Freshwater diatoms from Pleistocene-Holocene sediments in Bunger Oasis (East Antarctica)

2019 ◽  
pp. 233-2363
Author(s):  
Mark A. Mustafin ◽  
Zinaida V. Pushina ◽  
Andrey S. Biryukov
Keyword(s):  
Shallow Lake ◽  
High Salinity ◽  
East Antarctica ◽  
Diatom Assemblage ◽  
Freshwater Lakes ◽  
Quaternary Sediments ◽  
Holocene Sediments ◽  
Freshwater Diatoms ◽  
Western Shore ◽  
Freshwater Diatom

The monodominant freshwater diatom assemblage was in first established in Quaternary sediments at an altitude of 24 m in the outcrop on the western shore of the Rybiy Khvost Bay in the Bunger Oasis (East Antarctica). The diatom assemblage is dominated by the benthic Navicula shackletoni, characteristic of hypersaline lakes.The diatom assemblage reflects the conditions for the formation of deposits in a shallow lake with high salinity. This diatom assemblage differs from the previously established diatom associations in the Holocene sediments of the freshwater lakes of the Bunger Oasis.

scholarly journals The structure and diversity of freshwater diatom assemblages from Franz Josef Land Archipelago: a northern outpost for freshwater diatoms

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e1705 ◽  
Author(s):  
Sergi Pla-Rabés ◽  
Paul B. Hamilton ◽  
Enric Ballesteros ◽  
Maria Gavrilo ◽  
Alan M. Friedlander ◽  
...  
Keyword(s):  
Seasonal Changes ◽  
Ph Gradient ◽  
Diatom Assemblages ◽  
Diatom Flora ◽  
Human Footprint ◽  
Franz Josef Land ◽  
Freshwater Diatoms ◽  
Arctic Conditions ◽  
Cell Densities ◽  
Freshwater Diatom

We examined diatom assemblages from 18 stream and pond samples in the Franz Josef Land Archipelago (FJL), the most northern land of Eurasia. More than 216 taxa were observed, revealing a rich circumpolar diatom flora, including many undescribed taxa. Widely distributed taxa were the most abundant by cell densities, while circumpolar taxa were the most species rich. Stream and pond habitats hosted different assemblages, and varied along a pH gradient.Diatoma tenuiswas the most abundant and ubiquitous taxon. However, several circumpolar taxa such asChamaepinnularia gandrupii, Cymbella botellus, Psammothidiumsp. andHumidophila laevissimawere also found in relatively high abundances. Aerophilic taxa were an important component of FJL diatom assemblages (Humidophilaspp.,Caloneisspp. andPinnulariaspp.), reflecting the large and extreme seasonal changes in Arctic conditions. We predict a decrease in the abundance of circumpolar taxa, an increase in local (α-) freshwater diatom diversity, but a decrease in regional diversity (circumpolar homogenization) as a result of current warming trends and to a lesser extent the increasing human footprint in the region.

Phytoplankton blooms under dim and cold conditions in freshwater lakes of East Antarctica

Polar Biology ◽  
2007 ◽  
Vol 31 (2) ◽  
pp. 199-208 ◽  
Author(s):  
Yukiko Tanabe ◽  
Sakae Kudoh ◽  
Satoshi Imura ◽  
Mitsuo Fukuchi
Keyword(s):  
East Antarctica ◽  
Freshwater Lakes ◽  
Phytoplankton Blooms

scholarly journals Brief communication: Impacts of a developing polynya off Commonwealth Bay, East Antarctica, triggered by grounding of iceberg B09B

2016 ◽  
Vol 10 (6) ◽  
pp. 2603-2609 ◽  
Author(s):  
Christopher J. Fogwill ◽  
Erik van Sebille ◽  
Eva A. Cougnon ◽  
Chris S. M. Turney ◽  
Steve R. Rintoul ◽  
...  
Keyword(s):  
Ocean Circulation ◽  
Large Scale ◽  
Bottom Water ◽  
High Salinity ◽  
Satellite Observations ◽  
East Antarctica ◽  
Shelf Water ◽  
Antarctic Bottom Water ◽  
Glacier Tongue

Abstract. The dramatic calving of the Mertz Glacier tongue in 2010, precipitated by the movement of iceberg B09B, reshaped the oceanographic regime across the Mertz Polynya and Commonwealth Bay, regions where high-salinity shelf water (HSSW) – the precursor to Antarctic bottom water (AABW) – is formed. Here we present post-calving observations that suggest that this reconfiguration and subsequent grounding of B09B have driven the development of a new polynya and associated HSSW production off Commonwealth Bay. Supported by satellite observations and modelling, our findings demonstrate how local icescape changes may impact the formation of HSSW, with potential implications for large-scale ocean circulation.

An analysis of the limnology and sedimentary diatom flora of fourteen lakes and ponds from the Windmill Islands, East Antarctica

2001 ◽  
Vol 13 (4) ◽  
pp. 410-419 ◽  
Author(s):  
D. Roberts ◽  
A. McMinn ◽  
N. Johnston ◽  
D.B. Gore ◽  
M. Melles ◽  
...  
Keyword(s):  
Water Chemistry ◽  
Saline Lakes ◽  
East Antarctica ◽  
Freshwater Lakes ◽  
Diatom Flora ◽  
Larsemann Hills ◽  
Freshwater Ponds ◽  
Windmill Islands ◽  
Vestfold Hills ◽  
Floral Assemblage

The limnology and sedimentary diatom flora of fourteen lakes and ponds from the Windmill Islands, East Antarctica, is presented. Saline lakes, saline ponds and freshwater ponds are represented in this dataset. The Windmill Island lake diatom flora represents an intermediate floral assemblage between that of the freshwater lakes of the Larsemann Hills and the saline lakes of Vestfold Hills, East Antarctica. Variations within this assemblage are related to water chemistry variables in the Windmill Island lakes. In particular, a lakewater salinity/phosphate gradient can explain the variation observed in the sedimentary diatom flora of the lakes and ponds included in this study.

scholarly journals Evidence from checklists for a Holarctic (circumboreal) kingdom of diatoms

PhytoKeys ◽  
2018 ◽  
Vol 108 ◽  
pp. 13-24 ◽  
Author(s):  
Loren Bahls
Keyword(s):  
Great Lakes ◽  
Polar Region ◽  
High Salinity ◽  
Flowering Plants ◽  
Laurentian Great Lakes ◽  
Inland Waters ◽  
The South ◽  
Cosmopolitan Species ◽  
Freshwater Diatoms ◽  
South Polar

Published checklists of freshwater diatoms that represent the American Northwest, Laurentian Great Lakes, Germany and the South Polar Region were compared systematically and the numbers of taxa shared by two or more of these regions were noted. There is a higher level of floristic correspondence between the American Northwest and Germany (71%) and between the American Northwest and the Laurentian Great Lakes (64%) than between the American Northwest and the South Polar Region (45%). These findings support a Holarctic Kingdom of diatoms that is parallel to the Holarctic Kingdom of flowering plants. Mountains and coastal areas and/or inland waters of high salinity may explain why the American Northwest and Germany have more taxa in common than the American Northwest and the Laurentian Great Lakes. Common riverine diatom taxa in the American Northwest are similar to those reported from nationwide monitoring stations. The number of truly cosmopolitan species – those found on all continents – is probably less than 300. The terms “cosmopolitan”, “endemic” and “native” are often misused when applied to diatoms and the first two terms always need to be qualified.

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