Particle Fluxes and Sediment Characteristics at Three Selected Sites in the Ross Sea (Antarctica)

1999 ◽  
pp. 209-222 ◽  
Author(s):  
M. Ravaioli ◽  
M. Frignani ◽  
M. C. Gambi ◽  
L. Labbrozzi ◽  
L. Langone
Keyword(s):  
Ross Sea ◽  
Sediment Characteristics ◽  
Particle Fluxes

Biological components of Ross Sea short-term particle fluxes in the austral summer of 1995–1996

2001 ◽  
Vol 48 (12) ◽  
pp. 2645-2671 ◽  
Author(s):  
Marcia M. Gowing ◽  
David L. Garrison ◽  
Holly B. Kunze ◽  
Christopher J. Winchell
Keyword(s):  
Ross Sea ◽  
Austral Summer ◽  
Short Term ◽  
Particle Fluxes

Macrobenthic communities of the north-western Ross Sea shelf: links to depth, sediment characteristics and latitude

2010 ◽  
Vol 22 (6) ◽  
pp. 793-804 ◽  
Author(s):  
V.J. Cummings ◽  
S.F. Thrush ◽  
M. Chiantore ◽  
J.E. Hewitt ◽  
R. Cattaneo-Vietti
Keyword(s):  
Ross Sea ◽  
Fine Sand ◽  
Sediment Characteristics ◽  
Explanatory Variables ◽  
The North ◽  
Biogenic Habitat ◽  
Community Variability ◽  
North Western ◽  
Western Ross Sea ◽  
Ross Sea Shelf

AbstractIn early 2004 the Victoria Land Transect project sampled coastal north-western Ross Sea shelf benthos at Cape Adare, Cape Hallett, Cape Russell and Coulman Island from 100–500 m deep. We describe the benthic macrofaunal assemblages at these locations and, to assess the use of seafloor sediment characteristics and/or depth measures in bioregionalizations, determine the extent to which assemblage compositions are related to measured differences in these factors. Percentages of fine sand and silt, the ratio of sediment chlorophyllato phaeophytin, and depth were identified as important explanatory variables, but in combination they explained only 17.3% of between-location differences in assemblages. Consequently, these variables are clearly not strong determinants of macrofaunal assemblage structure. Latitudeper sewas not a useful measure of community variability and change. A significant correlation between both number of individuals and number of taxa and sediment phaeophytin concentration across locations suggests that the distribution of the benthos reflects their response to seafloor productivity. A number of factors not measured in this study have probably influenced the structure and function of assemblages and habitats. We discuss the implications of the results to marine classifications, and stress the need to incorporate biogenic habitat complexity into protection strategies.

Particle fluxes and biogeochemical processes in an area influenced by seasonal retreat of the ice margin (northwestern Ross Sea, Antarctica)

2000 ◽  
Vol 27 (1-3) ◽  
pp. 221-234 ◽  
Author(s):  
Leonardo Langone ◽  
Mauro Frignani ◽  
Mariangela Ravaioli ◽  
Cristina Bianchi
Keyword(s):  
Ross Sea ◽  
Biogeochemical Processes ◽  
Particle Fluxes

Long time-series of export fluxes in the western Ross Sea (Antarctica)

2020 ◽  
Author(s):  
Patrizia Giordano ◽  
Federico Giglio ◽  
Mariangela Ravaioli ◽  
Marco Capello ◽  
Laura Cutroneo ◽  
...  
Keyword(s):  
Time Series ◽  
Sea Ice ◽  
Primary Production ◽  
Ross Sea ◽  
Late Summer ◽  
Sediment Traps ◽  
Sea Ice Extent ◽  
Particle Fluxes ◽  
Over Time ◽  
Western Ross Sea

