvin. In most of the 32 observations, the isopods carried fronds of Sargassum. Through an integrative suite of morphological, DNA sequencing, and microbiological approaches, we show that this species is adapted to feed on Sargassum by using a specialized swimming stroke, having serrated and grinding mouthparts, and containing a gut microbiome that provides a dietary contribution through the degradation of macroalgal polysaccharides and fixing nitrogen. The isopod’s physiological, morphological, and ecological adaptations demonstrate that vertical deposition of Sargassum is a direct trophic link between the surface and deep ocean and that some deep-sea organisms are poised to use this material.

Original languageEnglish
Article number20240823
JournalProceedings of the Royal Society B: Biological Sciences
Volume291
Issue number2030
DOIs
StatePublished - Sep 11 2024

Keywords

  • Alvin
  • carbon sequestration
  • deep sea
  • gut microbiome
  • macroalgae
  • Munnopsidae

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