Records of Boeckella poppei (Mrazek, 1901) (Calanoida: Centropagidae) obtained during Ukrainian Antarctic Expeditions DOI Creative Commons
M. Nabokin, O. Salganskiy, Вікторія Ткаченко

et al.

Ukrainian Antarctic Journal, Journal Year: 2023, Volume and Issue: 21(1), P. 55 - 65

Published: Jan. 1, 2023

The copepod Boeckella poppei (Mrazek, 1901) (Calanoida: Centropagidae) is one of the Maritime Antarctic's most common freshwater zooplankton species. It was first discovered in 1961–1962 on Signy Island (South Orkney Islands). Nowadays, it found many other islands region. also Western Subantarctic islands, eastern part continent, and South America. However, Wilhelm Archipelago, there have been only a few disjointed findings species so far: has noted as numerous both north south Ukrainian Antarctic Akademik Vernadsky station, yet for thearchipelago, are two brief records which do not describe its distribution this Our data based 114 specimens collected 2005–2023 during Expeditions. 51 samples from 23 lakes eight islands: Uruguay, Irizar, Berthelot, Galindez, Roca, Eight (Wilhelm Archipelago), Nelson, King George Shetland Live were recorded ice-free period significantly after surface frozen. In samples, adults copepodid stages found, while nauplii found.

Language: Английский

Ancient diversification in extreme environments: exploring the historical biogeography of the Antarctic winged midge Parochlus steinenii (Diptera: Chironomidae) DOI Creative Commons
Claudia S. Maturana, Tamara Contador, Felipe Lorenz Simões

et al.

Frontiers in Ecology and Evolution, Journal Year: 2024, Volume and Issue: 12

Published: July 11, 2024

The terrestrial fauna of Antarctica consists a limited number species, notably insects, small crustaceans and other micro-invertebrates. Over long periods evolutionary isolation, these organisms have developed varying degrees tolerance to multifaceted environmental stresses. Recent molecular biogeographical research highlights the enduring persistence much Antarctica’s current fauna, with estimates spanning from hundreds thousands millions years. Parochlus steinenii , commonly known as Antarctic winged midge, stands out one only two insect species native Antarctica. Distributed across three biogeographic regions, southern South America Falkland/Malvinas Islands, sub-Antarctic Georgia Maritime Shetland this midge raises questions about temporal isolation its populations their divergence. Employing mitochondrial nuclear genetic markers, we conducted phylogeographic demographic analyses on 151 individuals P. obtained main regions including Magellanic Ecoregion (MSE) America, Island (SG) Islands (SSI) within (MA). Our data support diversification during mid-Pleistocene around 1.46 Mya. This period included branching event between clade containing specimens MSE broader range locations SSI SG. Based intraspecific inferences, detected strong divergence regions. We also signal population growth deglaciation process in SG, contrary pattern seen MSE. different histories sampled could result MA SG experiencing bottleneck due reduction size Last Glacial Maximum, while maintained significant effective size. high level remaining supports hypothesis speciation taking place .

Language: Английский

Citations

1
Polar-Region Soils as Novel Reservoir of Lactic Acid Bacteria from the Genus Carnobacterium DOI Open Access
Katarzyna Kosiorek, Jakub Grzesiak, Jan Gawor

et al.

International Journal of Molecular Sciences, Journal Year: 2024, Volume and Issue: 25(17), P. 9444 - 9444

Published: Aug. 30, 2024

Polar habitats offer excellent sites to isolate unique bacterial strains due their diverse physical, geochemical, and biological factors. We hypothesize that the environmental conditions of polar regions select for distinct lactic acid bacteria (LAB) with novel biochemical properties. In this study, we characterized ten psychrotrophic LAB isolated from hitherto poorly described sources—High Arctic maritime Antarctic soils soil-like materials, including ornithogenic soils, cryoconites, elephant seal colonies, postglacial moraines. evaluated physiological properties isolates. Based on 16S rRNA housekeeping genes, four were assigned three Carnobacterium species: C. alterfunditum, maltaromaticum, jeotgali. The remaining may represent new species genus. All isolates neutrophilic halophilic psychrotrophs capable fermenting various carbohydrates, organic acids, alcohols. identified metabolic suggest possible syntrophic interactions other microorganisms in habitats. Some showed antimicrobial activity against food pathogens such as Listeria monocytogenes human like Staphylococcus spp. Several exhibited traits potential biotechnological applications could be more effectively exploited under less stringent technological compared thermophilic strains, lower temperatures reduced nutrient concentrations. Analysis extrachromosomal genetic elements revealed 13 plasmids ranging 4.5 79.5 kb five isolates, featuring structures high levels previously uncharacterized genes. This work is first comprehensive study both known enhances our understanding communities harsh highly selective soil ecosystems.

Language: Английский

Citations

1
Community Analysis Reveals Biogeographical Patterns and Biodiversity Shortfalls in Antarctic Tardigrades DOI Creative Commons
Matteo Vecchi, Sara Brandoli, V. Trokhymets

et al.

Journal of Biogeography, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 13, 2024

ABSTRACT Aim Tardigrades are important members of Antarctic metazoan communities with many endemic species. Major biogeographic patterns fauna have been identified, in particular regarding the zonation across Gressitt line, dividing Continental and Peninsular Antarctica. Evidences suggest that tardigrades follow this too, but has never rigorously tested. Location Limnoterrestrial ecosystems Time Period 1950 to Present. Taxa Studied Tardigrades. Methods Records from Antarctica were collected their taxonomy coordinates harmonised. Alpha Beta diversity measures calculated compared different areas, line. Analyses repeated at spatial scales ensure robustness. Results both terms alpha beta consistent analyses scales. richness was higher Peninsula Sampling effort had a substantial effect on measured richness. Despite having significant effect, line side areas explained low amount variance. Main Conclusions The presence Tardigrade composition is supported, geographical structure present also smaller This geographic structuring suggests local endemisms calls for attention eventual effects climate change communities. Faunistic data still far being exhaustive Linnean Wallacean biodiversity shortfalls two most immediate issues be solved more reliable estimation true biodiversity.

Language: Английский

Citations

0
Records of Boeckella poppei (Mrazek, 1901) (Calanoida: Centropagidae) obtained during Ukrainian Antarctic Expeditions DOI Creative Commons
M. Nabokin, O. Salganskiy, Вікторія Ткаченко

et al.

Ukrainian Antarctic Journal, Journal Year: 2023, Volume and Issue: 21(1), P. 55 - 65

Published: Jan. 1, 2023

The copepod Boeckella poppei (Mrazek, 1901) (Calanoida: Centropagidae) is one of the Maritime Antarctic's most common freshwater zooplankton species. It was first discovered in 1961–1962 on Signy Island (South Orkney Islands). Nowadays, it found many other islands region. also Western Subantarctic islands, eastern part continent, and South America. However, Wilhelm Archipelago, there have been only a few disjointed findings species so far: has noted as numerous both north south Ukrainian Antarctic Akademik Vernadsky station, yet for thearchipelago, are two brief records which do not describe its distribution this Our data based 114 specimens collected 2005–2023 during Expeditions. 51 samples from 23 lakes eight islands: Uruguay, Irizar, Berthelot, Galindez, Roca, Eight (Wilhelm Archipelago), Nelson, King George Shetland Live were recorded ice-free period significantly after surface frozen. In samples, adults copepodid stages found, while nauplii found.

Language: Английский

Citations

0