<p>The export of particulate organic carbon (POC) from the sea surface is an essential part of the biological pump. Export fluxes are the result of what is produced in surface water and how much is consumed during particle sinking in the water column. In the Ross Sea, fluxes of POC and total mass are well correlated implying that particle fluxes are dominated by biogenic debris.</p><p>Here, we report new and reference data of vertical particle fluxes to below the productive layer obtained on decadal time scales (1990-2017) by automatic sediment traps tethered to moorings in the western Ross Sea (Antarctica). Compilation of all data available in the Ross Sea (23 sites, >1000 samples) shows that annual POC fluxes to below 200 m average 4.4±3.3 g C m<sup>-2</sup>  y<sup>-1</sup>. Particle fluxes are relatively low when primary production is high (spring-summer) followed by enhanced sedimentation in late summer-fall. The high degree of decoupling between production and sedimentation is unusual compared to records of Antarctic Peninsula and may represent low grazing rates. Furthermore, data exhibit a large interannual variability and a decreasing trend over time, with a clear shift after 2000. Do the reduced export fluxes depend on lower biological production, enhanced OM consumption, or other processes (e.g., lateral transfer of biogenic particles outside the study area)?</p><p>Satellite observations allow us to reconstruct the seasonal and interannual change of chlorophyll biomass, and sea ice extent and duration. Water temperature recorded at mid-depth is used to monitor the different intrusion over time of CDW, the main driver of temporal variability of Fe supply for the Ross Sea. Time series of particle fluxes, chlorophyll, sea ice cover and mid-depth temperature will be compared in order to test if the recent reduction of downward particle fluxes depend on primary production changes.</p>

scholarly journals Interannual variability of vertical particle fluxes in the Ross Sea (Antarctica)

2019 ◽  
Vol 34 ◽  
pp. 417-440
Author(s):  
Francesca Chiarini ◽  
Mariangela Ravaioli ◽  
Lucilla Capotondi
Keyword(s):  
Organic Carbon ◽  
Biogenic Silica ◽  
Ross Sea ◽  
Research Network ◽  
High Mass ◽  
Sea Ice Extent ◽  
Carbon Cycles ◽  
Mass Fluxes ◽  
Long Term Ecological Research ◽  
Particle Fluxes

This study presents new data on biogenic and terrigenous particle fluxes collected by an oceanographic mooring (Mooring A) deployed in the south-western Ross Sea (Antarctica) in the frame of the Italian Long-Term Ecological Research network (LTER-Italy). Results from the years 2005 and 2008 document high mass fluxes during the summer and early autumn seasons, not coincident with the algal bloom. Downward particle fluxes exhibit a high inter-annual variability of both particulate fluxes and composition that seem related to the different factors as the phytoplankton increases, occurring between the beginning of February and the end of March, to the variations in the sea ice extent and to the resuspension and/or lateral advection processes. The flux variability may have been influenced by Iceberg B-15 that resided in the investigated area between 2000 and 2005. The decoupling of biogenic silica and organic carbon cycles is documented by differences in the rates of their respective key processes: biogenic silica dissolution and organic carbon degradation.

Inter-individual differences in the foraging behavior of breeding Adélie penguins are driven by individual quality and sex

2020 ◽  
Vol 636 ◽  
pp. 189-205
Author(s):  
A Lescroël ◽  
PO’B Lyver ◽  
D Jongsomjit ◽  
S Veloz ◽  
KM Dugger ◽  
...  
Keyword(s):  
Individual Differences ◽  
Foraging Behavior ◽  
Ross Sea ◽  
Individual Quality ◽  
High Quality ◽  
Breeding Experience ◽  
Age Related ◽  
Demographic Traits ◽  
Iteroparous Species ◽  
Adélie Penguins

Inter-individual differences in demographic traits of iteroparous species can arise through learning and maturation, as well as from permanent differences in individual ‘quality’ and sex-specific constraints. As the ability to acquire energy determines the resources an individual can allocate to reproduction and self-maintenance, foraging behavior is a key trait to study to better understand the mechanisms underlying these differences. So far, most seabird studies have focused on the effect of maturation and learning processes on foraging performance, while only a few have included measures of individual quality. Here, we investigated the effects of age, breeding experience, sex, and individual breeding quality on the foraging behavior and location of 83 known-age Adélie penguins at Cape Bird, Ross Sea, Antarctica. Over a 2 yr period, we showed that (1) high-quality birds dived deeper than lower quality ones, apparently catching a higher number of prey per dive and targeting different foraging locations; (2) females performed longer foraging trips and a higher number of dives compared to males; (3) there were no significant age-related differences in foraging behavior; and (4) breeding experience had a weak influence on foraging behavior. We suggest that high-quality individuals have higher physiological ability, enabling them to dive deeper and forage more effectively. Further inquiry should focus on determining the physiological differences among penguins of different quality.

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