Length-weight relationships in seven ornamental freshwater species of Characiformes from the Unini River basin (Brazilian Amazon)

2018 ◽  
Vol 34 (5) ◽  
pp. 1188-1191 ◽  
Author(s):  
Thiago Fonseca de Barros ◽  
Bruno Barros Althoff ◽  
Douglas Costa Pereira ◽  
Henrique Lazzarotto ◽  
Érica Pellegrini Caramaschi
Keyword(s):  
River Basin ◽  
Brazilian Amazon ◽  
Freshwater Species

scholarly journals Trends in climate extreme indices assessed in the Xingu river basin - Brazilian Amazon

2021 ◽  
Vol 31 ◽  
pp. 100306
Author(s):  
Edmundo Wallace Monteiro Lucas ◽  
Francisco de Assis Salviano de Sousa ◽  
Fabrício Daniel dos Santos Silva ◽  
Rodrigo Lins da Rocha Júnior ◽  
David Duarte Cavalcante Pinto ◽  
...  
Keyword(s):  
River Basin ◽  
Brazilian Amazon ◽  
Climate Extreme ◽  
Xingu River ◽  
Extreme Indices

A new species of Mastiglanis Bockmann 1994 (Siluriformes: Heptapteridae) from the Amazon River basin, Peru

Zootaxa ◽  
2020 ◽  
Vol 4820 (2) ◽  
pp. 323-336
Author(s):  
DARIO R. FAUSTINO-FUSTER ◽  
HERNÁN ORTEGA
Keyword(s):  
New Species ◽  
River Basin ◽  
Morphological Analysis ◽  
Valid Species ◽  
Amazon River ◽  
Freshwater Species ◽  
X Rays ◽  
Amazon River Basin ◽  
A New Species ◽  
Pelvic Fin

Mastiglanis is a genus of heptapterid catfish represented by two valid species. These freshwater species are widely distributed along the Amazon, Orinoco, and Maroni River basins. However, a taxonomic review of specimens collected in the Putumayo and Nanay rivers, Amazon River basin in Peru revealed a new species of Mastiglanis. A morphological analysis was completed for morphometric (36 measurements) and meristic (20 counts) data. Osteological counts and descriptions were made from clear and stained specimens and x-rays images. The new species of Mastiglanis differs from M. asopos and M. durantoni by having a long pelvic fin, short snout, eight branched anal-fin rays, and a higher number of vertebrae and gill rakers. The distribution of the new species is restricted to the upper Amazon River basin.

scholarly journals Surface water quality and deforestation of the Purus river basin, Brazilian Amazon

2016 ◽  
Vol 9 (1) ◽  
pp. 81-88 ◽  
Author(s):  
Eduardo Antonio Ríos-Villamizar ◽  
Maria T. F. Piedade ◽  
Wolfgang J. Junk ◽  
Andréa Viviana Waichman
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
River Basin ◽  
Surface Water Quality ◽  
Brazilian Amazon

scholarly journals Pinnularia caprichosa sp. nov.: a diatom from a black water Brazilian Amazon system

Phytotaxa ◽  
2015 ◽  
Vol 239 (3) ◽  
pp. 280 ◽  
Author(s):  
Andreia Cavalcante Pereira ◽  
Lezilda Carvalho Torgan ◽  
Ana Luiza Burliga ◽  
John Patrick Kociolek ◽  
Carlos E. Wetzel ◽  
...  
Keyword(s):  
New Species ◽  
River Basin ◽  
Amazon Basin ◽  
Brazilian Amazon ◽  
New Taxon ◽  
Middle Portion ◽  
Black Water ◽  
Negro River ◽  
Electron Microscopical ◽  
Scanning Electron

While possessing a remarkable diversity in the acidic and oligotrophic waters of the Amazon basin, the genus Pinnularia appears underdescribed in the region. In this study, we present light and scanning electron microscopical observations on Pinnularia caprichosa sp. nov. from Tupé Lake, a dendritic lake located on the floodplain of the Negro River basin. This new taxon has a large axial area and transapical striae that are slightly radiate to parallel and longer in the middle portion of the valve. The species was compared with Pinnularia elliptica, P. instabilis, P. lacunarum, P. montana, P. permontana and P. subflexuosa, all of which closely resemble P. caprichosa but differ from the new species in specific details of size, striae density and valve shape.

