Population structure of Squatina guggenheim (Squatiniformes, Squatinidae) from the south-western Atlantic Ocean

2014 ◽  
Vol 86 (1) ◽  
pp. 186-202 ◽  
Author(s):  
G. Garcia ◽  
S. Pereyra ◽  
V. Gutierrez ◽  
S. Oviedo ◽  
P. Miller ◽  
...  
Keyword(s):  
Population Structure ◽  
Atlantic Ocean ◽  
The South ◽  
Western Atlantic ◽  
Western Atlantic Ocean

Vertical distribution of mesozooplankton and ichthyoplankton communities in the South-western Atlantic Ocean (23°14′1″S 40°42′19″W)

2018 ◽  
Vol 99 (1) ◽  
pp. 51-65
Author(s):  
Ana C. T. Bonecker ◽  
Cristina De O. Dias ◽  
Marcia S. De Castro ◽  
Pedro F. De Carvalho ◽  
Adriana V. Araujo ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Vertical Distribution ◽  
Heterotrophic Bacteria ◽  
Larval Fish ◽  
Nutrient Concentrations ◽  
Intermediate Water ◽  
The South ◽  
Night Time ◽  
Western Atlantic ◽  
Western Atlantic Ocean

A study was conducted over eight consecutive days in February 2010 in which daily variations in the vertical distributions of heterotrophic bacteria, mesozooplankton and ichthyoplankton at 1–1200 m in the South-western Atlantic Ocean were investigated. Diurnal and nocturnal samples were collected at an oceanographic station at four regional depths: Tropical Water (TW) (1 m), South Atlantic Central Water (SACW) (250 m), Antarctic Intermediate Water (AAIW) (800 m) and Upper Circumpolar Deep Water (UCDW) (1200 m). Bacterial, mesozooplankton and larval fish densities significantly differed between sample depths but not between sampling tow times. In total, 154 zooplankton species and 18 larval fish species were identified. The highest number of taxa was obtained from the night-time TW trawls. This depth zone had the highest densities of mesozooplankton, larval fish and bacterioplankton (auto and heterotrophic), associated with the highest temperature and salinity and the lowest inorganic nutrient concentrations. Two sample groups were identified based on their mesozooplankton and larval fish compositions: night-time TW and other water masses (daytime TW, SACW, AAIW and UCDW). Thirty-two indicator species were detected in night-time TW. The copepod Nullosetigera impar was, to the best of our knowledge, identified for the first time on the Brazilian coast. Our results showed significant variability in the abundance and vertical distribution of mesozooplankton, bacterioplankton and larval fish along the water column in an oceanic area. We have provided new data and insights on the composition and vertical distribution of mesozooplankton, larval fish and bacterioplankton in deep waters in the South-western Atlantic Ocean.

New records of octocorals (Cnidaria, Anthozoa) from the south western Atlantic Ocean, with zoogeographic considerations

Zootaxa ◽  
2004 ◽  
Vol 630 (1) ◽  
pp. 1 ◽  
Author(s):  
CARLOS D. PÉREZ ◽  
MAURICIO O. ZAMPONI
Keyword(s):  
Atlantic Ocean ◽  
New Records ◽  
American Continent ◽  
The South ◽  
Western Atlantic ◽  
Western Atlantic Ocean ◽  
East Pacific ◽  
South West ◽  
First Case ◽  
Present Distribution

The present study deals with six new records of octocoral species (two alcyoniid soft corals and four primnoid gorgonians) for the south western Atlantic Ocean. These new records, mainly for the gorgonians, improves the knowledge of their present distribution. The species Thouarella koellikeri and Dasystenella acanthina have their known distribution widened, showing in the first case a continuous bioceanic distribution (south east Pacific south west Atlantic). The species of the genus Primnoella, P. biserialis and P. compressa, widen their distributional range tending to a geographical continuity along the south eastern coasts of the American continent, avoiding the zoogeographic barrier constituted by the R o de la Plata.

New records and range extension of the Portuguese dogfish Centroscymnus coelolepis in the south‐western Atlantic Ocean, with comments on its morphology

2020 ◽  
Vol 96 (3) ◽  
pp. 601-616
Author(s):  
Federico Mas ◽  
Rodrigo Forselledo ◽  
Andrés Domingo ◽  
Oscar Pin ◽  
Pablo Troncoso ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
New Records ◽  
Range Extension ◽  
The South ◽  
Western Atlantic ◽  
Western Atlantic Ocean

Southern right whales in the South-western Atlantic Ocean: proposed criteria to identify suitable areas of use in poorly known reproductive grounds

2019 ◽  
Vol 99 (5) ◽  
pp. 1231-1236
Author(s):  
Giovanna Corrêa e Figueiredo ◽  
Samara Cazzoli y Goya ◽  
Marcos César de Oliveira Santos
Keyword(s):  
Atlantic Ocean ◽  
Eastern Coast ◽  
The South ◽  
Sandy Bottom ◽  
Western Atlantic ◽  
South Eastern ◽  
Western Atlantic Ocean ◽  
Right Whale ◽  
Ranking Criteria ◽  
Right Whales

AbstractUrbanization and intense vessel traffic in coastal areas are obstacles for right whales when selecting breeding and calving grounds. Human activities might be the main cause for the recently observed drop in right whale sightings along the south-eastern coast of Brazil. Information concerning the biology and the activities that can potentially affect the presence of individuals along the coast are essential for management purposes, as well as for the recovery of the species stocks after a period of whaling pressure. This study correlated the occurrence of right whales in the northern limit of the breeding ground in the South-western Atlantic Ocean with local geomorphology, degree of urbanization and oceanographic features to better identify suitable areas for use by these whales. The study area was divided into 14 sub-areas based on local coastal geomorphology and discharge of large rivers. The following five ranking criteria were applied to each sub-area: presence of whaling stations and whaling activity in the past; presence and activity of ports; protection from swell, coastal slope and composition of the bottom substrate. The sub-areas that offered conditions conducive to the presence of right whales received higher scores. The proposed criteria were validated by overlapping the ranking scores with the records of right whales sighted in each sub-area. In south-eastern Brazil, protected areas with sandy bottom and gentle slope were associated with more sightings of female-calf pairs. The criteria can be used as a primary diagnostic indicating suitable sub-areas for right whales in poorly known breeding grounds.

Hogfish Lachnolaimus maximus (Labridae) confirmed in the south-western Atlantic Ocean

2016 ◽  
Vol 89 (3) ◽  
pp. 1873-1879 ◽  
Author(s):  
C. L. S. Sampaio ◽  
J. Santander-neto ◽  
T. L. A. Costa
Keyword(s):  
Atlantic Ocean ◽  
The South ◽  
Western Atlantic ◽  
Western Atlantic Ocean

Cookie-cutter shark Isistius spp. predation upon different tuna species from the south-western Atlantic Ocean

2018 ◽  
Vol 92 (4) ◽  
pp. 1082-1089 ◽  
Author(s):  
Y. V. Niella ◽  
L. A. G. Duarte ◽  
V. R. Bandeira ◽  
O. Crespo ◽  
D. Beare ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
The South ◽  
Western Atlantic ◽  
Western Atlantic Ocean
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