The effect of the Fernando de Noronha plume on the mantle lithosphere in north-eastern Brazil

Lithos ◽  
2007 ◽  
Vol 94 (1-4) ◽  
pp. 111-131 ◽  
Author(s):  
Giorgio Rivalenti ◽  
Alberto Zanetti ◽  
Vicente A.V. Girardi ◽  
Maurizio Mazzucchelli ◽  
Colombo C.G. Tassinari ◽  
...  
Keyword(s):  
Mantle Lithosphere ◽  
Eastern Brazil ◽  
North Eastern ◽  
Fernando De Noronha

scholarly journals Whalesuckers and a spinner dolphin bonded for weeks: does host fidelity pay off?

2003 ◽  
Vol 3 (2) ◽  
pp. 1-5 ◽  
Author(s):  
José Martins Silva-Jr ◽  
Ivan Sazima
Keyword(s):  
First Record ◽  
Host Fidelity ◽  
Social Nature ◽  
Eastern Brazil ◽  
Individual Host ◽  
North Eastern ◽  
Fernando De Noronha ◽  
In The Wild ◽  
Spinner Dolphins ◽  
First Time

The whalesucker Remora australis (Echeneidae) is an oceanic diskfish found attached to cetaceans only and its habits are therefore poorly known. At the Fernando de Noronha Archipelago, off North-eastern Brazil, spinner dolphins Stenella longirostris (Delphinidae) regularly congregate in large groups in a shallow bay, which allows for underwater observations of their behaviour and their fish associates. In the course of a broader study of this elusive diskfish, we had the opportunity to made multiple records of two whalesucker couples (three of the fish naturally marked) attached to the same individual dolphin in two different years, over periods of 47 and 87 days respectively. In all the sightings the whalesucker individuals of a couple were recorded side-by-side and positioned on their host’s belly. We surmise that at least one of the couples was a reproductive pair, as the belly of the larger fish was noticeably swollen in the last sighting, and the bulge on its belly was bilateral and extended almost uniformly to the vent, a strong indication of fully mature gonads. Moreover, its size matched those of the mature females of this diskfish species. To our knowledge, this is the first time that attachment fidelity of the whalesucker to any cetacean host is documented in the wild. We hypothesize that attachment fidelity to the same individual host increases the whalesucker’s chance to mate, and suggest further that the highly social nature of the spinner dolphins facilitates encounters between potential mating partners. Our study indicates that host fidelity possibly is not an uncommon feature of the whalesucker behaviour, albeit difficult to recognise. In one of the above recorded whalesuckers the natural marking was a crescentic scar characteristic of the wounds inflicted by the cookiecutter Isistius brasiliensis (Dalatiidae), a first record of the attack of this shark to any diskfish species.

scholarly journals Taxonomic revision of the genus Hyperaulax Pilsbry, 1897 (Gastropoda, Stylommatophora, Odontostomidae)

2019 ◽  
Vol 95 (2) ◽  
pp. 453-463 ◽  
Author(s):  
Rodrigo Brincalepe Salvador ◽  
Daniel C. Cavallari
Keyword(s):  
Dna Sequences ◽  
Taxonomic Revision ◽  
Junior Synonym ◽  
Valid Species ◽  
Eastern Brazil ◽  
The Family ◽  
North Eastern ◽  
Fernando De Noronha ◽  
Living Species

The genus Hyperaulax Pilsbry, 1897 comprises two living species endemic to the oceanic Fernando de Noronha Archipelago, off north-eastern Brazil. They are currently allocated in two subgenera, Hyperaulax s. str. and Bonnanius Jousseaume, 1900, belonging to the family Odontostomidae. Herein we present a taxonomic revision of these species, assessing their familiar allocation within Orthalicoidea, offering updated diagnoses and descriptions, figuring the type materials and further relevant specimens, and providing barcoding DNA sequences. We conclude that Bonnanius is a junior synonym of Hyperaulax, which is classified in Odontostomidae. The genus contains two valid species, H. ridleyi and H. ramagei, both endemic to Fernando de Noronha.

scholarly journals A catch-all leguminous tree: Erythrina velutina visited and pollinated by vertebrates at an oceanic island

