Dissolved organic matter characterisation and temporal trends in Terra Nova Bay (Ross Sea, Antarctica)

2006 ◽  
Vol 70 (3) ◽  
pp. 405-414 ◽  
Author(s):  
Cristina Misic ◽  
Michela Castellano ◽  
Nicoletta Ruggieri ◽  
Paolo Povero
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Ross Sea ◽  
Temporal Trends ◽  
Terra Nova Bay ◽  
Terra Nova

Particulate organic matter release below melting sea ice (Terra Nova Bay, Ross Sea, Antarctica): Possible relationships with zooplankton

2021 ◽  
pp. 103510
Author(s):  
Alessandro Cau ◽  
Claudia Ennas ◽  
Davide Moccia ◽  
Olga Mangoni ◽  
Francesco Bolinesi ◽  
...  
Keyword(s):  
Organic Matter ◽  
Sea Ice ◽  
Particulate Organic Matter ◽  
Ross Sea ◽  
Terra Nova Bay ◽  
Terra Nova

scholarly journals Regulation of Microbial Activity Rates by Organic Matter in the Ross Sea during the Austral Summer 2017

2020 ◽  
Vol 8 (9) ◽  
pp. 1273
Author(s):  
Renata Zaccone ◽  
Cristina Misic ◽  
Filippo Azzaro ◽  
Maurizio Azzaro ◽  
Giovanna Maimone ◽  
...  
Keyword(s):  
Organic Matter ◽  
Ross Sea ◽  
Austral Summer ◽  
Trophic Levels ◽  
Offshore Area ◽  
Terra Nova Bay ◽  
Prokaryotic Abundance ◽  
Microbiological Parameters ◽  
Terra Nova ◽  
The Antarctic

The active prokaryotic communities proliferate in the ecosystems of the Antarctic Ocean, participating in biogeochemical cycles and supporting higher trophic levels. They are regulated by several environmental and ecological forcing, such as the characteristics of the water masses subjected to global warming and particulate organic matter (POM). During summer 2017, two polynyas in the Ross Sea were studied to evaluate key-microbiological parameters (the proteasic, glucosidasic, and phosphatasic activities, the microbial respiratory rates, the prokaryotic abundance and biomass) in relation to quantitative and qualitative characteristics of POM. Results showed significant differences in the epipelagic layer between two macro-areas (Terra Nova Bay and Ross Sea offshore area). Proteins and carbohydrates were metabolized rapidly in the offshore area (as shown by turnover times), due to high enzymatic activities in this zone, indicating fresh and labile organic compounds. The lower quality of POM in Terra Nova Bay, as shown by the higher refractory fraction, led to an increase in the turnover times of proteins and carbohydrates. Salinity was the physical constraint that played a major role in the distribution of POM and microbial activities in both areas.

The vertical flux of particulate matter in the polynya of Terra Nova Bay. Part II. Biological components

2003 ◽  
Vol 15 (2) ◽  
pp. 175-188 ◽  
Author(s):  
A. ACCORNERO ◽  
C. MANNO ◽  
F. ESPOSITO ◽  
M.C. GAMBI
Keyword(s):  
Organic Matter ◽  
Particulate Matter ◽  
Organic Carbon ◽  
Total Mass ◽  
Ross Sea ◽  
Late Summer ◽  
Faecal Pellets ◽  
Terra Nova Bay ◽  
Biogenic Carbon ◽  
Terra Nova

Downward fluxes of particulate matter were investigated in the polynya of Terra Nova Bay (western Ross Sea) from February 1995 to December 1997. The main biological components were siliceous phytoplankton (diatoms, silicoflagellates and parmales), abundant faecal pellets of several types and zooplankton (mainly shelled pteropods). Vertical fluxes of particles occurred mainly through diatoms and faecal pellets in the first and second part of the summer, respectively. The highest fluxes were recurrently observed in late summer, when faeces contributed up to 100% of organic carbon. Unusually high fluxes were recorded in winter 1995, when faecal pellets accounted for 84.6% of the organic carbon. Peak fluxes were always driven by the sinking of faecal pellets, that hence appear to be the most efficient vector of export in the polynya of Terra Nova Bay. A major flux component was the pteropod Limacina helicina, which repeatedly sank in high amounts after the growing season. In April–June, L. helicina probably transported biogenic carbon to deep layers as a passive sinker. The inclusion of pteropods in flux estimates resulted in values that were up to 20 (for total mass), 25 (for organic matter) and 48 (for carbonate) times higher than the previously measured fluxes. Fluxes are known to be biased by swimmers, but ultimately attention must be paid to a possible erroneous categorization of some zooplankton as swimmers to avoid severe underestimation of fluxes of total mass (up to 95% in our study), organic matter (up to 96%) and carbonate (up to 100%).

