WHAT THE EVIDENCE SAYS
Metagenomic and bioinformatic analysis of Clarion–Clipperton Zone sediments recovered a highly novel viral assemblage: more than 99% of viral clusters were absent from current reference databases. Inferred microbial hosts participate in carbon, nitrogen, phosphorus, sulfur and metal cycling, and the viral genomes contained auxiliary metabolic genes and evidence of gene exchange that could alter host metabolism and adaptation under metal-rich conditions.
WHY IT MATTERS / OUR READ
For seabed decisions, viruses belong in the ecological baseline rather than outside it. If microbial processes help regulate carbon and nutrient transformations in nodule sediments, then a baseline focused only on larger fauna risks missing part of the system through which disturbance could propagate.
CAVEATS / UNCERTAINTY
Host assignments and functions were inferred bioinformatically rather than measured as ecosystem-rate changes, and the study did not experimentally test mining disturbance. Novelty relative to reference databases also partly reflects how poorly deep-sea viruses have been sampled.
SOURCE
Nature Communications — primary study
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