2009 ◽  
Vol 57 (1) ◽  
pp. 26 ◽  
Author(s):  
Ivan Sazima ◽  
Cristina Sazima ◽  
Marlies Sazima
Keyword(s):  
Water Balance ◽  
Food Source ◽  
Oceanic Island ◽  
Leguminous Tree ◽  
Dual Purpose ◽  
Eastern Brazil ◽  
North Eastern ◽  
Fernando De Noronha ◽  
Small Vertebrate ◽  
Vertebrate Assemblage

Species of the pantropical genus Erythrina (Fabaceae) are visited by perching and/or hovering birds in the mainland. At the oceanic island of Fernando de Noronha, north-eastern Brazil, we found that Erythrina velutina Willd. blooms during the dry season and the flowers are visited by a small vertebrate assemblage. Flowers last 2 days and their stigmas remain receptive, although only first-day flowers produce nectar. Nectar is dilute and produced copiously. All terrestrial native vertebrates (three of them endemics), the dove Zenaida auriculata noronha, the perching birds Vireo gracilirostris and Elaenia ridleyana, and the lizard Euprepis atlanticus are regular visitors and pollinators. The features of E. velutina conform to those of passerine-pollinated species within the genus. Its nectar is a resource sought by the vertebrates, which visit the inflorescences from dawn to sunset. Since none of the visitors depends on nectar as a major food source, the flowers are likely to serve a dual purpose, i.e. water balance and energy intake, similarly to the findings for some Erythrina species in Neotropic and Palaeotropic mainlands. However, E. velutina is the only species within the genus that is visited and pollinated by doves and lizards.

Taxonomy of Plakortis and Plakinastrella (Demospongiae: Plakinidae) from oceanic islands off north-eastern Brazil, with description of three new species

2003 ◽  
Vol 83 (2) ◽  
pp. 385-397 ◽  
Author(s):  
Fernando C. Moraes ◽  
Guilherme Muricy
Keyword(s):  
New Species ◽  
Morphological Characters ◽  
Oceanic Islands ◽  
Western Atlantic ◽  
Eastern Brazil ◽  
North Eastern ◽  
Fernando De Noronha ◽  
Plakortis Angulospiculatus ◽  
Three New Species ◽  
Shape And Size

Three species of Plakortis and one of Plakinastrella (Demospongiae: Homosclerophorida) collected mostly at oceanic islands off north-eastern Brazil (Atol das Rocas, Fernando de Noronha and São Pedro e São Paulo Archipelago) are described, three of which are new to science: Plakortis angulospiculatus, P. insularis sp. nov., P. microrhabdifera sp. nov, and Plakinastrella microspiculifera sp. nov. External morphological characters such as colour, oscules, and consistency are sufficient to discriminate all the four species in the field, except Plakortis angulospiculatus from P. microrhabdifera. Internal features such as skeletal arrangement, shape and size of diods, and presence of microrhabds and calthrops are also important taxonomic characters for western Atlantic Plakortis and Plakinastrella. We consider as valid only five species of Plakortis in the western Atlantic: the three species described here plus P. halichondrioides and P. zyggompha. All these species except P. zyggompha have been recorded from Brazil. Plakinastrella has now two species in the western Atlantic, P. onkodes and P. microspiculifera sp. nov. The generic distinction between Plakortis and Plakinastrella is tenuous, based only on the presence of spicule size-classes and of deformed vs normal calthrops, and both genera need detailed revision.

Chlorophyll a and nutrient distribution around seamounts and islands of the tropical south-western Atlantic

2013 ◽  
Vol 64 (2) ◽  
pp. 168 ◽  
Author(s):  
Christiane Sampaio de Souza ◽  
Joana Angélica Guimarães da Luz ◽  
Silvio Macedo ◽  
Manuel de Jesus Flores Montes ◽  
Paulo Mafalda
Keyword(s):  
Chlorophyll A ◽  
Large Scale ◽  
Saint Paul ◽  
Nutrient Concentrations ◽  
Nutrient Distribution ◽  
Western Atlantic ◽  
Eastern Brazil ◽  
Wide Range ◽  
North Eastern ◽  
Fernando De Noronha

