scholarly journals From the Surface to the Deep-Sea: Bacterial Distributions across Polymetallic Nodule Fields in the Clarion-Clipperton Zone of the Pacific Ocean

2017 ◽  
Vol 8 ◽  
Author(s):  
Markus V. Lindh ◽  
Brianne M. Maillot ◽  
Christine N. Shulse ◽  
Andrew J. Gooday ◽  
Diva J. Amon ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Deep Sea ◽  
Polymetallic Nodule ◽  
The Pacific ◽  
The Pacific Ocean

scholarly journals Copper-binding ligands in deep-sea pore waters of the Pacific Ocean and potential impacts of polymetallic nodule mining on the copper cycle

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sophie A. L. Paul ◽  
Rebecca Zitoun ◽  
Ann Noowong ◽  
Mythili Manirajah ◽  
Andrea Koschinsky
Keyword(s):  
Pacific Ocean ◽  
Deep Sea ◽  
Organic Ligand ◽  
Copper Binding ◽  
Pore Waters ◽  
Potentially Toxic Metals ◽  
Polymetallic Nodule ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Nodule Mining

AbstractThe release of potentially toxic metals, such as copper (Cu), into the water column is of concern during polymetallic nodule mining. The bioavailability and thus toxicity of Cu is strongly influenced by its speciation which is dominated by organic ligand (L) complexation in seawater, with L-complexes being considered less bioavailable than free Cu2+. The presence of CuL-complexes in deep-sea sediments has, however, not been systematically studied in the context of deep-sea mining. We thus analyzed the Cu-binding L concentration ([L]) in deep-sea pore waters of two polymetallic nodule provinces in the Pacific Ocean, the Peru Basin and the Clarion-Clipperton-Zone, using competitive ligand equilibration–adsorptive stripping voltammetry. The pore-water dissolved Cu concentration ([dCu]) ranged from 3 to 96 nM, generally exceeding bottom water concentrations (4–44 nM). Based on fitting results from ProMCC and Excel, Cu was predominantly complexed by L (3–313 nM) in bottom waters and undisturbed pore waters. We conclude that processes like deep-sea mining are unlikely to cause a release of toxic Cu2+ concentrations ([Cu2+]) to the seawater as > 99% Cu was organically complexed in pore waters and the [Cu2+] was < 6 pM for 8 of 9 samples. Moreover, the excess of L found especially in shallow pore waters implied that even with a Cu release through mining activities, Cu2+ likely remains beneath toxic thresholds.

scholarly journals A biogeographic network reveals evolutionary links between deep-sea hydrothermal vent and methane seep faunas

2016 ◽  
Vol 283 (1844) ◽  
pp. 20162337 ◽  
Author(s):  
Steffen Kiel
Keyword(s):  
Pacific Ocean ◽  
Deep Sea ◽  
Hydrothermal Vents ◽  
Subduction Zones ◽  
Continental Margins ◽  
Stepping Stones ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Active Continental Margins ◽  
Ocean Ridge

Deep-sea hydrothermal vents and methane seeps are inhabited by members of the same higher taxa but share few species, thus scientists have long sought habitats or regions of intermediate character that would facilitate connectivity among these habitats. Here, a network analysis of 79 vent, seep, and whale-fall communities with 121 genus-level taxa identified sedimented vents as a main intermediate link between the two types of ecosystems. Sedimented vents share hot, metal-rich fluids with mid-ocean ridge-type vents and soft sediment with seeps. Such sites are common along the active continental margins of the Pacific Ocean, facilitating connectivity among vent/seep faunas in this region. By contrast, sedimented vents are rare in the Atlantic Ocean, offering an explanation for the greater distinction between its vent and seep faunas compared with those of the Pacific Ocean. The distribution of subduction zones and associated back-arc basins, where sedimented vents are common, likely plays a major role in the evolutionary and biogeographic connectivity of vent and seep faunas. The hypothesis that decaying whale carcasses are dispersal stepping stones linking these environments is not supported.

scholarly journals Association of deep-sea incirrate octopods with manganese crusts and nodule fields in the Pacific Ocean

2016 ◽  
Vol 26 (24) ◽  
pp. R1268-R1269 ◽  
Author(s):  
Autun Purser ◽  
Yann Marcon ◽  
Henk-Jan T. Hoving ◽  
Michael Vecchione ◽  
Uwe Piatkowski ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Deep Sea ◽  
The Pacific ◽  
The Pacific Ocean
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