Populations of breeding birds in Byers Peninsula, Livingston Island, South Shetland Islands

2013 ◽  
Vol 25 (2) ◽  
pp. 303-306 ◽  
Author(s):  
J.A. Gil-Delgado ◽  
J. González-Solís ◽  
A. Barbosa
Keyword(s):  
Gentoo Penguin ◽  
Chinstrap Penguin ◽  
South Shetland Islands ◽  
Giant Petrel ◽  
Shetland Islands ◽  
Kelp Gull ◽  
Livingston Island ◽  
Breeding Populations ◽  
Southern Giant Petrel ◽  
The Antarctic

AbstractData about breeding populations of birds in the Antarctica are rare and fragmented. Thus, information about the status of the breeding populations of Antarctic birds is crucial given the current scenario of climate change, which is particularly acute in Antarctica. This paper presents new information about the populations of the Antarctic tern Sterna vittata, the kelp gull Larus dominicanus, the southern giant petrel Macronectes giganteus, the Antarctic skua Catharacta antarctica lonnbergi, the chinstrap penguin Pygoscelis antarctica and the gentoo penguin Pygoscelis papua on Byers Peninsula (Livingston Island, South Shetland Islands). We used line transects counts to estimate both densities and numbers of nests of the different species. We estimate that there are 398.96 birds km-2 of southern giant petrels (2793 individuals), 62.4 birds km-2 of Antarctic tern (3746 individuals) and 269.1 birds km-2 of kelp gull (1884 individuals). Furthermore, we found 15 nests of Antarctic skua in 25 km2, from which we can estimate that 60–91 birds must breed on Byers Peninsula. We also censused two colonies of gentoo penguins (3000 and 1200 pairs) and 50 pairs of chinstrap. Compared to previous estimates, gentoo penguins seem to have increased whereas chinstrap penguin have decreased. Finally, the populations of Antarctic tern, southern giant petrel and kelp gull have stabilized or slightly increased.

New trigonioid bivalves from the Early Jurassic to earliest Cretaceous of the Antarctic Peninsula region: systematics and austral paleobiogeography

1995 ◽  
Vol 69 (1) ◽  
pp. 66-84 ◽  
Author(s):  
Simon R. A. Kelly
Keyword(s):  
New Zealand ◽  
Antarctic Peninsula ◽  
Southern Africa ◽  
Late Jurassic ◽  
Early Jurassic ◽  
South Shetland Islands ◽  
Shetland Islands ◽  
Livingston Island ◽  
History Of ◽  
The Antarctic

New discoveries of trigonioid bivalves are documented from three areas in the Antartic Peninsula: the Fossil Bluff Group of Alexander Island, the Latady Formation of the Orville Coast, and the Byers Group of Livingston Island, South Shetland Islands. Eleven taxa are described, representing six genera or subgenera. The faunas are characterized by genera including Vaugonia (Vaugonia), the first Early Jurassic trigonioid recognized on the continent; Vaugonia (V.) and V. (Orthotrigonia?) in the Late Jurassic; and Iotrigonia (Iotrigonia), Myophorella (Scaphogonia), and Pterotrigonia (Pterotrigonia), which span the Jurassic–Cretaceous boundary, reaching the Berriasian stage. The following species are new: Pterotrigonia (P.) cramei n. sp., Pterotrigonia (P.) thomsoni n. sp., Vaugonia (V.) orvillensis n. sp., and V. (Orthotrigonia?) quiltyi n. sp. The faunas show affinities with those of New Zealand and southern Africa. Trigonioids characterize the shallower marine biofacies in the Jurassic of the Antarctic and reflect the principal shallowing events in the history of the region.

scholarly journals Variations in ice rafted detritus on beaches in the South Shetland Islands: a possible climate proxy

2004 ◽  
Vol 16 (3) ◽  
pp. 339-344 ◽  
Author(s):  
BRENDA L. HALL ◽  
ETHAN R. PERRY
Keyword(s):  
Antarctic Peninsula ◽  
Ocean Circulation ◽  
Late Holocene ◽  
Warming Trend ◽  
South Shetland Islands ◽  
The South ◽  
Shetland Islands ◽  
Livingston Island ◽  
The Antarctic ◽  
Glacial Advance

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.

