scholarly journals Spatial distribution of pollen grains and spores in surface sediments of Guanabara Bay, Rio de Janeiro, Brazil

2012 ◽  
Vol 84 (3) ◽  
pp. 627-644 ◽  
Author(s):  
Cintia F. Barreto ◽  
Claudia G. Vilela ◽  
José A. Baptista-Neto ◽  
Ortrud M. Barth
Keyword(s):  
Rio De Janeiro ◽  
Surface Sediments ◽  
Pollen Grains ◽  
Source Area ◽  
Guanabara Bay ◽  
Differential Distribution ◽  
Hydrographic Basin ◽  
River Transport ◽  
Pollen Types ◽  
Janeiro State

Aiming to investigate the deposition of pollen grains and spores in Guanabara Bay, Rio de Janeiro State, 61 surface sediment samples were analyzed. The results showed that the current deposition of palynomorphs in surface sediments of Guanabara Bay represents the regional vegetation of this hydrographic basin. The differential distribution of palynomorphs followed a pattern influenced by bathymetry, tidal currents speed, discharge of numerous rivers, and by human activity. The dominance of representatives of Field Vegetation reflects the changes of the original flora caused by intense human activities in the region. The continued presence and richness of pollen types of rain forest in the samples indicates that their source area might be the vegetation from riparian border of rivers in the western sector of the Bay, where the mangrove vegetation is being preserved. The large amount of damaged palynomorphs may be related to abrasion that occurs during river transport, indicating removal or reworking from their areas of origin.

scholarly journals Modern processes of palynomorph deposition at lakes of the northern region of the Rio de Janeiro State, Brazil

2010 ◽  
Vol 82 (3) ◽  
pp. 679-690 ◽  
Author(s):  
Cynthia F.P. da Luz ◽  
Ortrud M. Barth ◽  
Cleverson G. Silva
Keyword(s):  
Rio De Janeiro ◽  
Mechanical Damage ◽  
Pollen Grains ◽  
Northern Region ◽  
Palynological Analysis ◽  
The North ◽  
Pollen Types ◽  
Lake Bottom ◽  
Superficial Sediments ◽  
Janeiro State

Palynological analysis of pollen, Pteridophyta spores and algae deposited in the superficial sediments at Lagoa de Cima and Lagoa do Campelo Lakes, located in the north of Rio de Janeiro state, was used to determine the spatial variation of the palynomorphs deposition. A total of 67 pollen types were identified at Lagoa de Cima, with an expressive contribution of regional arboreous taxa, hydrophytes and ruderal plants of the pastureland. The depositional pattern of palynomorphs depends on the fluvial leakage, the proximity of the local sedimentation to the inlet of the Imbé and Urubu Rivers and the bathymetry of lake bottom. The highest concentrations of palynomorphs were observed in the decentralized and less deeper area, without the interference of the northeastern wind. At Lagoa do Campelo, a total of 58 pollen types were identified, among which the majority of the pollen grains came from hydrophytes, with the highest concentrations found along the northeastern shore. The southeastern shore showed high percentages of pollen and spores with degraded exine and mechanical damage, due to the transport through the lakeby the currents caused by the wind, confirmed by the depositional trend of damaged palinomorphs along the same direction as the prevailing winds.

scholarly journals Geochronology and heavy metal flux to Guanabara bay, Rio de Janeiro state: a preliminary study

2013 ◽  
Vol 85 (4) ◽  
pp. 1317-1327 ◽  
Author(s):  
Jose A. Baptista Neto ◽  
Tomas C.S. Peixoto ◽  
Bernard J. Smith ◽  
John J. Mcalister ◽  
Soraya M. Patchineelam ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Organic Carbon ◽  
Rio De Janeiro ◽  
Industrial Effluents ◽  
Detailed Examination ◽  
210Pb Dating ◽  
Guanabara Bay ◽  
Negative Effect ◽  
Northern Portion ◽  
Janeiro State

Guanabara Bay, located in Rio de Janeiro state. It is surrounded by the second most important metropolitan area of the country. Over recent decades, land disturbance and urbanization in the surrounding area has significantly increased sediment input to the bay and had a negative effect on its overall environmental. This is especially related to high volumes of untreated sewage and industrial effluents. This study evaluates the history of this human impact through detailed examination of a sediment core taken from the northern portion of Guanabara Bay. A geochronology is established using 210Pb dating and related to organic carbon and heavy metal fluxes to the sediments. This gave a calculated net average sedimentation rate for the core of 0.67 cm.year-1. The organic carbon and heavy metals flux started to increase at the beginning of the last century and the highest values was observed in the top of the cores.