Organic matter composition in coastal sediments at Terra Nova Bay (Ross Sea) during summer 1995

Polar Biology ◽  
2000 ◽  
Vol 23 (4) ◽  
pp. 288-293 ◽  
Author(s):  
Antonio Pusceddu ◽  
Antonio Dell'Anno ◽  
Mauro Fabiano
Keyword(s):  
Organic Matter ◽  
Ross Sea ◽  
Coastal Sediments ◽  
Organic Matter Composition ◽  
Terra Nova Bay ◽  
Terra Nova

Stable isotope (δ13C and δ15N) composition of particulate organic matter, nutrients and dissolved organic matter during spring ice retreat at Terra Nova Bay

2010 ◽  
Vol 23 (1) ◽  
pp. 43-56 ◽  
Author(s):  
Stefano Cozzi ◽  
Carolina Cantoni
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Water Column ◽  
Particulate Organic Matter ◽  
Isotope Composition ◽  
Isotopic Signature ◽  
Δ13c And Δ15n ◽  
Terra Nova Bay ◽  
Fast Ice ◽  
Terra Nova

AbstractConcentration and isotope composition of particulate organic matter were analysed from five coastal sites on the annual fast ice and in the underlying water column at Terra Nova Bay. The highest increases of POC (< 2767 μM C) and PON (< 420 μM N) were reached in bottom ice and the unconsolidated platelet layer, linked with a large accumulation of nutrients and dissolved organic matter. Isotope POM composition in ice habitats was highly varied (δ13CPOC: -30.7 to -15.0‰, δ15NPON: 1.8–9.9‰). Constant negative δ13CPOC (> -29.3‰) and positive δ15NPON (< 9.4‰) values characterized the upper ice horizons, indicating the prevalence of aged detritus in these assemblages. By contrast, isotope composition (δ13CPOC: -15.0 to -29.7‰, δ15NPON: 1.8–9.6‰) and POC/PON ratios (6.2–12.6) changed markedly in bottom ice and interstitial water, even on short time scales, because of the combined effects of internal growth and mixing among freshly produced biomass. Sea ice breakout caused a large settling of particulates in the water column. It changed δ13CPOC (from 7.9 to 1.8‰) and δ15NPON (7.9–1.8‰) values in suspended particulate matter, indicating that inputs from fast ice strongly affect the isotopic signature of the particulate assemblage Antarctic coastal waters.

Particulate organic matter composition in Terra Nova Bay (Ross Sea, Antarctica) during summer 1990

1996 ◽  
Vol 8 (1) ◽  
pp. 7-13 ◽  
Author(s):  
M. Fabiano ◽  
P. Povero ◽  
R. Danovaro
Keyword(s):  
Organic Matter ◽  
Mixed Layer ◽  
Particulate Organic Matter ◽  
Ross Sea ◽  
Research Programme ◽  
Dna And Rna ◽  
Terra Nova Bay ◽  
Pack Ice ◽  
Antarctic Research ◽  
Terra Nova

Particulate organic matter was collected in the coastal waters of Terra Nova Bay during the Oceanographic Campaign of the Italian Antarctic Research Programme in summer (January–February) 1990. Particulate matter composition was analysed for organic carbon and nitrogen, carbohydrates, proteins, lipids, nucleic acids (DNA and RNA) and ATP. A vertical stratification was evident in the study area, and resulted from prior melting of the pack ice. Suspended organic matter in the mixed layer and below the mixed layer differed in quantitative and qualitative composition. Except for ATP, all the biochemical components showed higher concentrations in the mixed layer than in the deeper waters. The particulate organic matter in Terra Nova Bay was mostly detrital and of algal origin.

Short-term variations in particulate matter flux in Terra Nova Bay, Ross Sea

1997 ◽  
Vol 9 (2) ◽  
pp. 143-149 ◽  
Author(s):  
Mauro Fabiano ◽  
Mariachiara Chiantore ◽  
Paolo Povero ◽  
Riccardo Cattaneo-Vietti ◽  
Antonio Pusceddu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Water Column ◽  
Sediment Trap ◽  
Biochemical Composition ◽  
Ross Sea ◽  
Early Summer ◽  
Biological Processes ◽  
Terra Nova Bay ◽  
Terra Nova ◽  
Matter Flux

As part of the Ross Sea Marginal Ice Zone Ecology Project (ROSSMIZE) the summer organic matter flux through the water column was measured at 40 m depth in Terra Nova Bay. Water samples and material from a sediment trap on the sea-bottom were analysed for their biochemical composition. A close coupling between biochemical composition of the organic matter in the water column and the material collected in the sediment trap was found, resulting from complex interactions between physical and biological processes. The physical processes are related to break-up and melting of the ice cover and occur mainly in the early summer season, whilst biological processes play a key role in mid summer and, from the evidence from faecal pellets, are related to the primary production and consumption processes.

Role of filtering and biodeposition by Adamussium colbecki in circulation of organic matter in Terra Nova Bay (Ross Sea, Antarctica)

1998 ◽  
Vol 17 (1-4) ◽  
pp. 411-424 ◽  
Author(s):  
M. Chiantore ◽  
R. Cattaneo-Vietti ◽  
G. Albertelli ◽  
C. Misic ◽  
M. Fabiano
Keyword(s):  
Organic Matter ◽  
Ross Sea ◽  
Terra Nova Bay ◽  
Terra Nova ◽  
Adamussium Colbecki
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