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21 results for “South Shetland Islands”
Fig. 2 in Comparative analysis of the diet of Arctocephalus gazella (Pinnipedia), at two localities of the South Shetland Islands, with emphasis on the fish component
Fig. 2. Estimated standard length frequency distribution of Gymnoscopelus nicholsi (Gilbert, 1911), preyed on by Antarctic fur seals Arctocephalus gazella (Peters, 1875), at Stranger Point and Duthoit Point, South Shetland Islands, in February 2012.
Fig. 1 in Comparative analysis of the diet of Arctocephalus gazella (Pinnipedia), at two localities of the South Shetland Islands, with emphasis on the fish component
Fig. 1. The study area at South Shetland Islands: Stranger Point, King George Island/Isla 25 de Mayo and Duthoit Point, Nelson Island (modified from MALVÉ et al., 2014 and BRAUN et al., 2017).
Fig. 4 in Comparative analysis of the diet of Arctocephalus gazella (Pinnipedia), at two localities of the South Shetland Islands, with emphasis on the fish component
Fig. 4. Estimated standard length frequency distribution of Electrona antarctica (Gunther, 1878) preyed on by Arctocephalus gazella (Peters, 1875), at both sampling sites, Stranger Point and Duthoit Point, South Shetland Islands, in February 2012.
Fig. 3 in Comparative analysis of the diet of Arctocephalus gazella (Pinnipedia), at two localities of the South Shetland Islands, with emphasis on the fish component
Fig. 3. Estimated standard length frequency distribution of Pleuragramma antarctica (Boulenger, 1902) preyed on by Arctocephalus gazella (Peters, 1875), at both sampling sites, Stranger Point and Duthoit Point, South Shetland Islands, in February 2012.
Supplementary Material: Thermal resetting of the Early Cretaceous volcanic rocks of Low Island, South Shetland Islands, Antarctica
<p>Supplementary material comprising the geochronological and petrographic data compilation used for the above-titled paper submitted to <em>Andean Geology</em> (Bastias-Silva et al., 2024). The Ar/Ar data presented here was obtained at the University of Geneva in 2016. During the preparation of this article and the subsequent revisions required for publication, these ages were recalculated, leading to minor differences between the original source file and the data presented in the manuscript. This dataset includes new, unpublished data, which is discussed in the associated publication.</p> <p>Bastias-Silva et al. 2024. Thermal resetting of the Early Cretaceous volcanic rocks of Low Island, South Shetland Islands, Antarctica. Andean Geology</p>
Figures 7-12 in Synthesis Of The Bulgarian Protozoological Investigations Of South Shetland Islands (The Antarctic)
Figures 7-12. Scanning electron photographs of some common interstitial testate amoebae, found in subantarctic region of Chile and on Livingston Island. 7 – Centropyxiella arenaria; 8 – Ogdeniella elegans; 9 – Psammonobiotus linearis; 10 – Pseudocorythion acutum; 11 - Corythionella minima; 12 – Chardezia caudata.
Data from: Where are the beachmasters? Unexpectedly weak polygyny among southern elephant seals on a South Shetland Island
<p><strong>Abstract</strong></p> <p>Intraspecific variation in animal mating systems can have important implications for ecological, evolutionary and demographic processes in wild populations. For example, patterns of mating can impact social structure, dispersal, effective population size and inbreeding. However, few species have been studied in sufficient detail to elucidate mating system plasticity and its dependence on ecological and demographic factors. Southern elephant seals (Mirounga leonina) have long been regarded as a textbook example of a polygynous mating system, with dominant ‘beachmaster’ males controlling harems of up to several hundred females. However, behavioural and genetic studies have uncovered appreciable geographic variation in the strength of polygyny among elephant seal populations. We therefore used molecular parentage analysis to investigate patterns of parentage in a small satellite colony of elephant seals at the South Shetland Islands. We hypothesised that dominant males would be able to successfully monopolise the relatively small numbers of females present in the colony, leading to relatively high levels of polygyny. A total of 424 individuals (comprising 33 adult males, 101 adult females and 290 pups) sampled over eight years were genotyped at 20 microsatellites and reproductive success was analysed by genetically assigning parents. Paternity could only be assigned to 31 pups (10.7%), despite our panel of genetic markers being highly informative and the genotyping error rate being very low. The strength of inferred polygyny was weak in comparison to previous genetic studies of the same species, with the most successful male fathering only seven pups over the entire course of the study. Our results show that, even in a species long regarded as a model for extreme polygyny, male reproductive skew can vary substantially among populations.</p>
FIGURES 136–156 in Ten new Bacillariophyta species from James Ross Island and the South Shetland Islands (Maritime Antarctic Region)
FIGURES 136–156. Sellaphora antarctica sp. nov. LM and part of the SEM pictures taken from the holotype population (sample BYM051) from Livingston Island (South Shetland Islands). 136–153. LM views of 18 valves from the type population. Figs 152–153 represent girdle view. 154. SEM of an entire valve, external view (picture taken from James Ross Island, sample JRI-004). 155. SEM of the valve exterior, showing the mantle and girdle. 156. SEM of an entire valve, internal view (picture taken from James Ross Island, sample JRI-11). Arrow indicates the shallow depression present at each apex. Scale bar represents 10 μm except for fig. 154 where scale bar = 5 μm and figs 155 and 156 where scale bar = 2 μm.
