Reighardia sternae (Diesing, 1864) (Pentastomida) from seabirds in Antarctica

1987 ◽  
Vol 65 (5) ◽  
pp. 1289-1291 ◽  
Author(s):  
Eric P. Hoberg
Keyword(s):  
Life Cycle ◽  
Antarctic Peninsula ◽  
Mature Female ◽  
Immature Female ◽  
Larus Dominicanus ◽  
Breeding Grounds ◽  
Catharacta Maccormicki ◽  
The Antarctic ◽  
First Time ◽  
South Polar

Specimens of the pentastome Reighardia sternae (Diesing, 1864) are reported for the first time in avian hosts from Antarctica. Mature female specimens were found in a southern black-backed gull (Larus dominicanus Lichtenstein) (1 of 21 examined) while an immature female was found in a south polar skua (Catharacta maccormicki (Saunders)) (1 of 20). Species of Reighardia have not previously been reported among any of the Stercorariinae. The degree of development of individuals of R. sternae provided evidence that the life cycle of this pentastome could be completed on the breeding grounds of its hosts in the region of the Antarctic Peninsula.

Nautilids from the Upper Cretaceous of the James Ross Basin, Antarctic Peninsula

2005 ◽  
Vol 17 (2) ◽  
pp. 267-280 ◽  
Author(s):  
MARCELA CICHOWOLSKI ◽  
ALFREDO AMBROSIO ◽  
ANDREA CONCHEYRO
Keyword(s):  
New Species ◽  
Antarctic Peninsula ◽  
Upper Cretaceous ◽  
Single Species ◽  
Central Chile ◽  
James Ross Island ◽  
The Antarctic ◽  
First Time ◽  
A New Species ◽  
Lower Campanian

To date, Cretaceous nautilids from the Antarctic Peninsula have received little attention and only a single species had been reported, Eutrephoceras simile Spath, from Seymour, Snow Hill, and James Ross islands. Currently, it is considered a synonym of Eutrephoceras subplicatum (Steinmann), which has also been described from the Upper Cretaceous of central Chile, southern Argentina and Angola. Here, we report and describe E. subplicatum in detail, based on specimens from the Lower Campanian–Maastrichtian of Vega, Seymour and James Ross islands, presenting, for the first time, embryonic conch features related to the palaeoecology of these organisms. The nauta of this species had a diameter of approximately 30 mm with 5–6 septa. In addition, we describe a new species, Eutrephoceras antarcticum, and one specimen assigned to the same genus in open nomenclature, both recovered from the Lower Campanian beds of James Ross Island.

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.

A new species and new records of Lecanora (Lecanoraceae, lichenized Ascomycota) with usnic acid from the Antarctic region

Phytotaxa ◽  
2016 ◽  
Vol 261 (2) ◽  
pp. 185 ◽  
Author(s):  
IRIS NADIA DE LA ROSA ◽  
ALFREDO PASSO ◽  
JUAN MANUEL RODRÍGUEZ ◽  
JORGE OSCAR CHIAPELLA ◽  
MARÍA INÉS MESSUTI
Keyword(s):  
New Species ◽  
Secondary Metabolite ◽  
Antarctic Peninsula ◽  
New Records ◽  
Usnic Acid ◽  
Distribution Range ◽  
Antarctic Region ◽  
The Antarctic ◽  
First Time ◽  
A New Species

A new species of Lecanora, L. flavocrassa, is described from the Antarctic region. Additionally, L. stenotropa is registered for the first time from Antarctica and the distribution range of L. intricata is extended to the Antarctic Peninsula. A key to the species of Lecanora from Antarctica that contain usnic acid as secondary metabolite is presented.

scholarly journals Migratory connections among breeding grounds off the Eastern Pacific and feeding areas in the Antarctic Peninsula based on genotype matching

2021 ◽  
Vol 50 (SuplEsp) ◽  
pp. 31-40
Author(s):  
Susana Caballero ◽  
Debbie Steel ◽  
Logan Pallin ◽  
Natalia Botero ◽  
Fernando Felix ◽  
...  
Keyword(s):  
Antarctic Peninsula ◽  
Microsatellite Loci ◽  
North Pacific ◽  
Sampling Location ◽  
Data Sets ◽  
Migratory Connectivity ◽  
Breeding Grounds ◽  
Feeding Area ◽  
The Antarctic ◽  
Feeding Grounds

