scholarly journals Distribution extension of the Spectacled Petrel (Procellaria conspicillata) off the Argentine continental shelf and oceanic adjacent waters

2019 ◽  
Vol 27 (2) ◽  
pp. 135-139
Author(s):  
Maximiliano Manuel Hernandez ◽  
Sofía Copello ◽  
Alexander Borowicz ◽  
Juan Pablo Seco-Pon
Keyword(s):  
Literature Review ◽  
Atlantic Ocean ◽  
Continental Shelf ◽  
Breeding Season ◽  
South Atlantic ◽  
South Atlantic Ocean ◽  
Target Area ◽  
Southwest Atlantic ◽  
Tristan Da Cunha

AbstractThe Spectacled Petrel Procellaria conspicillata is endemic of the Tristan da Cunha Archipelago, in the South Atlantic Ocean. However, it is scarcely detected in waters off Argentina beyond its traditional distribution along the southwest Atlantic during the breeding season. This study compiles distributional records of Spectacled Petrel for the target area (chiefly between 38°S to 46°S and 23°W to 57°W) obtained in situ, from non-systematic observations at sea, between 2015 and 2018 (totaling 4 trips); and by literature review. Nineteen new sightings of the species are presented. In 46 sightings a total of 65 individuals were recorded chiefly within waters of the Argentine continental shelf (< 200 m) (46%) and oceanic adjacent waters (54%). The bulk of the sightings (95%) were obtained during the species breeding season. In addition, we report the southernmost record of the species in oceanic waters for the southwest Atlantic (46°10′S; 57°06′W).

scholarly journals A juvenile Tristan albatross (Diomedea dabbenena) on land at the Crozet Islands

Polar Biology ◽  
2020 ◽  
Author(s):  
Alexander L. Bond ◽  
Christopher Taylor ◽  
David Kinchin-Smith ◽  
Derren Fox ◽  
Emma Witcutt ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Cytochrome B ◽  
Adult Male ◽  
Mitochondrial Gene ◽  
Small Population ◽  
South Atlantic ◽  
South Atlantic Ocean ◽  
Tristan Da Cunha ◽  
Gough Island ◽  
Dispersal Events

AbstractAlbatrosses and other seabirds are generally highly philopatric, returning to natal colonies when they achieve breeding age. This is not universal, however, and cases of extraordinary vagrancy are rare. The Tristan Albatross (Diomedea dabbenena) breeds on Gough Island in the South Atlantic Ocean, with a small population on Inaccessible Island, Tristan da Cunha, ca 380 km away. In 2015, we observed an adult male albatross in Gonydale, Gough Island, which had been ringed on Ile de la Possession, Crozet Islands in 2009 when it was assumed to be an immature Wandering Albatross (D. exulans). We sequenced 1109 bp of the cytochrome b mitochondrial gene from this bird, and confirmed it to be a Tristan Albatross, meaning its presence on Crozet 6 years previous, and nearly 5000 km away, was a case of prospecting behaviour in a heterospecific colony. Given the challenges in identifying immature Diomedea albatrosses, such dispersal events may be more common than thought previously.

scholarly journals The Sinking of Another Tristan da Cunha Moss Endemic and Its Phytogeographical Consequences

2020 ◽  
Vol 89 (3) ◽  
Author(s):  
Ryszard Ochyra ◽  
Vítězslav Plášek
Keyword(s):  
Atlantic Ocean ◽  
Southern Hemisphere ◽  
Endemic Species ◽  
Distribution Patterns ◽  
South Atlantic ◽  
South Atlantic Ocean ◽  
Original Material ◽  
The Third ◽  
Tristan Da Cunha ◽  
Central South

<p>The original material of <em>Isopterygium tristaniense </em>Dixon, an endemic species of the Tristan da Cunha archipelago in the central South Atlantic Ocean, is taxonomically evaluated and some details of its morphology are illustrated. The species is found to be conspecific with the Holarctic <em>Pseudotaxiphyllum elegans </em>(Brid.) Z.Iwats. and it is the third record of the species in the Southern Hemisphere. The global distribution of this species is reviewed and the distribution patterns of the South Atlantic mosses are briefly discussed.</p>

Gondwanorchestia tristanensis gen. nov. sp. nov., a new southern hemisphere genus and species of talitrid amphipod (Amphipoda, Senticaudata, Talitridae)

Zootaxa ◽  
2020 ◽  
Vol 4748 (2) ◽  
pp. 375-381
Author(s):  
JAMES K. LOWRY ◽  
ALAN A. MYERS ◽  
JORGE PÉREZ-SCHULTHEISS
Keyword(s):  
Atlantic Ocean ◽  
Southern Hemisphere ◽  
New Genus ◽  
South Atlantic ◽  
South Atlantic Ocean ◽  
New Genus And Species ◽  
The South ◽  
Tristan Da Cunha

Material collected by the Norwegian Scientific Expedition to Tristan Da Cunha in the South Atlantic Ocean in the years 1937–1938 and later attributed by Stephensen, 1949 to Orchestia scutigerula Dana, 1852 has been re-examined and is described as a new genus and species, Gondwanorchestia tristanensis sp. nov. Orchestia scutigerula Dana, 1852 is transferred to Gondwanorchestia gen nov. and compared with G. tristanensis sp. nov. 

scholarly journals First in situ record of the medusa stage of Cladonema radiatum (Cnidaria: Anthoathecata) in the South Atlantic Ocean

