Biodiversity of cultivable psychrotrophic marine bacteria isolated from Terra Nova Bay (Ross Sea, Antarctica)
Luigi Michaud,Francescopaolo Di Cello,Matteo Brilli,Renato Fani,Angelina Lo Giudice,Vivia Bruni +5 more
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A set of 146 Antarctic marine isolates from the Ross Sea was characterized by a combination of molecular techniques in order to determine the degree of inter- and intraspecific variability, revealing the existence of horizontal gene transfer between strains belonging to the same and to different species.Abstract:
A set of 146 Antarctic marine isolates from the Ross Sea was characterized by a combination of molecular techniques in order to determine the degree of inter- and intraspecific variability. Isolates were analyzed by amplified rDNA restriction analysis (ARDRA) using the tetrameric enzyme AluI, resulting in 52 different groups, corresponding to at least 52 different bacterial species, indicating a high degree of interspecific variability. The phylogenetic position of bacteria belonging to some ARDRA groups was obtained by sequencing of 16S rDNA. Random amplified polymorphic DNA (RAPD) analysis, carried out on the largest ARDRA groups, revealed a high intraspecific genetic variability, too. The analysis of plasmid content revealed the existence of horizontal gene transfer between strains belonging to the same and to different species. A comparison of the whole body of morphological, physiological and biochemical data was finally carried out.read more
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Antarctic climate change and the environment
Peter Convey,Robert Bindschadler,G. di Prisco,Eberhard Fahrbach,Julian Gutt,Dominic A. Hodgson,Paul Andrew Mayewski,Colin Summerhayes,John Turner +8 more
TL;DR: The Southern Hemisphere climate system varies on timescales from orbital, through millennial to sub-annual, and is closely coupled to other parts of the global climate system as discussed by the authors.
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Vitamin B12 and iron colimitation of phytoplankton growth in the Ross Sea
Erin M. Bertrand,Mak A. Saito,Julie M. Rose,Christina R. Riesselman,Maeve C. Lohan,Abigail E. Noble,Peter A. Lee,Giacomo R. DiTullio +7 more
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Cold-water marine natural products
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Diversity and genomics of Antarctic marine micro-organisms
TL;DR: Insights from initial genomics studies on both cultivated organisms and genomes accessed through shotgun cloning of environmental samples suggest that there are many unique features of these organisms that facilitate survival in high-latitude, persistently cold environments.
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Pronounced summer to winter differences and higher wintertime richness in coastal Antarctic marine bacterioplankton.
TL;DR: This paper conducted a comparative study of marine bacterioplankton sampled at several time points over the annual cycle (12 occasions each) at sub-Antarctic Kerguelen Islands (KI) and Antarctic Peninsula (AP) coastal sites in order to establish a better understanding of the extent and nature of variation in diversity and community structure at these different latitudes.
References
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