Data collected on two large-scale surveys around the seamounts and islands off north-eastern Brazil during 1997 and 1998 provided information on the distribution of Chlorophyll a and inorganic nutrients. During both surveys, the concentrations of Chlorophyll a and nutrients were highly patchy. The highest measurement of Chlorophyll a was 3.91 µg L–1 during 1997. A wide range of nutrient concentrations were found, from undetectable values to a maximum of 17.52 µm L–1 (Si), 1.37 µm L–1 (PO4), 10.02 µm L–1 (NO3) and 0.72 µm L–1 (NO2). In 1998, concentrations of Chlorophyll a and nutrients (nitrite and nitrate) were far more uniform, with Chlorophyll a concentrations lower and phosphate concentrations generally higher than in 1997. Topography–flow interaction on thermohaline structures was observed around Saint Peter and Saint Paul Archipelago and in the Fernando de Noronha Chain, creating a patchy pattern around the island and seamounts. Nutrients exhibited an inverse linear relationship with temperature and salinity and an exponential decay relationship with Chlorophyll a.

scholarly journals Corrigendum to: A catch-all leguminous tree: Erythrina velutina visited and pollinated by vertebrates at an oceanic island

2009 ◽  
Vol 57 (7) ◽  
pp. 627 ◽  
Author(s):  
Ivan Sazima ◽  
Cristina Sazima ◽  
Marlies Sazima
Keyword(s):  
Water Balance ◽  
Food Source ◽  
Oceanic Island ◽  
Leguminous Tree ◽  
Dual Purpose ◽  
Eastern Brazil ◽  
North Eastern ◽  
Fernando De Noronha ◽  
Small Vertebrate ◽  
Vertebrate Assemblage

Species of the pantropical genus Erythrina (Fabaceae) are visited by perching and/or hovering birds in the mainland. At the oceanic island of Fernando de Noronha, north-eastern Brazil, we found that Erythrina velutina Willd. blooms during the dry season and the flowers are visited by a small vertebrate assemblage. Flowers last 2 days and their stigmas remain receptive, although only first-day flowers produce nectar. Nectar is dilute and produced copiously. All terrestrial native vertebrates (three of them endemics), the dove Zenaida auriculata noronha, the perching birds Vireo gracilirostris and Elaenia ridleyana, and the lizard Euprepis atlanticus are regular visitors and pollinators. The features of E. velutina conform to those of passerine-pollinated species within the genus. Its nectar is a resource sought by the vertebrates, which visit the inflorescences from dawn to sunset. Since none of the visitors depends on nectar as a major food source, the flowers are likely to serve a dual purpose, i.e. water balance and energy intake, similarly to the findings for some Erythrina species in Neotropic and Palaeotropic mainlands. However, E. velutina is the only species within the genus that is visited and pollinated by doves and lizards.

scholarly journals Corrigendum to: A catch-all leguminous tree: Erythrina velutina visited and pollinated by vertebrates at an oceanic island

2010 ◽  
Vol 58 (1) ◽  
pp. 80
Author(s):  
Ivan Sazima ◽  
Cristina Sazima ◽  
Marlies Sazima
Keyword(s):  
Water Balance ◽  
Food Source ◽  
Oceanic Island ◽  
Leguminous Tree ◽  
Dual Purpose ◽  
Eastern Brazil ◽  
North Eastern ◽  
Fernando De Noronha ◽  
Small Vertebrate ◽  
Vertebrate Assemblage

Species of the pantropical genus Erythrina (Fabaceae) are visited by perching and/or hovering birds in the mainland. At the oceanic island of Fernando de Noronha, north-eastern Brazil, we found that Erythrina velutina Willd. blooms during the dry season and the flowers are visited by a small vertebrate assemblage. Flowers last 2 days and their stigmas remain receptive, although only first-day flowers produce nectar. Nectar is dilute and produced copiously. All terrestrial native vertebrates (three of them endemics), the dove Zenaida auriculata noronha, the perching birds Vireo gracilirostris and Elaenia ridleyana, and the lizard Euprepis atlanticus are regular visitors and pollinators. The features of E. velutina conform to those of passerine-pollinated species within the genus. Its nectar is a resource sought by the vertebrates, which visit the inflorescences from dawn to sunset. Since none of the visitors depends on nectar as a major food source, the flowers are likely to serve a dual purpose, i.e. water balance and energy intake, similarly to the findings for some Erythrina species in Neotropic and Palaeotropic mainlands. However, E. velutina is the only species within the genus that is visited and pollinated by doves and lizards.