Cretaceous angiosperms from an allegedly Triassic flora at Williams Point, Livingston Island, South Shetland Islands

1989 ◽  
Vol 1 (3) ◽  
pp. 239-248 ◽  
Author(s):  
P.M. Rees ◽  
J.L. Smellie
Keyword(s):  
Antarctic Peninsula ◽  
Direct Evidence ◽  
South Shetland Islands ◽  
Fossil Flora ◽  
Volcanic Arc ◽  
Shetland Islands ◽  
Active Volcanism ◽  
Livingston Island ◽  
Radiometric Ages ◽  
The Antarctic

A terrestrial sequence on Livingston Island, South Shetland Islands, known as the Williams Point Beds contains a well-preserved, diverse fossil flora previously assigned a Triassic age. Because of their supposed age, volcanic provenance and evidence for active volcanism, the Williams Point Beds have occupied a unique position in Gondwana (pre-Jurassic) stratigraphy in the Antarctic Peninsula region. However, a large new collection of plant specimens obtained at Williams Point has yielded several species of angiosperm leaves, which are abundant and occur at all levels within the Williams Point Beds sequence. Thus, a Triassic age is no longer tenable. On the basis of the plants present and published radiometric ages for associated strata, the Williams Point Beds fossil flora is reassigned to the Cretaceous, and there is some evidence for a more restricted Albian–Cenomanian age. This revision of the age of the Williams Point Beds removes all direct evidence for an active Triassic volcanic arc in the Antarctic Peninsula region.

Censuses of penguin, blue-eyed shag, and southern giant petrel populations in the Antarctic Peninsula region, 1994–2000

Polar Record ◽  
2000 ◽  
Vol 36 (199) ◽  
pp. 323-334 ◽  
Author(s):  
Ron Naveen ◽  
Steven C. Forrest ◽  
Rosemary G. Dagit ◽  
Louise K. Blight ◽  
Wayne Z. Trivelpiece ◽  
...  
Keyword(s):  
Antarctic Peninsula ◽  
Census Data ◽  
Population Data ◽  
Gentoo Penguin ◽  
Population Estimates ◽  
Giant Petrel ◽  
Southern Giant Petrel ◽  
The Antarctic ◽  
First Time ◽  
Pygoscelid Penguins

AbstractThis paper presents new census data and population estimates for penguins, blue-eyed shags, and southern giant petrels from 26 sites in the Antarctic Peninsula, collected by the Antarctic Site Inventory from 1994 to 2000. For nine sites, population data or estimates are published for the first time. The newly discovered gentoo penguin population of 215 nests at Herofna Island (63°24'S, 54°36'W) represents the easternmost location where this species has been found breeding in the Peninsula. All three pygoscelid penguins — gentoo, Adelie, and chinstrap — were found breeding at Gourdin Island (63° 12'S, 57° 18'W), the fourth known site where these species nest contiguously in the Peninsula. During the period, significant declines in nesting populations of blue-eyed shag were documented at three northwestern Peninsula locations.

AN UNUSUAL SPINE-BEARINGPINNULARIASPECIES FROM THE ANTARCTIC LIVINGSTON ISLAND (SOUTH SHETLAND ISLANDS)

2009 ◽  
Vol 24 (2) ◽  
pp. 431-441 ◽  
Author(s):  
Bart Van de Vijver ◽  
Janelle T. Agius ◽  
John A.E. Gibson ◽  
Antonio Quesada
Keyword(s):  
South Shetland Islands ◽  
Shetland Islands ◽  
Livingston Island ◽  
The Antarctic

scholarly journals SYNTHESIS OF THE BULGARIAN PROTOZOOLOGICAL INVESTIGATIONS OF SOUTH  SHETLAND ISLANDS (THE  ANTARCTIC)

2016 ◽  
Vol 5 ◽  
pp. 47-56
Author(s):  
Vassil Golemansky
Keyword(s):  
Testate Amoebae ◽  
The Other ◽  
South Shetland Islands ◽  
Shetland Islands ◽  
Livingston Island ◽  
Coccidian Parasites ◽  
Freshwater Habitats ◽  
Naked Amoebae ◽  
The Antarctic ◽  
Penguin Species

Within the range of the Bulgarian Antarctic Program (1987-2010) some parasitological investigations on the coccidian parasites of 3 penguin species from South Shetland Islands (Livingston and St George Islands) were conducted, namely: Pygoscelis antarctica, P. papua and P. adeliae. Three coccidian species were found, one of which was described as a new species: Eimeria pygosceli Golemansky, 2003. It was isolated from the fecal samples of all 3 penguin species, living at South Shetland Islands. The other not identified coccidian’s were of the genera Eimeria and Isopspora. (Table 1).  The great number of coccidian’s oocysts in some of the examined birds (from 80 – 220 oocysts in one microscopic field) suggest for their pathogenic role on the penguin’s population.As a result of our studies on some soil, moss and freshwater habitats from Livingston Island a total of 48 rhizopods were found. Three of them were naked amoebae of  the genera Hartmanella, Thecamoeba and Vannella and the other 45 species were testate amoebae of 17 genera. Data on their occurrence frequency (pF) and dominance frequency (DF) were given (Table 2). The  research on the marine interstitial testate amoebae from the supralittoral of the Antarctic region of Chile and Livingston Island shows the presence of 17 species of psammobiotic and psammophilous testate amoebae (Table 3).

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