A new catfish species of Microcambeva Costa & Bockmann 1994 (Siluriformes: Trichomycteridae) from a coastal basin in Rio de Janeiro State, southeastern Brazil

Zootaxa ◽  
2020 ◽  
Vol 4895 (1) ◽  
pp. 111-123
Author(s):  
LUCAS SILVA DE MEDEIROS ◽  
CRISTIANO RANGEL MOREIRA ◽  
MÁRIO DE PINNA ◽  
SERGIO MAIA QUEIROZ LIMA
Keyword(s):  
New Species ◽  
Rio De Janeiro ◽  
Conservation Status ◽  
Southeastern Brazil ◽  
Guanabara Bay ◽  
Forest Remnant ◽  
Dorsal Process ◽  
The 19Th Century ◽  
Janeiro State ◽  
Coastal Basin

Microcambeva bendego, a small psammophilous catfish species, is described from the rio Guapi-Macacu basin at Guanabara Bay in Rio de Janeiro State, an Atlantic Forest remnant. This coastal drainage has been explored by several naturalists and fish researchers since the 19th century. It is a drainage with remarkably high endemism and species richness, and some recently-described and threatened species. The new species is distinguished from all congeners by two distinctive characters: long finger-like projections in the branchial isthmus and a large opercular patch of odontodes with 19 odontodes. Due to the paucity of specimens (n=3) osteological features of the new species were accessed by CT-Scan images of the holotype. Microcambeva bendego shares putative synapomorphies with two congeners, M. ribeirae and M. filamentosa, such as the fusion of supraorbital pore s6, the absence of ossification in the anterior autopalatine cartilage, the presence of an elongated and wide posterior process of the autopalatine, and a concavity on the dorsal process of the opercle. Those characters suggest that M. bendego is more closely related to those two species from the rio Ribeira de Iguape basin than to other congeners. The biogeography and conservation status of M. bendego are also discussed. 

scholarly journals ON THE POPULATION STRUCTURE OF Callinectes danae AND Callinectes ornatus (DECAPODA, PORTUNIDAE), IN GUANABARA BAY, RIO DE JANEIRO STATE, BRAZIL

Atlântica ◽  
2010 ◽  
Vol 32 (2) ◽  
pp. 151-161
Author(s):  
PATRICIA MARQUES GOLODNE ◽  
◽  
MARIA CRISTINA OSTROVSKI MATOS ◽  
MARCELO VIANNA
Keyword(s):  
Population Structure ◽  
Rio De Janeiro ◽  
Guanabara Bay ◽  
Janeiro State ◽  
Callinectes Danae

scholarly journals Spatial distribution of palynomorphs in the surface sediments of the Lagoa do Campelo lake, North region of Rio de Janeiro State, Brazil

2005 ◽  
Vol 19 (4) ◽  
pp. 741-752 ◽  
Author(s):  
Cynthia Fernandes Pinto da Luz ◽  
Ortrud Monika Barth ◽  
Cleverson Guisan Silva
Keyword(s):  
Spatial Distribution ◽  
Surface Sediments ◽  
Mechanical Damage ◽  
Pollen Grains ◽  
Pollen Grain ◽  
New Information ◽  
Lake Bottom ◽  
Wind Driven Currents ◽  
Trees And Shrubs ◽  
Janeiro State

Four samples of the surface sediments of the Lagoa do Campelo lake bottom were collected in a transect of 500 m by 500 m from edge to edge, in a northeast/southwest direction, the dominant wind direction in the region. The analysis of pollen grains, fern spores and algae were used to evaluate their spatial deposition and level of deterioration. In total, 58 types of pollen grains were identified, mainly from herbs as Cyperaceae, Poaceae and Typhaceae. Pollen grains occurred in all the analyzed sediments. The area of highest concentration was the northeast side of the lake. The southwest side showed the highest pollen grain and fern spore degradation and mechanical damage, probably as they were carried across the lake by wind-driven currents, confirming the depositional tendency of damaged palynomorphs in the same direction as the dominant wind. Among the pollen of trees and shrubs, Alchornea, Arecaceae, Cecropia, Celtis, Clethra and Myrtaceae were dominant at more than 1,000 pollen grains per gram of sediment. The quantity of fern spores was practically constant in all samples (± 10% of the total of palynomorphs). The algae Pediastrum tetras (Ehrenberg) Ralfs and Mougeotia occurred in all samples, but Spirogyra only in three of them. The results obtained gave new information about the richness, concentration and distribution of palynomorphs in the lake, representing the local and regional vegetation.

scholarly journals Recent benthic foraminifera from the Itaipu Lagoon, Rio de Janeiro (southeastern Brazil)

