Biogeochemical cycling of Pb in the coastal marine environment at Terra Nova Bay, Ross Sea

2003 ◽  
Vol 15 (4) ◽  
pp. 425-432 ◽  
Author(s):  
S. DALLA RIVA ◽  
M.L. ABELMOSCHI ◽  
M. CHIANTORE ◽  
M. GROTTI ◽  
E. MAGI ◽  
...  
Keyword(s):  
Ross Sea ◽  
Ice Core ◽  
Concentration Data ◽  
Odontaster Validus ◽  
Terra Nova Bay ◽  
Coastal Marine ◽  
Pack Ice ◽  
Laternula Elliptica ◽  
Trematomus Bernacchii ◽  
Terra Nova

The biogeochemical cycle of lead in the marine coastal environment of Terra Nova Bay has been investigated by determining the lead concentration in a large number of matrices: marine sediments, pack ice, snow, seawater, marine microlayer, aerosol and eight species of marine organisms (the bivalve molluscs Adamussium colbecki and Laternula elliptica, the seastar Odontaster validus, the sea urchin Sterechinus neumayeri, the fish Trematomus bernacchii, the seaweeds Iridaea cordata and Phyllophora antarctica, and the nemertine worm Parborlasia corrugatus). The study of solid speciation of sediment showed that the site is not influenced by human activity and is hence suitable to examine natural processes. The concentration values found in the suspended paniculate matter (SPM) of pack ice core, aerosol, marine microlayer and seawater as well as the particulate morphology, investigated by SEM, seem to support the hypothesis that particulate lead is transferred from the atmosphere to the water column through three different mechanisms: (i) release of SPM from the pack ice during its melting, (ii) input from the continental land through wet deposition, (iii) transport by aerosol and marine microlayer. Concentration data both in the whole organism and in some target organs indicated two suitable biomonitor organisms: the bivalva Laternula elliptica (particularly its digestive gland) and the fish Trematomus bernacchii (particularly its bones).

Vitellogenin gene expression in males of the Antarctic fish Trematomus bernacchii from Terra Nova Bay (Ross Sea): A role for environmental cadmium?

Chemosphere ◽  
2007 ◽  
Vol 66 (7) ◽  
pp. 1270-1277 ◽  
Author(s):  
Adriana Canapa ◽  
Marco Barucca ◽  
Stefania Gorbi ◽  
Maura Benedetti ◽  
Sara Zucchi ◽  
...  
Keyword(s):  
Gene Expression ◽  
Ross Sea ◽  
Antarctic Fish ◽  
Terra Nova Bay ◽  
Trematomus Bernacchii ◽  
Terra Nova ◽  
Vitellogenin Gene ◽  
The Antarctic

scholarly journals Light environment and seasonal dynamics of microalgae in the annual sea ice at Terra Nova Bay, Ross Sea, Antarctica

2007 ◽  
Vol 19 (1) ◽  
pp. 83-92 ◽  
Author(s):  
L. Lazzara ◽  
I. Nardello ◽  
C. Ermanni ◽  
O. Mangoni ◽  
V. Saggiomo
Keyword(s):  
Sea Ice ◽  
Ross Sea ◽  
Optical Methods ◽  
Spatial And Temporal Patterns ◽  
Physical Conditions ◽  
Terra Nova Bay ◽  
Production Values ◽  
Pack Ice ◽  
Terra Nova ◽  
Platelet Ice

We investigated the physical conditions of the Spring pack ice environment at Terra Nova Bay to understand their influence on the structure and physiology of sympagic microalgae. Bio-optical methods were used to study the availability and spectral quality of solar radiation, both inside and underneath the ice cover. Pack ice thickness was around 2.5 m, with a temperature between −2 and −7°C. On average, only 1.4% of surface PAR penetrated to the bottom ice and less than 0.6% below platelet ice level. Surface UV-B radiation under the bottom ice was 0.2–0.4%. Biomass concentrations up to 2400 mg Chl a m−3, dominated by two species of diatoms (Entomoneis kjellmannii and Nitschia cf. stellata), showed marked spatial and temporal patterns. Maximum values were in the platelet ice during the first half of November, and in the bottom ice two weeks later. Strong shade adaptation characteristics emerged clearly and explained the relevant abundance of microalgae within the sea ice, with specific absorption coefficients (a*) as low as 0.005 m2 (mg Chl a)−1 and the photo-acclimation index (Ek) in the range of in situ irradiance. The biomass specific production values were low, around 0.12–0.13 mg C mg Chl a−1 h−1. The hypothesis suggesting bottom ice colonization by platelet ice microalgae is supported here.

