scholarly journals Spatial distribution of microzooplankton in different areas of the northern Antarctic Peninsula region, with an emphasis on tintinnids

Polar Biology ◽  
2021 ◽  
Author(s):  
Marina Monti-Birkenmeier ◽  
Tommaso Diociaiuti ◽  
Thomas H. Badewien ◽  
Anne-Christin Schulz ◽  
Anna Friedrichs ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Antarctic Peninsula ◽  
Sea Water ◽  
Late Summer ◽  
Taxonomic Composition ◽  
Deception Island ◽  
Marine Food Web ◽  
Key Species ◽  
Marine Food ◽  
Elephant Island

AbstractThe Western Antarctic Peninsula (WAP) is experiencing rapid climate warming, resulting in affecting the marine food web. To investigate the microzooplankton spatial distribution and to assess how climate change could affect the tintinnids community, sea water samples were collected during late summer 2018 at 19 stations in three different areas: Deception Island, Elephant Island and Antarctic Sound. The microzooplankton community comprised mainly tintinnids, aloricate ciliates, heterotrophic dinoflagellates and micrometazoans. Microzooplankton abundance varied between 3 and 109 ind. L−1 and biomass ranged from 0.009 to 2.55 µg C L−1. Significant differences in terms of abundance and taxonomic composition of microzooplankton were found among the three sampling areas. Deception Island area showed 44% of tintinnids and the rest were heterotrophic dinoflagellate, aloricate ciliates and micrometazoans. In Elephant Island and Antarctic Sound areas, tintinnids reached, respectively, 73% and 83% of the microzooplankton composition, with all the other groups varying between 20 and 30%. Tintinnids were the most representative group in the area, with the species Codonellopsis balechi, Codonellopsis glacialis, Cymatocylis convallaria and Cymatocylis drygalskii. The highest amounts of tintinnids were found at the surface and 100 m depth. The above mentioned species may be considered key species for the WAP and therefore they can be used to track environmental and hydrographical changes in the area. In late summer, microzooplankton presented low abundances and biomass, nevertheless they represented an important fraction of the planktonic community in the area.

Phytoplankton in the embayments of King George Island (Antarctic Peninsula): a review with emphasis on diatoms

Polar Record ◽  
2018 ◽  
Vol 54 (2) ◽  
pp. 158-175 ◽  
Author(s):  
Priscila Kienteca Lange ◽  
Ryszard Ligowski ◽  
Denise Rivera Tenenbaum
Keyword(s):  
Antarctic Peninsula ◽  
Early Summer ◽  
Western Antarctic Peninsula ◽  
King George Island ◽  
Accurate Identification ◽  
Phytoplankton Assemblages ◽  
Marine Food Web ◽  
Planktonic Diatoms ◽  
Local Material ◽  
Marine Food

ABSTRACTConsidering that phytoplankton assemblages are good bioindicators of environmental conditions, the sensitivity of the Western Antarctic Peninsula (WAP) to climate change, and the importance of some areas of its islands as Antarctic Specially Managed Areas, this work assembles published datasets on phytoplankton biodiversity and ecology in confined coastal areas (embayments) of King George Island, WAP. Over 33 years (1980–2013), 415 species from 122 genera have been identified to species level, being mostly diatoms (371 species), with 10 new species described with local material (6 diatoms, 4 cyanobacteria). The importance of diatoms was indicated by the frequent occurrence of Corethron pennatum, Pseudogomphonema kamtshaticum, and abundant benthic genera in the plankton (e.g. Navicula, Cocconeis). The increased contribution of dinoflagellates after 2010 suggests marked changes in the water column. Early-summer blooms differ between the bays' eastern and western shores, with terrestrial melting and wind-driven upwelling inducing the dominance of benthic species at eastern shores, whereas planktonic diatoms (Thalassiosira, Pseudo-nizschia, and Chaetoceros) are most abundant along western shores and central areas. The importance of an accurate identification of organisms that are becoming key ecological components of the region is discussed, as recent changes in the microflora may affect the entire marine food web.

Penguin eggshell membranes reflect homogeneity of mercury in the marine food web surrounding the Antarctic Peninsula

2012 ◽  
Vol 439 ◽  
pp. 165-171 ◽  
Author(s):  
Rebecka L. Brasso ◽  
Michael J. Polito ◽  
Heather J. Lynch ◽  
R. Naveen ◽  
Steven D. Emslie
Keyword(s):  
Food Web ◽  
Antarctic Peninsula ◽  
Marine Food Web ◽  
Marine Food ◽  
Eggshell Membranes ◽  
The Antarctic

Petroleum compounds in the marine food web: short-term experiments on the fate of naphthalene in Calanus

1976 ◽  
Vol 56 (1) ◽  
pp. 121-133 ◽  
Author(s):  
E. D. S. Corner ◽  
R. P. Harris ◽  
C. C. Kilvington ◽  
S. C. M. O'Hara
Keyword(s):  
Food Web ◽  
Adult Female ◽  
Sea Water ◽  
Short Term ◽  
Water Solutions ◽  
Marine Food Web ◽  
Feeding Experiments ◽  
Detectable Quantity ◽  
Marine Food ◽  
Calanus Helgolandicus