Check List ◽  
2016 ◽  
Vol 12 (5) ◽  
pp. 1959 ◽  
Author(s):  
Débora Raposo ◽  
Vanessa Laut ◽  
Iara Clemente ◽  
Virginia Martins ◽  
Fabrizio Frontalini ◽  
...  
Keyword(s):  
Benthic Foraminifera ◽  
Rio De Janeiro ◽  
Southeastern Brazil ◽  
Guanabara Bay ◽  
Foraminiferal Species ◽  
The City ◽  
Janeiro State

Itaipu Lagoon is located near the mouth of Guanabara Bay and has great importance for recreation to the city of Niterói, Rio de Janeiro state, Brazil. Several studies have documented foraminiferan diversity at Guanabara Bay, but none in Itaipu Lagoon. Therefore, this study lists and provides images of foraminiferal species collected from Itaipu Lagoon. A total of 35 species belonging to 23 genera were collected, grouped in 17 families and four orders. Ammonia tepida was the species with the highest occurrence. This study represents a baseline work for future investigations.

A mid-Holocene vegetational and anthropogenic record in the Guanabara Bay region, Rio de Janeiro State, SE Brazil, assessed by palynological and charcoal data

Grana ◽  
2016 ◽  
Vol 56 (4) ◽  
pp. 304-314 ◽  
Author(s):  
Cintia F. Barreto ◽  
Alex Da S. De Freitas ◽  
Taísa Camila S. De Souza ◽  
Claudia G. Vilela ◽  
Ortrud M. Barth ◽  
...  
Keyword(s):  
Rio De Janeiro ◽  
Guanabara Bay ◽  
Se Brazil ◽  
Janeiro State

scholarly journals Levantamento das cianobactérias psâmicas em sedimentos superficiais marginais da Lagoa Azul, Arraial do Cabo, Rio de Janeiro

2008 ◽  
Vol 31 (1) ◽  
pp. 24-29
Author(s):  
Loreine Hermida da Silva e Silva ◽  
Anderson Andrade Cavalcanti Iespa ◽  
Cynthia Moreira Damazio Iespa ◽  
Teresa Cristina Lopes Medeiros Faruolo
Keyword(s):  
Elevated Temperature ◽  
Coastal Area ◽  
Rio De Janeiro ◽  
Surface Sediments ◽  
High Salinity ◽  
Harsh Environment ◽  
The City ◽  
Plastic Containers ◽  
Opaque Plastic ◽  
Janeiro State

The coastal area of the Rio de Janeiro State presents a series of lagoons, dune fields and strand plains, which are the result of the paleogeographical evolution during Neogene. The lagoa Azul is situated at 22º56'52"S and 42º04'62"W in the Arraial do Cabo, located about 160 km far the city of Rio de Janeiro. It is a natural hypersaline coastal aquatic body which, parallel to Atlantic Ocean. The present work focused on the identification of psammic cyanobacteria in the surface sediments of the lagoa Azul. The samples were obtained by using plastic tubes and were later aconditiones in opaque plastic containers and conserved in a 4% solution of formaldehyde. With the material obtained, permanent slides were prepared so as to characterize them phycologically. Qualitative analysis showed the presence of 14 species and the occurrence of the families Chroococcaceae Nägeli 1849 (5 sp.), Phormidiaceae Anagnostidis & Komárek 1988 (4 sp.), Synechococcaceae Komárek & Anagnostidis 1995 (2 sp.), Nostocaceae Kützing 1843 (1 sp.), Oscillatoriaceae Gomont 1892 (1 sp.) and Pseudanabaenaceae Anagnostidis & Komárek 1988 (1 sp.). The incidence of these species is also recorded in other lagoons (Araruama, Pernambuco, Pitanguinha and Vermelha) in the northeast of Rio de Janeiro coast, such as the frequency of cyanobacteria is justified by the harsh environment, without predation, with high salinity, elevated temperature and low concentration of oxygen

scholarly journals Organochlorine pesticides (OCs) and polychlorinated biphenyls (PCBs) in sediments and crabs (Chasmagnathus granulata, Dana, 1851) from mangroves of Guanabara Bay, Rio de Janeiro State, Brazil

Chemosphere ◽  
2008 ◽  
Vol 73 (1) ◽  
pp. S186-S192 ◽  
Author(s):  
Alexandre Santos de Souza ◽  
João Paulo Machado Torres ◽  
Rodrigo Ornellas Meire ◽  
Rafael Curcio Neves ◽  
Márcia Souto Couri ◽  
...  
Keyword(s):  
Polychlorinated Biphenyls ◽  
Organochlorine Pesticides ◽  
Rio De Janeiro ◽  
Guanabara Bay ◽  
Chasmagnathus Granulata ◽  
Janeiro State
Sign in / Sign up

Export Citation Format

Share Document