Multiproxy quantitative paleoceanographic dataset from late Quaternary marine sediment archives in the western Ross Sea (Antarctica).

The past ice sheet dynamics and the timing of retreat events in the paleo-record in the Ross Sea is an issue still few understood. In order to contribute to this topic, we provide a multiproxy data from marine sediment archives (cores and box cores) collected in three sites in the Central Basin (Western Ross Sea, Antarctica). Each site recorded different environments, affected by different oceanographic conditions and sedimentary regime.

Microbial Fe(III) reduction as a potential iron source from Holocene sediments beneath Larsen Ice Shelf.

Recent recession of the Larsen Ice Shelf C has revealed microbial alterations of illite in marine sediments, a process typically thought to occur during low-grade metamorphism. In situ breakdown of illite provides a previously-unobserved pathway for the release of dissolved Fe to porewaters, thus enhancing clay-rich Antarctic sub-ice shelf sediments as an important source of Fe to Fe-limited surface Southern Ocean waters during ice shelf retreat after the Last Glacial Maximum. When sediments are underneath the ice shelf, Fe from microbial reductive dissolution of illite/Fe-oxides may be exported to the water column.

sp. nov., a marine bacterium from deep-sea sediment.

A Gram-stain-negative, rod-shaped and motile strain, designated PAMC 27536, was isolated from deep-sea sediment in the East Sea, Korea. Analysis of the 16S rRNA gene sequence of the strain showed an affiliation with the genus . Phylogenetic analyses revealed that strain PAMC 27536 was related most closely to CL-YJ9 with a 16S rRNA gene sequence similarity of 98.