Shanghai Jiao Tong University along with multiple collaborating institutions including the University of Copenhagen and Lawrence Berkeley National Laboratory, have conducted an extensive investigation into microbial ecosystems in the deep ocean hadal zone.
Findings reveal an unprecedented level of taxonomic novelty, with 89.4% of identified microbial species previously unreported. The study demonstrated that selection pressures, favoring either streamlined or versatile adaptation strategies, dominate over neutral drift in shaping these extreme microbial ecosystems.
Hadal environments, located at depths exceeding 6,000 meters below sea level, remain among the least explored ecosystems on Earth. Manned submersibles capable of reaching full-ocean depth have been rare, with less than a dozen individuals visiting the deepest point of the Mariana Trench before 2019.