FIGURES 59–80 in Ten new Bacillariophyta species from James Ross Island and the South Shetland Islands (Maritime Antarctic Region)
FIGURES 59–80. Mayamaea tytgatiana sp. nov. LM & SEM pictures taken from the holotype population (sample D37) from Deception Island (South Shetland Islands). 59–76. LM views of 18 valves from the type population. Fig. 76 shows the girdle view. 77. SEM of an entire valve, external view. 78. SEM detail of the valve externally, showing the enlarged central raphe endings and rounded areolae with external hymenes. 79. SEM view of the valve mantle with the slit-like areolae (arrows) and the hooked, elongated distal raphe endings. 80. SEM of an entire valve, internal view. Scale bar represents 10 μm except for fig. 78 where scale bar = 1 μm and fig. 79 where scale bar = 2 μm.
FIGURES 35–45 in Ten new Bacillariophyta species from James Ross Island and the South Shetland Islands (Maritime Antarctic Region)
FIGURES 35–45. Cosmioneis regigeorgiensis sp. nov. LM & SEM pictures taken from the holotype population (sample KGI9) from King George Island, South Shetland Islands. 35–42. LM views of 8 valves from the type population. Fig. 35 shows the girdle view. 43. SEM view of the mantle and girdle bands. 44. SEM of an entire valve, external view. 45. SEM of an entire valve, internal view. Scale bar represents 10 μm.
FIGURES 119–135 in Ten new Bacillariophyta species from James Ross Island and the South Shetland Islands (Maritime Antarctic Region)
FIGURES 119–135. Pinnularia pinseeliana sp. nov. LM & SEM pictures taken from the holotype population (sample CC2) from Deception Island (South Shetland Islands).119–131. LM views of 13 valves from the type population. Fig. 119 shows the girdle view. 132. SEM of an entire valve, external view. 133. SEM detail of the valve externally, showing the alveoli of the striae. 134. SEM of entire valve, internal view. 135. SEM detail of the valve interior. Arrows showing the elevated siliceous outgrowths on the virgae. Scale bar represents 10 μm except for figs 133 and 135 where scale bar = 1 μm.
FIGURES 92–118 in Ten new Bacillariophyta species from James Ross Island and the South Shetland Islands (Maritime Antarctic Region)
FIGURES 92–118. Navicula romanedwardii sp. nov. and Navicula seibigiana s.s. LM & SEM pictures of Navicula romanedwardii taken from the holotype population (sample D18) from James Ross Island and two other populations on James Ross Island and South Shetland Islands (indicated below). LM pictures of Navicula seibigiana taken from the type slide (Praep. Hintz 160, Eu-CH 15 in Coll. LangeBertalot). 92–98. Navicula romanedwardii, LM views of 7 valves from the type population. Fig. 92 shows the girdle view in LM. 99–103. Navicula seibigiana s.s., LM views of 5 valves from the type population. 104–114. Navicula romanedwardii, LM views of 11 valves from a Deception Island population (sample D37). 115. Navicula romanedwardii, SEM of an entire valve, external view. Arrows show the slits at the apices. 116. Navicula romanedwardii, SEM detail of the central area and central raphe endings. 117. Navicula romanedwardii, SEM of an entire valve, internal view (picture taken from James Ross Island, sample JRI015). 118. Navicula romanedwardii, SEM detail of the central part of the valve internally, showing the continuous raphe (picture taken from James Ross Island, sample JRI015). Scale bar represents 10 μm except for figs 116 and 118 where scale bar = 1 μm.
FIGURES 178–182 in Ten new Bacillariophyta species from James Ross Island and the South Shetland Islands (Maritime Antarctic Region)
FIGURES 178–182. Caloneis bacillum, LM, type (slide IV-18-A8, Van Heurck Collection at the Botanic Garden Meise, Belgium). Scale bar represents 10 μm.
FIGURES 18–34 in Ten new Bacillariophyta species from James Ross Island and the South Shetland Islands (Maritime Antarctic Region)
FIGURES 18–34. Chamaepinnularia elliptica sp. nov. Most LM and part of the SEM pictures taken from the holotype population (sample JRI-D02) from James Ross Island. 18–27. Light microscopy observations. 28–30. LM views of valves from South Shetland Islands. 31. SEM of an entire valve, external view (picture taken from Livingston Island, sample BY040). 32. SEM of an entire valve, external view. 33. SEM of an entire valve, internal view (picture taken from Livingston Island, sample BY040). 34. SEM of an entire valve, internal view. Scale bar represents 10 μm except for fig. 34 where scale bar = 1 μm.
