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Marine Biologists Discover Unexpected Biodiversity on the Ocean Floor

February 18, 2024
in Science
Marine Biologists Discover Unexpected Biodiversity on the Ocean Floor
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Field of Manganese Nodules on the Sea Floor

Scientists have uncovered unexpected biodiversity in deep-sea environments, particularly around hydrothermal vents and manganese nodules, through detailed collection and DNA analysis of marine species. The findings, indicating isolated and unique species as well as potential reproductive habitats within nodules, underscore the ecological importance of these areas. Marine ecologist Sabine Gollner stresses the need for caution in considering deep-sea mining, given the high extinction risk to these unique species. Field of manganese nodules on the sea floor. Credit: ROV KIEL6000 GEOMAR

“We should be extremely careful with potential future deep-sea mining, as these unique species carry high extinction risk.”

The deep oceans, with their hydrothermal vents and manganese nodule fields, are more biologically diverse than previously thought. This finding is highlighted in the dissertation of NIOZ marine biologist Coral Diaz-Recio Lorenzo, which was recently presented for defense at Utrecht University.

“This research – again – shows that we should be extremely careful before allowing commercial deep-sea mining for minerals that are found in these habitats,” marine ecologist Sabine Gollner of NIOZ says.

Isolated animals

For her PhD-research, Diaz-Recio Lorenzo looked at the copepods that she collected at hydrothermal vents in the Lau-basin, on the border of the Australian and the Pacific plate, near the island of Tonga. Using large underwater robots, she collected a number of these tiny, shrimp-like animals, that dominate these habitats. The samples were collected from different locations within one basin.

Through DNA analysis, she then showed that different populations lived rather isolated from each other, with little interactions between the populations. From basins further away, she collected specimens that looked the same, but should even be considered different species, based on the composition of their DNA.

Coral Diaz Recio Lorenzo and Team

Coral Diaz-Recio Lorenzo (middle) diving with the French submersible Nautile to collect samples from the hydrothermal vents. Vessel: Porquois Pas? Credit: Christophe Brandily

Living on nodules

The second part of her research concerned samples of manganese nodules, that were collected from the Clarion Clipperton Zone, a large region at depths of four to five thousand meters in the Pacific Ocean.

She found that in these nodules, typically 10 to 15 individuals, but sometimes even more than 200 individuals of nematodes, copepods, and other animals can be found. Many of these animals appeared specific to the nodules because they were not found in the samples of the sediments that were collected around these nodules. Some animals may even use the nodules as a habitat for reproduction, as Diaz-Recio Lorenzo found eggs inside the nodules.

Extremely careful

NIOZ Marine ecologist Sabine Gollner, the co-promotor of the PhD-research by Diaz-Recio Lorenzo, is highly surprised by the uniqueness and the diversity of life that is found around the hydrothermal vents and in the manganese nodules.

“The locations that were studied are areas that are currently explored for minerals. But this research shows that we should be extremely careful with regards to potential future deep-sea mining, as these unique species carry high extinction risk.”

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/marine-biologists-discover-unexpected-biodiversity-on-the-ocean-floor/

Tags: biologistsMarinescience
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