We analysed 114 DNA samples collected in different locations within the stock G breeding grounds, including Ecuador and the northern and southern Pacific of Colombia. We genotyped 15 microsatellite loci, sexed all samples, and performed genotype comparisons. Genotype comparisons were done using a DNA register of previously genotyped individuals from the Colombian breeding ground and the Antarctic Peninsula feeding Area. We confirmed connectivity between feeding grounds in Antarctic Peninsula and breeding grounds in Colombia and Ecuador using microsatellite loci. We found recaptures within each sampling location in the same year, but we also found a few recaptures in the same locations between years both in breeding and feeding grounds. Interestingly, we found recaptures between breeding and feeding grounds using samples collected 20 years apart, providing some information about longevity in this stock. Further comparisons with other data sets (Brazil, North Pacific) are needed to understand the migratory connectivity of this stock.

scholarly journals Annotated and illustrated list of echinoderms collected during the Colombian scientific expeditions to the Antarctica (2016-2019)

2021 ◽  
Vol 50 (SuplEsp) ◽  
pp. 85-108
Author(s):  
Giomar Borrero ◽  
Daniela Yepes
Keyword(s):  
Geographical Distribution ◽  
Antarctic Peninsula ◽  
Sea Cucumber ◽  
Base Line ◽  
Antarctic Shelf ◽  
The Antarctic ◽  
First Time ◽  
Oceanographic Conditions

I n order to contribute to the base line of knowledge that is being built of the Gerlache Strait and the adjacent areas, the echinoderms collected during the Scientific Expeditions from Colombia to Antarctica carried out between 2016 and 2019 as part of the project “Biodiversity and oceanographic conditions of the Gerlache Strait, Biogerlache-Antártica” are presented. Eleven stations between 54 and 523 m deep were sampled, using sediment dredgers that captured incidentally some individuals from the mega and macro-epifauna, which were separated, reviewed and identified. Twentynine (29) individuals were obtained in five of the sampled stations, belonging to 13 morphotypes. Ophiuroidea was the richest class (five morphotypes), followed by Holothuroidea (four), Asteroidea (two) and Crinoidea (two). Morphological and distribution comments are presented, as well as general and detailed images of each morphotype. Among the contributions to the inventory of echinoderms in the area, it is highlighted the sea cucumber genus Taeniogyrus Semper, 1867 that is registered for the first time for the Antarctic peninsula and the crinoid species Anthometrina adriani (Bell, 1908) that extends its geographical distribution, confined to the high-Antarctic shelf, up to the Gerlache Strait ( 64° 39 ‘S).

Sedimentary basins on the east flank of the Antarctic Peninsula: proposed nomenclature

1992 ◽  
Vol 4 (4) ◽  
pp. 477-478 ◽  
Author(s):  
R.A. Del Valle ◽  
D.H. Elliot ◽  
D.I.M. Macdonald
Keyword(s):  
Antarctic Peninsula ◽  
Sedimentary Rock ◽  
Sedimentary Basins ◽  
Geological Mapping ◽  
Basin Evolution ◽  
Island Area ◽  
James Ross Island ◽  
The Antarctic ◽  
South Polar ◽  
Seymour Island

The first fossils from Antarctica were collected from Seymour Island in December 1892, during the voyage of the Jason under Captain C.A. Larsen. The Swedish South Polar Expedition of 1901–1903, led by Otto Nordenskjöld, proved that there were extensive deposits of fossiliferous Cretaceous and Tertiary sedimentary rock in the James Ross Island area. This was confirmed by later geological mapping (Bibby 1966). Subsequent investigations have led to the establishment of various lithostratigraphic schemes (e.g. Ineson et al. 1986), and interpretation of the sedimentary history in terms of basin evolution (Elliot 1988, Macdonald et al. 1988). Unfortunately, different names have been proposed for the depositional basin, with consequent confusion. The purpose of this note is to review previous usage and propose a new consistent nomenclature for the sedimentary basins east of the Antarctic Peninsula.

Late Eocene gadiform (Teleostei) skull from Seymour Island, Antarctic Peninsula

1991 ◽  
Vol 3 (1) ◽  
pp. 87-95 ◽  
Author(s):  
Joseph T. Eastman ◽  
Lance Grande
Keyword(s):  
Antarctic Peninsula ◽  
Late Eocene ◽  
Climatic Conditions ◽  
Convincing Evidence ◽  
Posterior Half ◽  
Antarctic Region ◽  
La Meseta Formation ◽  
The Antarctic ◽  
First Time ◽  
Seymour Island

On the basis of a skull from the late Eocene La Meseta Formation on Seymour Island, Antarctic Peninsula, a gadiform fish is reported from the Antarctic region for the first time. This specimen, the most completely preserved fossil teleost cranium yet described from Antarctica, provides convincing evidence for the presence of Gadiformes in a far southerly location under temperate climatic conditions 40 m.y. ago. The exoccipital condyles, supraoccipital and lambdoidal crests, and post-temporal and supratemporal fossae are well preserved, as are the roofing bones on the posterior half of the skull. Comparative osteological study indicates that these features are very similar in appearance to those of merlucciids (hakes) and gadids (cods).

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