FIGURES 157–177 in Ten new Bacillariophyta species from James Ross Island and the South Shetland Islands (Maritime Antarctic Region)
FIGURES 157–177. Sellaphora gracillima sp. nov. LM and most of the SEM pictures taken from the holotype population (sample BY049) from Livingston Island (South Shetland Islands).157–174. LM views of 18 valves from the type population. 175. SEM of an entire valve, external view. 176. SEM of an entire valve, internal view. 177. SEM of an entire valve, showing the valve mantle and girdle (picture taken from Livingston Island, sample BY051). Scale bar represents 10 μm except for figs 175–177 where scale bar = 5 μm.
FIGURES 81–91 in Ten new Bacillariophyta species from James Ross Island and the South Shetland Islands (Maritime Antarctic Region)
FIGURES 81–91. Muelleria pimpireviana sp. nov. LM & SEM pictures taken from the holotype population (sample NI26) from Nelson Island (South Shetland Islands). 81–89. LM views of 9 valves from the type population. 90. SEM of the valve exterior. 91. SEM detail of the apex, showing the bifurcated distal raphe endings. Scale bar represents 10 μm except for fig. 91 where scale bar = 2 μm.
FIGURES 1–17 in Ten new Bacillariophyta species from James Ross Island and the South Shetland Islands (Maritime Antarctic Region)
FIGURES 1–17. Caloneis australis sp. nov. LM and most SEM pictures taken from the holotype population (sample BY062) from Livingston Island (South Shetland Islands). 1–12. Light microscopy observations. Fig. 1 shows an intial valve, and Fig. 12 shows the girdle view. 13. SEM of an entire valve, externally. 14. SEM detail of the valve showing the central area and the lunate markings. 15. SEM detail of the valve face and mantle showing the striae; arrows indicate the slits on the mantle. 16. SEM of an entire valve, internal view (picture taken from James Ross Island, sample JRI032). 17. SEM detail of the mantle and girdle, showing the single row of pores on the valvocopula; arrows indicate the rounded plaques (picture taken from James Ross Island, sample JRI015). Scale bar represents 10 μm except for figs 14, 15 and 17 where scale bar = 1 μm.
Epiphytic diatom community structure and richness is determined by macroalgal host and location in the South Shetland Islands (Antarctica)
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Figures 1-6 in Synthesis Of The Bulgarian Protozoological Investigations Of South Shetland Islands (The Antarctic)
Figures 1-6. Coccidian parasites from the penguins of Pigoscelis spp. 1-2 – unsporulated oocysts of Eimeria pygosceli Golemansky, 2003; 3-4 - unsporulated oocysts of Eimeria sp.; 5-6 - unsporulated oocysts of Isospora sp.
Rock glaciers on South Shetland Islands, Antarctic Peninsula, Version 1
In the South Shetland Islands the investigators found eight active rock glaciers, no relict or fossil examples, and seven protalus ramparts. The rock glaciers are located on peninsulas and capes of the two main islands of the archipelago: King George and Livingston. The South Shetland Islands have a cold oceanic climate, characteristic of the maritime Antarctica, with frequent summer rains and moderate thermal amplitude, and a cold and humid morphoclimatic system, of crionival character. These climatic parameters facilitate the operation of periglacial processes, and the presence of a usually saturated active layer in summer. In the South Shetland Islands the presence of rock glaciers have been identified on Livingston Island (Martinez de Pison et al., 1991; Lopez-Martinez et al., 1992a, 1992b), on Admiralty Bay, in King George Island (Birkenmajer, 1981; Barsch et al., 1985) and in Fildes Peninsula (Barsch et al. 1985; Barsch, 1996; Cheng et al., 1996). Four further active rock glaciers have been identified during the present study in King George and Livingston Island (Serrano and Lopez-Martinez, in prep.). The rock glaciers are located in marginal zones, between 300 m asl and sea level, which has been recently deglaciated, and principally under 70 m asl, near 100 m under the Median Equilibrium Line Altitude (MELA). There are indications of a recent diminution of activity, with blurred fronts, mass movements in fronts and sides, lichen colonization and glaciokarstic processes. All of these indicate an inherited dynamic of past conditions in lower altitudes.References to rock glaciers are scarce in Antarctica, limited to a few examples in the Transantarctic Mountains, Victoria Land, South Georgia, James Ross Island, and South Shetland Islands. The spatial pattern of rock glaciers indicates that they are more represented in the periphery of Antarctica than in the interior of the continent, and are particularly numerous in the Antarctic Peninsula region. These data are presented on the CAPS Version 1.0 CD-ROM, June 1998.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
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International Brain Laboratory public data
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