2020 ◽  
Vol 68 ◽  
Author(s):  
Gabriel Bittencourt Farias ◽  
Sigrid Neumann Leitão ◽  
Pedro Augusto Mendes de Castro Melo ◽  
Miodeli Nogueira Júnior ◽  
Everton Giachini Tosetto
Keyword(s):  
Atlantic Ocean ◽  
South Atlantic ◽  
South Atlantic Ocean ◽  
The South ◽  
Medusa Stage

Hydromedusae (Cnidaria: Hydrozoa) from the temperate southwestern Atlantic Ocean: a review

Zootaxa ◽  
2008 ◽  
Vol 1750 (1) ◽  
pp. 1 ◽  
Author(s):  
GENZANO GABRIEL ◽  
HERMES MIANZAN ◽  
JEAN BOUILLON
Keyword(s):  
Species Richness ◽  
Atlantic Ocean ◽  
Continental Shelf ◽  
New Records ◽  
South Atlantic Ocean ◽  
Valid Species ◽  
Southwestern Atlantic ◽  
Southwest Atlantic ◽  
Number Of Species ◽  
Southwestern Atlantic Ocean

Hydromedusae are one of the best-represented planktonic groups in waters of the South Atlantic Ocean in terms of species richness. Nevertheless, medusae of the region are inadequately known because earlier studies have been limited and restricted to few areas. During the last two decades, almost 2000 samples from 54 research cruises have been collected, mostly within the continental shelf of Argentina and Uruguay (33 – 55º S). These samples provide an opportunity to significantly augment knowledge of the richness of the medusa fauna in the southwest Atlantic. Forty species of hydromedusae (six of them new records for the area), including 15 of Anthomedusae, 14 of Leptomedusae, three of Limnomedusae, four of Narcomedusae, and four of Trachymedusae, were identified. Our results indicate that previous lists overestimated species richness of hydromedusae in the area. When misidentifications, updated species synonymies, and doubtful records are taken into account, 71 valid species are recognized here from the study area. Based upon this corrected inventory list, the data suggest that the number of species of hydromedusae decreases markedly with increasing latitude, corresponding with that observed in other planktonic groups of invertebrates.

Nikoides schmitti Manning & Chace, 1971 (Caridea: Processidae) in the South Atlantic Ocean, with an updated list and key for processid shrimps of Brazil

Zootaxa ◽  
2011 ◽  
Vol 2864 (1) ◽  
pp. 34 ◽  
Author(s):  
ALEXANDRE OLIVEIRA ALMEIDA ◽  
LUIS ERNESTO ARRUDA BEZERRA
Keyword(s):  
Atlantic Ocean ◽  
Continental Shelf ◽  
South Atlantic ◽  
South Atlantic Ocean ◽  
Depth Range ◽  
The South ◽  
Soft Bottoms ◽  
First Time

The shrimp Nikoides schmitti Manning & Chace, 1971 (Decapoda: Caridea: Processidae) is reported for the first time from the South Atlantic Ocean, based on four specimens dredged on soft bottoms of the continental shelf of the Camamu Basin, Bahia, Brazil (13°28’–13°30’S; 38°47’–38°49’W), at a depth range of 38–49 m depth. The Brazilian material is illustrated and an updated list of the Brazilian processid shrimps and a key for their identification are provided.

Relationships between atmospheric organic compounds and air-mass exposure to marine biology

2010 ◽  
Vol 7 (3) ◽  
pp. 232 ◽  
Author(s):  
S. R. Arnold ◽  
D. V. Spracklen ◽  
S. Gebhardt ◽  
T. Custer ◽  
J. Williams ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Organic Compounds ◽  
Marine Biology ◽  
Transport Model ◽  
Oxidative Capacity ◽  
South Atlantic ◽  
Biologically Active ◽  
South Atlantic Ocean ◽  
Air Mass

Environmental context.The exchange of gases between the atmosphere and oceans impacts Earth’s climate. Over the remote oceans, marine emissions of organic species may have significant impacts on cloud properties and the atmosphere’s oxidative capacity. Quantifying these emissions and their dependence on ocean biology over the global oceans is a major challenge. Here we present a new method which relates atmospheric abundance of several organic chemicals over the South Atlantic Ocean to the exposure of air to ocean biology over several days before its sampling. Abstract.We have used a Lagrangian transport model and satellite observations of oceanic chlorophyll-a concentrations and phytoplankton community structure, to investigate relationships between air mass biological exposure and atmospheric concentrations of organic compounds over the remote South Atlantic Ocean in January and February 2007. Accounting for spatial and temporal exposure of air masses to chlorophyll from biologically active ocean regions upwind of the observation location produces significant correlations with atmospheric organohalogens, despite insignificant or smaller correlations using commonly applied in-situ chlorophyll. Strongest correlations (r = 0.42–0.53) are obtained with chlorophyll exposure over a 2-day transport history for CHBr3, CH2Br2, CH3I, and dimethylsulfide, and are strengthened further with exposure to specific phytoplankton types. Incorporating daylight and wind-speed terms into the chlorophyll exposure results in reduced correlations. The method demonstrates that conclusions drawn regarding oceanic trace-gas sources from in-situ chlorophyll or satellite chlorophyll averages over arbitrary areas may prove erroneous without accounting for the transport history of air sampled.

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