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 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

Water column features and their relationship with sediments and benthic communities along the Victoria Land coast, Ross Sea, summer 2004

2006 ◽  
Vol 18 (4) ◽  
pp. 603-613 ◽  
Author(s):  
Paolo Povero ◽  
Michela Castellano ◽  
Nicoletta Ruggieri ◽  
Luis S. Monticelli ◽  
Vincenzo Saggiomo ◽  
...  
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Water Column ◽  
Nutritive Value ◽  
Latitudinal Gradient ◽  
Benthic Communities ◽  
Trophic Factors ◽  
Terra Nova Bay ◽  
Victoria Land ◽  
Terra Nova

The northern Victoria Land coastal marine environment was investigated during the late summer 2004, within the framework of the Latitudinal Gradient Project (LGP), to describe the physical, chemical and biological patterns of the water column and their relationship with the pelagic and benthic compartments, and to determine to what extent they change with latitude. A latitudinal gradient from Cape Adare to the Terra Nova Bay–Cape Russell area was determined on the basis of abiotic and trophic factors. Cape Adare had lower values of organic matter (particulate organic carbon < 150 μg l−1) available for the benthic communities, but this organic matter had good trophic quality. In Terra Nova Bay the particulate organic matter was quantitatively higher (organic carbon > 400 μg l−1), presumably reaching the bottom via faecal pellets, but was more detrital, although its nutritive value was still high (carbon protein content nearly 40%), as confirmed by the great quantity of phytopigments in the sediments (> 4.0 μg g−1). The benthic communities changed with latitude as well, partially reflecting the environmental and trophic gradient, but also showing a large within-area variability (except for the Cape Adare area), due to a complex array of variables that did not change with latitude.

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.

scholarly journals Enhanced rates of particulate organic matter remineralization by microzooplankton are diminished by added ballast minerals

2013 ◽  
Vol 10 (2) ◽  
pp. 3597-3625 ◽  
Author(s):  
F. A. C. Le Moigne ◽  
M. Gallinari ◽  
E. Laurenceau ◽  
C. L. De La Rocha
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Water Column ◽  
Particulate Organic Matter ◽  
Inorganic Nutrients ◽  
Dissolved Inorganic Nutrients ◽  
Biogenic Material ◽  
Dissolved Silicon ◽  
Rapid Kinetics ◽  
Kinetics Of

Abstract. To examine the potentially competing influences of microzooplankton and calcite mineral ballast on organic matter remineralization, we incubated diatoms in darkness in rolling tanks with and without added calcite minerals (coccoliths) and microzooplankton (rotifers). Concentrations of particulate organic matter (POM), suspended or in aggregates, of dissolved organic matter (DOM), and of dissolved inorganic nutrients were monitored over 8 days. The presence of rotifers enhanced the remineralization of ammonium and phosphate, but not dissolved silicon, from the biogenic material, up to 40% of which became incorporated into aggregates early in the experiment. Added calcite resulted in rates of excretion of ammonium and phosphate by rotifers that were depressed by 67% and 36%, respectively, demonstrating the potential for minerals to inhibit the destruction of POM in the water column by zooplankton. Lastly, the presence of the rotifers and added calcite minerals resulted in more rapid kinetics of aggregation, although not a greater overall amount of aggregation during the experiment.

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.

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

scholarly journals Enhanced rates of particulate organic matter remineralization by microzooplankton are diminished by added ballast minerals

2013 ◽  
Vol 10 (9) ◽  
pp. 5755-5765 ◽  
Author(s):  
F. A. C. Le Moigne ◽  
M. Gallinari ◽  
E. Laurenceau ◽  
C. L. De La Rocha
Keyword(s):  
Organic Matter ◽  
Particulate Matter ◽  
Dissolved Organic Matter ◽  
Water Column ◽  
Particulate Organic Matter ◽  
Initial Rate ◽  
Inorganic Nutrients ◽  
Dissolved Inorganic Nutrients ◽  
Dissolved Silicon

Abstract. To examine the potentially competing influences of microzooplankton and calcite mineral ballast on organic matter remineralization, we incubated diatoms in darkness in rolling tanks with and without added calcite minerals (coccoliths) and microzooplankton (rotifers). Concentrations of particulate organic matter (POM in suspension or in aggregates), of dissolved organic matter (DOM), and of dissolved inorganic nutrients were monitored over 8 days. The presence of rotifers enhanced the remineralization of ammonium and phosphate, but not dissolved silicon, from the biogenic particulate matter, up to 40% of which became incorporated into aggregates early in the experiment. Added calcite resulted in rates of excretion of ammonium and phosphate by rotifers that were depressed by 67% and 36%, respectively, demonstrating the potential for minerals to inhibit the destruction of POM by zooplankton in the water column. Lastly, the presence of the rotifers and added calcite minerals resulted in a more rapid initial rate of aggregation, although not a greater overall amount of aggregation during the experiment.

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