Results 11 to 20 of about 525 (166)

The Adaptive Evolution and Gigantism Mechanisms of the Hadal “Supergiant” Amphipod Alicella gigantea

Frontiers in Marine Science, 2021
Hadal trenches are commonly referred to as the deepest areas in the ocean and are characterized by extreme environmental conditions such as high hydrostatic pressures and very limited food supplies. Amphipods are considered the dominant scavengers in the
Wenhao Li, Wenhao Li, Wenhao Li, Faxiang Wang, Shouwen Jiang, Binbin Pan, Binbin Pan, Jiulin Chan, Qianghua Xu, Qianghua Xu, Qianghua Xu   +10 more
doaj   +3 more sources

Microbial Community Diversity Within Sediments from Two Geographically Separated Hadal Trenches [PDF]

Frontiers in Microbiology, 2019
Hadal ocean sediments, found at sites deeper than 6,000 m water depth, are thought to contain microbial communities distinct from those at shallower depths due to high hydrostatic pressures and higher abundances of organic matter.
Logan M. Peoples, Eleanna Grammatopoulou, Michelle Pombrol, Xiaoxiong Xu, Oladayo Osuntokun, Jessica Blanton, Eric E. Allen, Clifton C. Nunnally, Jeffrey C. Drazen, Daniel J. Mayor, Daniel J. Mayor, Douglas H. Bartlett   +11 more
doaj   +6 more sources

Anammox bacteria drive fixed nitrogen loss in hadal trench sediments. [PDF]

Proc Natl Acad Sci U S A, 2021
SignificanceHadal trenches represent the deepest part of the oceans, apparently offering adverse conditions for life, given their high hydrostatic pressure and wide separation from the productive surface waters. However, focusing of reactive organic matter in trench axis sediments potentially promotes complex yet unexplored microbial communities and ...
Thamdrup B, Schauberger C, Larsen M, Trouche B, Maignien L, Arnaud-Haond S, Wenzhöfer F, Glud RN.   +7 more
europepmc   +10 more sources

Microbiomes of Hadal Fishes across Trench Habitats Contain Similar Taxa and Known Piezophiles

mSphere, 2022
Hadal snailfishes are the deepest-living fishes in the ocean, inhabiting trenches from depths of ∼6,000 to 8,000 m. While the microbial communities in trench environments have begun to be characterized, the microbes associated with hadal megafauna remain
Jessica M. Blanton, Logan M. Peoples, Mackenzie E. Gerringer, Caroline M. Iacuaniello, Natalya D. Gallo, Thomas D. Linley, Alan J. Jamieson, Jeffrey C. Drazen, Douglas H. Bartlett, Eric E. Allen   +9 more
doaj   +6 more sources

Benthic Carbon Mineralization in Hadal Trenches: Insights From In Situ Determination of Benthic Oxygen Consumption [PDF]

Geophysical Research Letters, 2018
Hadal trenches have been proposed as depocenters of organic material and hot spots for organic matter mineralization. In this study, we for the first time quantified the total benthic O2 uptake in hadal trenches using in situ chamber incubations.
Min Luo, Ronnie N. Glud, Binbin Pan, Frank Wenzhöfer, Yunping Xu, Gang Lin, Duofu Chen   +6 more
doaj   +6 more sources

Three-layer circulation in the world deepest hadal trench. [PDF]

Nat Commun
The Challenger Deep (CD) is the deepest known hadal trench in the world. Due to challenges in data sampling at extreme ocean depths, the Lower Circumpolar Deep Water (LCDW) transport and ocean circulation structure in the CD remain unclear. By analyzing data from an extra-deep current meter mooring array, here we find a three-layer circulation in the ...
Jiang H, Xin X, Xu H, Zhou C, Vetter PA, Yu L, Long T, Chen Q, Tian J.   +8 more
europepmc   +4 more sources

Megathrust earthquake drives drastic organic carbon supply to the hadal trench. [PDF]

Sci Rep, 2019
AbstractThe giant 2011 Tohoku-oki earthquake has been inferred to remobilise fine-grained, young surface sediment enriched in organic matter from the slope into the >7 km deep Japan Trench. Yet, this hypothesis and assessment of its significance for the carbon cycle has been hindered by limited data density and resolution in the hadal zone.
Kioka A, Kioka A, Schwestermann T, Moernaut J, Ikehara K, Kanamatsu T, McHugh CM, Dos Santos Ferreira C, Wiemer G, Haghipour N, Kopf AJ, Eglinton TI, Strasser M.   +12 more
europepmc   +5 more sources

Structurally Diverse New Metabolites from Three Hadal Trench-Derived Microorganisms. [PDF]

ACS Omega
Two new tetraene lactone derivatives (1 and 2), two new α-pyrone derivatives (3 and 4), three compounds reported as natural products for the first time [an α-pyrone derivative (5), an indole-diketopiperazine alkaloid (6), and a β-amino acid derivative (8)], and 11 known compounds (7, 9-18), were obtained from microorganisms isolated from hadal trench ...
Peng Q, Huang W, Zhang X, Pang X, Liu Y, Ruan W, Li Q, Ding L, Jin H, Yang D, Wang J, Wang MW.   +11 more
europepmc   +4 more sources

Sediment Accumulation and Carbon Burial in Four Hadal Trench Systems

Journal of Geophysical Research: Biogeosciences, 2022
AbstractHadal trenches are considered to act as depocenters for organic material, although pathways for the material transport and deposition rates are poorly constrained. Here we assess focusing, deposition and accumulation of material and organic carbon in four hadal trench systems underlying different surface ocean productivities; the eutrophic ...
Kazumasa Oguri, Pere Masqué, Matthias Zabel, Heather A. Stewart, Gillian MacKinnon, Ashley A. Rowden, Peter Berg, Frank Wenzhöfer, Ronnie N. Glud   +8 more
  +10 more sources

Hadal Mud Dragons: First Insight Into the Diversity of Kinorhyncha From the Atacama Trench [PDF]

Frontiers in Marine Science, 2021
Deep-sea trenches are one of the last frontiers for deep-sea exploration and represent a large reservoir of undiscovered biodiversity. This applies in particular to organisms belonging to smaller-size classes, such as meiofauna. Among different meiofauna taxa, kinorhynchs represent a large gap in our knowledge about global marine biodiversity in ...
Katarzyna Grzelak, Katarzyna Grzelak, Daniela Zeppilli, Mauricio Shimabukuro, Mauricio Shimabukuro, Martin V. Sørensen   +5 more
openaire   +6 more sources