Selenium Levels in the Whole Blood of Children and Teenagers from Two Riparian Communities at the Madeira River Basin in the Western Brazilian Amazon

2016 ◽  
Vol 175 (1) ◽  
pp. 87-97 ◽  
Author(s):  
Claudia M. Vega ◽  
José M. Godoy ◽  
Paulo R. G. Barrocas ◽  
Rodrigo A. Gonçalves ◽  
Beatriz F. A. De Oliveira ◽  
...  
Keyword(s):  
River Basin ◽  
Whole Blood ◽  
Brazilian Amazon ◽  
Madeira River ◽  
Madeira River Basin ◽  
Riparian Communities

Total and methyl mercury distribution in water, sediment, plankton and fish along the Tapajós River basin in the Brazilian Amazon

Chemosphere ◽  
2019 ◽  
Vol 235 ◽  
pp. 690-700 ◽  
Author(s):  
A.S. Lino ◽  
D. Kasper ◽  
Y.S. Guida ◽  
J.R. Thomaz ◽  
O. Malm
Keyword(s):  
River Basin ◽  
Methyl Mercury ◽  
Brazilian Amazon ◽  
Mercury Distribution

A new Planothidium species (Achnanthidiaceae, Bacillariophyceae) from Xingu Ria, Amazon River basin, Brazil

Phytotaxa ◽  
2020 ◽  
Vol 477 (2) ◽  
pp. 194-204
Author(s):  
KRYSNA S. MORAIS ◽  
LÍVIA F. COSTA ◽  
CARLOS E. DE M. BICUDO ◽  
LUC ECTOR ◽  
CARLOS E. WETZEL
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
River Basin ◽  
Brazilian Amazon ◽  
Diatom Species ◽  
Amazon River Basin ◽  
Sediment Samples ◽  
Xingu River ◽  
Scanning Electron

A new Planothidium species was found in sediment samples (~4,000 yr BP) from the Xingu Ria (Xingu River), Brazilian Amazon. The new species morphology was analyzed using light and scanning electron microscopy. Planothidium xinguense sp. nov., is mainly characterized by its elliptical, slightly asymmetrical valves, with strongly marked short rostrate ends in the small specimens, while long and strongly rostrate apices are observable in the larger valves. The taxon belongs to the group of species bearing a cavum on the rapheless valves around the name “Planothidium rostratum sensu lato”. Morphology and ecology of the new species is compared with that of morphologically related taxa. Information of core chronology and the co-occurrence of other diatom species in the sample is also provided.

scholarly journals THE EFECTS OF SETTLEMENT ON THE PREVALENCE OF AscarisINFECTION IN TWO AMERINDIAN POPULATIONS OF THE BRAZILIAN AMAZON

1993 ◽  
Vol 23 (1) ◽  
pp. 25-35 ◽  
Author(s):  
Janet M. CHERNELA ◽  
Vernon E. THATCHER
Keyword(s):  
River Basin ◽  
Ascaris Lumbricoides ◽  
Environmental Contamination ◽  
Close Contact ◽  
Intestinal Parasites ◽  
Nematode Species ◽  
Brazilian Amazon ◽  
Necator Americanus ◽  
Fishing Villages ◽  
The Third

Studies were made of the intestinal parasites of Amerindian populations of the Uaupes River basin of Brazil. Three groups were sampled: 1) Tukano fisher-agriculturalists who live in permanent riverine villages; 2) Maku hunter-horticulturalists who live in close contact with the Tukano fishing villages; and 3) Maku who inhabit the forest interior and have little contact with permanent settlements. Fecal samples were collected from 498 individuals of which 220 were from the first group, 135 from de second and 143 from the third. The samples were analyzed by means of microflotation and centrifugal sedimentation. A total of 18 protozoan and helminth species were recorded based on the presence of cysts or eggs. These included five nematode species that could not be identified. The three common pathogenic nematodes were found to be prevalent: the hookworm, Necator americanus(96%); the whipworm, Trichuris trichiura(77%) and the large roundworm, Ascaris lumbricoides(75%). The prevalence of Ascarisamong the villages was found to vary from 56 to 100%. Individuals living in, or associated with, permanent settlements had higher prevalence and intensity rates than those living in the nomadic hunter-gatherer way. This is shown to be directly related to fecal contamination of the environment in and around permanent settlements. The prevalence of Ascarisin a population can be used as an indicator of such environmental contamination.

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