Brazilian project of the Saint Peter Saint Paul Islands: the mantle exposure along the transform fault system of the Equatorial Atlantic region

This paper presents gravimetric and morphologic analyses based on the satellite-derived data set of EGM2008 and TOPEX for the area of the oceanic mantle massif of the Saint Peter and Saint Paul peridotite ridge, Equatorial Atlantic Ocean. The free-air anomaly indicates that the present plate boundary is not situated along the longitudinal graben which cuts peridotite ridge, but about 20 km to the north of it. The high Bouguer anomaly of the peridotite ridge suggests that it is constituted mainly by unserpentinised ultramafic rocks. The absence of isostatic compensation and low-degree serpentinisation of the ultramafic rocks indicate that the peridotite ridge is sustained mainly by active tectonic uplift. The unparallel relation between the transform fault and the relative plate motion generates near north-south compression and the consequent tectonic uplift. In this sense, the peridotite massif is a pressure ridge due to the strike-slip displacement of the Saint Paul Transform Fault.

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On-Going Uplift Rate Of The Saint Peter Saint Paul Peridotite Ridge, Equatorial Atlantic Ocean, Base On Geomorphologic Analyses Of Wave-Cut Bench And 14C Dating For Coral Fossils

10.3997/2214-4609-pdb.195.2100_evt_6year_2009 ◽

2009 ◽

Author(s):

Susanna Eleonora Sichel ◽

Akihisa Motoki ◽

Thomas Ferreira Da Costa Campos ◽

Rodrigo Soares ◽

Kenji Freire Motoki

Keyword(s):

Atlantic Ocean ◽

Saint Paul ◽

Uplift Rate ◽

Equatorial Atlantic ◽

14C Dating ◽

Equatorial Atlantic Ocean ◽

Saint Peter

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Biology of Grapsus grapsus (Linnaeus, 1758) (Brachyura, Grapsidae) in the Saint Peter and Saint Paul Archipelago, Equatorial Atlantic Ocean

Helgoland Marine Research ◽

10.1007/s10152-010-0220-5 ◽

2010 ◽

Vol 65 (3) ◽

pp. 263-273 ◽

Cited By ~ 15

Author(s):

A. S. Freire ◽

M. A. A. Pinheiro ◽

H. Karam-Silva ◽

M. M. Teschima

Keyword(s):

Atlantic Ocean ◽

Saint Paul ◽

Equatorial Atlantic ◽

Equatorial Atlantic Ocean ◽

Saint Peter

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Review of the Brazilian species of Physiculus (Gadiformes: Moridae), with description of a new species from Saint Peter and Saint Paul Archipelago, equatorial Atlantic

Zootaxa ◽

10.11646/zootaxa.4671.1.5 ◽

2019 ◽

Vol 4671 (1) ◽

pp. 67-80 ◽

Cited By ~ 2

Author(s):

ALESSANDRA M. A. PIRES ◽

ALFREDO CARVALHO-FILHO ◽

RÔMULO C. P. FERREIRA ◽

DANIELLE VIANA ◽

DIOGO NUNES ◽

...

Keyword(s):

New Species ◽

Saint Paul ◽

Valid Species ◽

Equatorial Atlantic ◽

Pectoral Fin ◽

Dorsal Fin ◽

Brazilian Species ◽

Fin Rays ◽

Saint Peter ◽

Pectoral Fin Rays

Three valid species of the genus Physiculus are known from the Brazilian marinewaters. A fourth, new species, Physiculus cirm n. sp.., is described based on seventeen specimens collected in the surroundings of Saint Peter and Saint Paul Archipelago, equatorial Atlantic. A review of the Brazilian species of Physiculus is provided, as well as a key to the species of the genus reported from the Atlantic Ocean. The new species is distinguished from all its congeners, except P. cynodon and P. karrerae, by the large number of longitudinal series of scales (156–189 vs. 70–150). P. cynodon from the Northern Pacific has about 200 longitudinal series of scales, and it differs from the new species by the number of rays of the first dorsal fin (6–8 vs. 10 in P. cynodon), pectoral-fin rays (20–25 vs. 27 in P. cynodon), and the presence of an outer row of large canine teeth on upper and lower jaw. From P. karrerae, which has 134–160 longitudinal series of scales, the new species differs by the presence of scales on the tip of the snout and dorsal-fin membrane, and the number of pectoral-fin rays (20–25 vs. 24–27 in P. karrerae). [Zoobank URL: urn:lsid:zoobank.org:act:1AFBC251-2BB1-4479-98A4-307188EC5D66]

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A vagrant Black-headed Gull (Chroicocephalus ridibundus) documented from Saint Peter and Saint Paul Archipelago: Brazil’s first record

Ornithology Research ◽

10.1007/s43388-021-00036-3 ◽

2020 ◽

Vol 28 (4) ◽

pp. 263-266

Author(s):

Antônio Coimbra de Brum ◽

Renata Brentano ◽

Rosalinda Carmela Montone ◽

Maria Virginia Petry

Keyword(s):

Atlantic Ocean ◽

Saint Paul ◽

First Record ◽

Breeding Population ◽

Intertropical Convergence Zone ◽

Equatorial Atlantic ◽

Trade Winds ◽

Equatorial Atlantic Ocean ◽

Palearctic Species ◽

Saint Peter

AbstractWe report the sighting of a specimen of Black-headed Gull (Chroicocephalus ridibundus) in Saint Peter and Saint Paul Archipelago (SPSPA), Brazil, in the mid-Atlantic Ocean. Chroicocephalus ridibundus is a Palearctic species that breeds throughout Europe. Part of the population spends winters in the Mediterranean and coasts of Africa, and a small breeding population remains in the northeast coast of North America. The specimen was on the island for 27 days, between 09 February and 06 March 2020. The gull was identified as a first-winter bird based on its plumage. We conclude that the vagrancy of yet another Old World species at the oceanic SPSPA in the western equatorial Atlantic Ocean was caused by the southwesterly trade winds of the Intertropical Convergence Zone. To our knowledge, this is the first documented record of C. ridibundus in the Brazilian territory.

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New records of two teleost species from two insular areas of the western equatorial Atlantic

Check List ◽

10.15560/17.6.1515 ◽

2021 ◽

Vol 17 (6) ◽

pp. 1515-1520

Author(s):

Rodrigo Xavier Soares ◽

Karlla Danielle Jorge Amorim ◽

Amanda Torres Borges ◽

Wagner Franco Molina ◽

José Garcia Júnior

Keyword(s):

New Records ◽

Saint Paul ◽

First Record ◽

Equatorial Atlantic ◽

Teleost Species ◽

Fernando De Noronha ◽

Mid Atlantic Ridge ◽

Saint Peter ◽

Volcanic Islands ◽

Northeastern Coast

We report the first record of two teleost species from two archipelagos in the western equatorial Atlantic. We recorded the occurrence of Cantherhines pullus (Ranzani, 1842) (Monacanthidae, Tetraodontiformes) from the Fernando de Noronha Archipelago, a group of volcanic islands 345 km off the northeastern coast of Brazil. We also report the first regional record of Hemiramphus brasiliensis (Linnaeus, 1758) (Hemiramphidae, Beloniformes) from the Saint Peter and Saint Paul’s Archipelago, which is a small and isolated group of rocky islands 520 km from the Fernando de Noronha Archipelago on the Mid-Atlantic Ridge.

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