A new species of Stoeba (Demospongiae: Astrophorida) from oceanic islands off north-eastern Brazil

2007 ◽  
Vol 87 (6) ◽  
pp. 1387-1393 ◽  
Author(s):  
Fernando Moraes ◽  
Guilherme Muricy
Keyword(s):  
New Species ◽  
First Record ◽  
Oceanic Islands ◽  
Sao Paulo ◽  
Valid Species ◽  
Western Atlantic ◽  
Eastern Brazil ◽  
North Eastern ◽  
Fernando De Noronha ◽  
A New Species

The genus Stoeba has 11 recognized species. Herein we describe a new species of Stoeba endemic from two oceanic archipelagoes off north-eastern Brazil (Fernando de Noronha and São Pedro e São Paulo), constituting the first record of this genus for the western Atlantic. Stoeba latex sp. nov. is characterized by its thickly encrusting to massive shape, stretched surface, brownish-red colour, and spiculation of calthrops and sanidasters with well developed spines; dichotriaenes and oxeas are absent. Stoeba and Dercitus are very closely related genera, and should probably be merged. The genus Stoeba now contains the following valid species: S. dissimilis, S. exostotica, S. extensa, S. lesinensis, S. natalensis, S. occulta, S. pauper, S. plicata, S. reptans, S. simplex, S. syrmatita and S. latex sp. nov. Several other species still await description. A key to the valid species of Stoeba is given.

Taxonomy of Nystiellidae (Caenogastropoda, Epitonioidea) from Brazil, with description of three new species from the South-western Atlantic

2017 ◽  
Vol 98 (7) ◽  
pp. 1619-1644 ◽  
Author(s):  
Alexandre Dias Pimenta ◽  
Bruno Garcia Andrade ◽  
Ricardo Silva Absalão
Keyword(s):  
Rio Grande ◽  
Taxonomic Revision ◽  
South Atlantic ◽  
Shell Morphology ◽  
The South ◽  
Western Atlantic ◽  
North East ◽  
The North ◽  
Eastern Brazil ◽  
North Eastern

A taxonomic revision of the Nystiellidae from Brazil, including samples from the Rio Grande Rise, South Atlantic, was performed based on shell morphology. Five genera and 17 species were recognized. For the richest genus,Eccliseogyra, the three species previously recorded from Brazil were revised:E. brasiliensisandE. maracatu, previously known only from their respective type series, were re-examined. Newly available material ofE. maracatuexpanded the known geographic range of this species to off south-east Brazil.Eccliseogyra nitidais now recorded from north-eastern to south-eastern Brazil, as well as from the Rio Grande Rise. Three species ofEccliseogyraare newly recorded from the South Atlantic:E. monnioti, previously known from the north-eastern Atlantic, occurs off eastern Brazil and on the Rio Grande Rise; its protoconch is described for the first time, confirming its family allocation.Eccliseogyra pyrrhiasoccurs off eastern Brazil and on the Rio Grande Rise, andE. folinioff eastern Brazil. The genusIphitusis newly recorded from the South Atlantic.Iphitus robertsiwas found off northern Brazil, although the shells show some differences from the type material, with less-pronounced spiral keels. Additional new finds showed thatIphitus cancellatusranges from eastern Brazil to the Rio Grande Rise, and Iphitusnotiossp. nov. is restricted to the Rio Grande Rise.Narrimania, previously recorded from Brazil based on dubious records, is confirmed, including the only two living species described for the genus:N. azelotes, previously only known from the type locality in Florida, andN. concinna, previously known from the Mediterranean. A third species,Narrimania raquelaesp. nov. is described from eastern Brazil, diagnosed by its numerous and thinner cancellate sculpture. To the three species ofOpaliopsispreviously known from Brazil, a fourth species,O. arnaldoisp. nov., is added from eastern Brazil, and diagnosed by its very thin spiral sculpture, absence of a varix, and thinner microscopic parallel axial striae.Papuliscala nordestina, originally described from north-east Brazil, is recorded off eastern Brazil and synonymized withP. elongata, a species previously known only from the North Atlantic.

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