Adult female Calanus helgolandicus Claus immersed for 24 h in sea-water solutions of [1-14C]naphthalene accumulated a detectable quantity (3.6 pg/animal) from concentrations as low as 0.10 μg/1.Feeding experiments using barnacle nauplii or diatoms as foods showed that the dietary route of entry was more important quantitatively than direct uptake from solution in that in order to ensure that the same quantity of radioactivity in the animals was attained by the two routes the level of hydrocarbon in solution had always to be far greater than that present as paniculate food. Relevant to these observations was the further finding that after naphthalene had been accumulated directly from solution in sea water depuration was rapid and only a small fraction, less than 5%, of the original radioactivity could be detected after 10 days: by contrast, when the hydrocarbon was taken up by way of the food depuration was much slower, so that at the end of 10 days about a third of the original level of radioactivity still remained in the animals. Short-term experiments in which Calanus were fed on labelled diets for 24 h under bacteria-free conditions showed that at the end of this period over 90% of the radioactivity in the animals was present as unchanged naphthalene. However, more than two thirds of that released by the animals was in some form other than the hydrocarbon, a finding consistent with the view that Calanus is able to metabolize it.

scholarly journals Complexities of disturbance response in a marine food web

2021 ◽  
Author(s):  
Kristy A. Lewis ◽  
Robert R. Christian ◽  
Charles W. Martin ◽  
Kira L. Allen ◽  
Ashley M. McDonald ◽  
...  
Keyword(s):  
Food Web ◽  
Marine Food Web ◽  
Disturbance Response ◽  
Marine Food

The Role of Ammonites in the Mesozoic Marine Food Web Revealed by Jaw Preservation

Science ◽  
2011 ◽  
Vol 331 (6013) ◽  
pp. 70-72 ◽  
Author(s):  
I. Kruta ◽  
N. Landman ◽  
I. Rouget ◽  
F. Cecca ◽  
P. Tafforeau
Keyword(s):  
Food Web ◽  
Marine Food Web ◽  
Marine Food

Fate and processing of macroalgal wrack subsidies in beaches of Deception Island, Antarctic Peninsula

2014 ◽  
Vol 88 ◽  
pp. 1-10 ◽  
Author(s):  
M. Lastra ◽  
I.F. Rodil ◽  
A. Sánchez-Mata ◽  
M. García-Gallego ◽  
J. Mora
Keyword(s):  
Antarctic Peninsula ◽  
Deception Island

scholarly journals Inter-annual cascade effect on marine food web: A benthic pathway lagging nutrient supply to pelagic fish stock

PLoS ONE ◽  
2017 ◽  
Vol 12 (9) ◽  
pp. e0184512 ◽  
Author(s):  
Lohengrin Dias de Almeida Fernandes ◽  
Eduardo Barros Fagundes Netto ◽  
Ricardo Coutinho ◽  
Keyword(s):  
Food Web ◽  
Nutrient Supply ◽  
Pelagic Fish ◽  
Fish Stock ◽  
Marine Food Web ◽  
Cascade Effect ◽  
Marine Food

Trophic transfer of heavy metals in the marine food web based on tissue residuals

2021 ◽  
Vol 772 ◽  
pp. 145064
Author(s):  
Yongfei Gao ◽  
Ruyue Wang ◽  
Yanyu Li ◽  
Xuebin Ding ◽  
Yueming Jiang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Food Web ◽  
Trophic Transfer ◽  
Web Based ◽  
Marine Food Web ◽  
Marine Food

scholarly journals Hydrology and circulation in the North Aegean (eastern Mediterranean) throughout 1997 and 1998

2002 ◽  
Vol 3 (1) ◽  
pp. 5 ◽  
Author(s):  
V. ZERVAKIS ◽  
D. GEORGOPOULOS
Keyword(s):  
Surface Layer ◽  
Black Sea ◽  
Sea Water ◽  
Saline Water ◽  
Eastern Mediterranean ◽  
Late Summer ◽  
Cyclonic Circulation ◽  
The Black Sea ◽  
The North ◽  
North Aegean

The combination of two research projects offered us the opportunity to perform a comprehensive study of the seasonal evolution of the hydrological structure and the circulation of the North Aegean Sea, at the northern extremes of the eastern Mediterranean. The combination of brackish water inflow from the Dardanelles and the sea-bottom relief dictate the significant differences between the North and South Aegean water columns. The relatively warm and highly saline South Aegean waters enter the North Aegean through the dominant cyclonic circulation of the basin. In the North Aegean, three layers of distinct water masses of very different properties are observed: The 20-50 m thick surface layer is occupied mainly by Black Sea Water, modified on its way through the Bosphorus, the Sea of Marmara and the Dardanelles. Below the surface layer there is warm and highly saline water originating in the South Aegean and the Levantine, extending down to 350-400 m depth. Below this layer, the deeper-than-400 m basins of the North Aegean contain locally formed, very dense water with different θ /S characteristics at each subbasin. The circulation is characterised by a series of permanent, semi-permanent and transient mesoscale features, overlaid on the general slow cyclonic circulation of the Aegean. The mesoscale activity, while not necessarily important in enhancing isopycnal mixing in the region, in combination with the very high stratification of the upper layers, however, increases the residence time of the water of the upper layers in the general area of the North Aegean. As a result, water having out-flowed from the Black Sea in the winter, forms a separate distinct layer in the region in spring (lying between “younger” BSW and the Levantine origin water), and is still traceable in the water column in late summer.

Sign in / Sign up

Export Citation Format

Share Document