Phenotypic plasticity in the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands

Polar Biology ◽  
2009 ◽  
Vol 32 (10) ◽  
pp. 1407-1413 ◽  
Author(s):  
Gabriela L. M. Piacentino ◽  
Esteban Barrera-Oro
2004 ◽  
Vol 16 (3) ◽  
pp. 339-344 ◽  
Author(s):  
BRENDA L. HALL ◽  
ETHAN R. PERRY

Raised beach ridges on Livingston Island of the South Shetland Islands display variations in both quantity and source of ice rafted detritus (IRD) received over time. Whereas the modern beach exhibits little IRD, all of which is of local origin, the next highest beach (∼250 14C yr BP) has large amounts, some of which comes from as far away as the Antarctic Peninsula. Significant quantities of IRD also were deposited ∼1750 14C yr BP. Both time periods coincide with generally cooler regional conditions and, at least in the case of the ∼250 yr old beach, local glacial advance. We suggest that the increases in ice rafting may reflect periods of greater glacial activity, altered ocean circulation, and/or greater iceberg preservation during the late Holocene. Limited IRD and lack of far-travelled erratics on the modern beach are both consistent with the ongoing warming trend in the Antarctic Peninsula region.


Phytotaxa ◽  
2016 ◽  
Vol 272 (1) ◽  
pp. 37 ◽  
Author(s):  
RALITSA ZIDAROVA ◽  
KATEŘINA KOPALOVÁ ◽  
BART VAN DE VIJVER

The present paper describes 10 new diatom (Bacillariophyta) species from the Maritime Antarctic Region. Five of the newly described taxa: Caloneis australis sp. nov., Mayamaea sweetloveana sp. nov., Navicula romanedwardii sp. nov., Sellaphora antarctica sp. nov. and Sellaphora gracillima sp. nov. have been previously reported from the Antarctic Region but were force-fitted into incorrect names. Five other taxa: Chamaepinnularia elliptica sp. nov., Cosmioneis regigeorgiensis sp. nov., Mayamaea tytgatiana sp. nov., Muelleria pimpireviana sp. nov. and Pinnularia pinseeliana sp. nov. are newly discovered taxa. The morphology of all new species is studied using both light and scanning electon microscope observations and compared with similar species from the Antarctic Region and worldwide. Data about the ecology and confirmed Antarctic distribution of the new species are added.


Polar Record ◽  
2015 ◽  
Vol 51 (6) ◽  
pp. 644-654 ◽  
Author(s):  
Rip Bulkeley

ABSTRACTThe celebrated meeting between Captain Bellingshausen of the Imperial Russian Navy and the American sealing skipper Nathaniel Brown Palmer, off the South Shetland Islands in February 1821, has often been described by following just one or other of the two men's divergent and in some respects irreconcilable accounts. The most contentious issue is whether or not Palmer told Bellingshausen about the existence of a body of land to the south of the South Shetlands, known today as the Antarctic Peninsula. This note attempts to reach a balanced assessment of the matter by examining evidence from both sides, including several previously unconsidered items. It concludes that, although the truth will never be known with absolute certainty, the basic American account is more plausible, by the narrowest of narrow margins, than the Russian.


Polar Biology ◽  
2016 ◽  
Vol 40 (3) ◽  
pp. 649-658 ◽  
Author(s):  
Evelin Troncoso ◽  
Salvador Barahona ◽  
Mario Carrasco ◽  
Pablo Villarreal ◽  
Jennifer Alcaíno ◽  
...  

2018 ◽  
Vol 87 (4) ◽  
Author(s):  
Mariusz Wierzgoń ◽  
Tomasz Suchan ◽  
Michał Ronikier

<em>Tortella fragilis</em> (Drumm.) Limpr. (Pottiaceae) and <em>Bryum nivale</em> Müll. Hal. (Bryaceae) are recorded for the first time from the South Shetland Islands in the northern maritime Antarctic. They were discovered in the Admiralty Bay area on King George Island, the largest island of this archipelago. The two species are briefly characterized morphologically, their habitats are described, and their distribution in the Antarctic is mapped. Discovery of these species has increased the documented moss flora of King George Island to 67 species, strengthening it in the leading position among individual areas with the richest diversity of moss flora in Antarctica. Likewise, <em>T. fragilis</em> and <em>B. nivale</em> represent remarkable additions to the moss flora of the South Shetland Islands, which currently consists of 92 species and one variety, making this archipelago by far the richest bryofloristically amongst large geographic regions of the Antarctic. Comparison of recent (2018) and old (1985) photographs revealed a significant retreat of glacial cover and suggests that the collection site was likely opened for colonization only within the last several decades. The record of <em>T. fragilis</em> is biogeographically relevant, and constitutes an intermediate site between the species’ occurrences in the Antarctic Peninsula and southern South America. The present record of <em>B. nivale</em> is the fourth discovery of the species worldwide, which may be helpful for the future designation of the distribution of this extremely rare species.


Polar Record ◽  
1950 ◽  
Vol 5 (40) ◽  
pp. 565-575

[The South Shetland Islands were first sighted in February 1819 by William Smith, master and part-owner of the brig Williams of Blyth, and resighted in October of that year, when Smith landed and claimed the territory for the British Crown. On his arrival at Valparaiso, he and his ship were taken over by the British naval authorities and sent back in December 1819 with Edward Bransfield, Master, R.N., and a small naval staff to survey the new territory. During their absence on this duty, an account of the discovery by John Miers and a sketchmap signed by “Henry Foster, Midn H.M.S. Creole”, both dated January 1820, were sent home. The former was published in the Edinburgh Philosophical Journal, Vol. 3, No. 6, 1820, p. 367–80, and the latter is preserved among the original documents of the Hydrographic Department of the Admiralty (Press mark S 90/3 Ael).John Miers (1789–1879) was an English engineer who had gone out to Valparaiso in 1819 at the invitation of Lord Cochrane, then commanding the Chilean Navy, to help in developing that country's mineral resources. He was installing a plant at Conc6n for rolling copper plate for sheathing vessels, and had contracted with Smith for the transport of mining machinery from Valparaiso to Concón in the Williams, when Captain Sheriff, the Senior British Naval Officer at Valparaiso, decided to charter the Williams and to send Bransfield to the Antarctic.


1991 ◽  
Vol 3 (1) ◽  
pp. 53-59 ◽  
Author(s):  
L.B. Minto ◽  
G.J. Shepherd ◽  
M.B. Usher

Halozetes belgicae is distributed widely in the Subantarctic and maritime Antarctic, with subspecies described from Macquarie Island and the South Sandwich Islands. A morphometrical study, based largely on the development of the setae, indicates that the nominate subspecies is confined to the Antarctic Peninsula and its offshore islands (including the South Shetland Islands), whilst specimens from the South Orkney Islands are probably consubspecific with individuals on the South Sandwich Islands. In comparison with other studies of the Acari, the results strengthen the case for the recognition of a South Orkadian biogeographical zone.


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