Upper ocean layer dynamics and response to atmospheric forcing in the Terra Nova Bay polynya, Antarctica

2010 ◽  
Vol 22 (3) ◽  
pp. 319-329 ◽  
Author(s):  
Andrea Cappelletti ◽  
Paola Picco ◽  
Tiziana Peluso
Keyword(s):  
Large Scale ◽  
Ross Sea ◽  
Meteorological Data ◽  
Surface Currents ◽  
Atmospheric Forcing ◽  
Concentration Data ◽  
Large Scale Circulation ◽  
Terra Nova Bay ◽  
Adcp Data ◽  
Terra Nova

AbstractA one-year time series of Acoustic Doppler Current Profiler (ADCP) data was collected in Terra Nova Bay (TNB) polynya (Ross Sea, Antarctica) during 2000. Together with Automatic Weather Station (AWS) Eneide meteorological data and Special Sensor Microwave Imager (SSM/I) ice concentration data, ADCP data were analysed to investigate upper layer dynamics and variability due to atmospheric forcing. Empirical Orthogonal Function (EOF) analysis was performed to separate the surface variability caused by local forcing from the large-scale circulation component. In particular, the first mode represented the barotropic circulation while the second the stronger surface currents. The decrease in shelf water density from melting sea ice resulted in an off-shore density gradient producing a southern shift in the circulation. This result proved to be consistent with the in situ data acquired during February–April at 120 m depth. The observed variability of the surface currents was assessed with respect to the thermal wind equation and the steady Ekman model. Strong katabatic winds shifted the surface currents eastward with respect to the general north-eastern circulation. The wind stress acted as a relevant forcing for the surface large-scale circulation in TNB, but had negligible effects on the vertically integrated transport.

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.

Reproduction in three species of fish from the Ross Sea and Mawson Sea

1996 ◽  
Vol 8 (2) ◽  
pp. 185-192 ◽  
Author(s):  
M. Vacchi ◽  
R. Williams ◽  
M. La Mesa
Keyword(s):  
Egg Size ◽  
Ross Sea ◽  
Spawning Period ◽  
Reproductive Characteristics ◽  
Terra Nova Bay ◽  
Mawson Sea ◽  
Trematomus Bernacchii ◽  
Terra Nova ◽  
Casey Station

Reproductive characteristics are compared of the nototheniids Trematomus bernacchii and T. hansoni and the channichthyid Chionodraco hamatus caught in summer at Terra Nova Bay (Ross Sea) and caught all the year round in the waters off Casey Station (Mawson Sea). Whilst spawning of T. bernacchii took place in October–November off Casey and probably at Terra Nova Bay, the spawning period of T. hansoni differed between the sites (September–November off Casey, December–February at Terra Nova Bay). The spawning period also differed between sites for C. hamatus (August–October off Casey, December–February at Terra Nova Bay). Fecundity was higher and egg size was lower in nototheniid species (c, 8000 eggs of 3–4 mm) than in channichthyid (c. 4000 eggs of 4–5 mm). Moreover, the fecundity was lower and egg size higher in the specimens from Terra Nova Bay when compared to Casey.

Predator–prey relationship between the nototheniid fish Trematomus bernacchii and the Antarctic scallop Adamussium colbecki at Terra Nova Bay (Ross Sea)

2000 ◽  
Vol 12 (1) ◽  
pp. 64-68 ◽  
Author(s):  
Marino Vacchi ◽  
R. Cattaneo-Vietti ◽  
M. Chiantore ◽  
M. Dalu
Keyword(s):  
Ross Sea ◽  
Size Structure ◽  
Medium Size ◽  
Predator Prey ◽  
Size Classes ◽  
Terra Nova Bay ◽  
Trematomus Bernacchii ◽  
Terra Nova ◽  
The Impact ◽  
Adamussium Colbecki

Little information is available regarding predator-prey interactions in High-Antarctic coastal systems. In this study, the predation of Trematomus bernacchii (Pisces: Nototheniidae) on Adamussium colbecki (Mollusca: Pectinidae) is described and the related impact on the population structure of the mollusc is hypothesized. Fishes and scallops were collected during several expeditions between 1990/91 and 1997/98 summers, in nearshore waters at Terra Nova Bay (Antarctica). Adamussium colbecki was the main food item of T. bernacchii and an ontogenetic prey-size selection was observed. The predation was mainly on medium size classes of the scallop. These were lacking in the A. colbecki population sampled in the same period suggesting that the impact of fish-feeding on the size structure of the natural population of the mollusc may be substantial. Two size classes of the Adamussium population were not preyed on. Large adults avoid predation either because of the limits for mouth gape in the fish or by swimming avoidance capability, while smaller scallops may not be preyed upon because they are attached through byssus threads to very mobile large adults.

Diet of two coastal nototheniid fish from Terra Nova Bay, Ross Sea

1994 ◽  
Vol 6 (1) ◽  
pp. 61-65 ◽  
Author(s):  
M. Vacchi ◽  
M. La Mesa ◽  
A. Castelli
Keyword(s):  
Feeding Behaviour ◽  
Ross Sea ◽  
Feeding Habits ◽  
Important Prey ◽  
Terra Nova Bay ◽  
Trematomus Bernacchii ◽  
Terra Nova ◽  
Adamussium Colbecki ◽  
Nototheniid Fish ◽  
Epibenthic Invertebrates

An investigation into the feeding habits of two demersal nototheniids, Trematomus bernacchii and T. centronotus, showed that the most important prey were polychaetes, molluscs and euphausiids for T. bernacchii and polychaetes and amphipods for T. centronotus. Epifaunal (e.g. Barrukia cristata) and tube-dwelling polychaetes (Amphicteis cfr. midas and Amythas membranifera) were common in the diet of both species. Bivalvia including Adamussium colbecki were found in the diet of T. bernacchii. Epifaunal gastropods (Trochidae) were an occasional prey for T. centronotus. Amphipods (mainly Acanthonotozomatidae) and the euphausiid Euphausia frigida were the main crustacean food of T. centronotus and T. bernacchii respectively. Our data suggest a difference in the feeding behaviour of the two nototheniid species, although both appear capable of feeding on common epibenthic invertebrates.

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