Evolution of deepwater mixing and weathering inputs in the central Atlantic Ocean over the past 33 Myr by Frank, M, van de Flierdt, T, Halliday, A, Kubik, P, Hattendorf, B, Gunther, D

“…The distinct and relatively invariable Nd and Pb isotope records of deep waters in the fracture zones appear instead to have been controlled to a large extent by contributions from Saharan dust and the Orinoco/Amazon Rivers. Thus the previously observed similarity of Nd and Ph isotope time series from the western and eastern North Atlantic basins is better explainable by direct supply of Labrador Seawater to the eastern basin via a northern pathway rather than by advection of North Atlantic Deep Water via the Romanche and Vema Fracture Zones. …”

Lutzomyia umbratilis from an area south of the Negro River is refractory to in vitro interaction with Leishmania guyanensis by Rodrigo Pedro Soares, Paula Monalisa Nogueira, Nágila Francinete Secundino, Eric Fabrício Marialva, Cláudia Maria Ríos-Velásquez, Felipe Arley Costa Pessoa

“…BACKGROUND Lutzomyia umbratilis, the vector for Leishmania guyanensis in northern South America, has been found naturally infected with L. guyanensis only in areas north of the Negro and Amazon rivers. While populations of this sand fly species are also found in areas south of these rivers, these populations have never been reported to be infected and/or transmitting L. guyanensis. …”
Get full text

Litiges transfrontaliers sur le plateau des Guyanes, enjeux géopolitiques à l’interface des mondes amazoniens et caribéens by Gutemberg de Vilhena Silva

“…This connection add a layer of complexity in the negotiation of international limits, a relevant issue for the countries of the Guiana Shield, a geomorphological region located between the Orinoco and Amazon rivers. This shield contains the largest complex of uninterrupted and intact primary rainforest on Earth, oil, gold, diamonds and other natural resources. …”
Get full text

Trophic structure and mercury biomagnification in tropical fish assemblages, Iténez River, Bolivia. by Marc Pouilly, Danny Rejas, Tamara Pérez, Jean-Louis Duprey, Carlos I Molina, Cédric Hubas, Jean-Remy D Guimarães

“…We examined mercury concentrations in three fish assemblages to estimate biomagnification rates in the Iténez main river, affected by anthropogenic activities, and two unperturbed rivers from the Iténez basin, Bolivian Amazon. Rivers presented low to moderate water mercury concentrations (from 1.25 ng L(-1) to 2.96 ng L(-1)) and natural differences in terms of sediment load. …”
Get full text

New species of the Pseudancistrus barbatus group (Siluriformes, Loricariidae) with comments on its biogeography and dispersal routes by Gabriel da Costa e Silva, Fábio Roxo, Ricardo Britzke, Claudio Oliveira

“…The second hypothesis proposes that ancestral stock of the P. barbatus group was restricted to Guyana Shield rivers, and that headwater capture events permitted several dispersal routs through Guyana and Amazon rivers, permitted that the ancestral lineages of Pseudancistrus sp. …”
Get full text

Risks of dam construction for South American river dolphins: a case study of the Tapajós River by Pavanato, HJ, Melo-Santos, G, Lima, DS, Portocarrero-Aya, M, Paschoalini, M, Mosquera, F, Trujillo, F, Meneses, R, Marmontel, M, Maretti, C

“…Throughout this study, we identified low abundances of river dolphins compared to other Amazon rivers. Boto may not be sustainable at a population level, due primarily to population fragmentation which would result from the construction of the proposed dams. …”
Get full text

Proximate composition, fatty acids and physicochemical characteristics of artesian meal caribe (Serrasalmus rhombeus Pisces: Characidae) meal oil from Caicara del Orinoco-Venezuela by Douglas R. Belén-Camacho, David García, Mario José Moreno-Álvarez, Carlos Medina, Ángel Granados

“…Caribe (Serrasalmus rhoembeus) is a Characidae fish that lives in the basins of the Orinoco and Amazon rivers. It is an  underutilized specie although in the last years has been marketed in the form of of a meal which is obtained through a handmade process but without information about its chemical composition. …”
Get full text

Controls of Caribbean surface hydrology during the mid- to late Holocene: insights from monthly resolved coral records by C. Giry, T. Felis, M. Kölling, W. Wei, G. Lohmann, S. Scheffers

“…On interannual to multidecadal timescales, the systematic positive correlation observed between reconstructed sea surface temperature and salinity suggests that freshwater discharged from the Orinoco and Amazon rivers and transported into the Caribbean by wind-driven surface currents is a critical component influencing sea surface hydrology on these timescales.…”
Get full text

Smallholder agriculture results in stable forest cover in riverine Amazonia by Oliver T Coomes, Margaret Kalacska, Yoshito Takasaki, Christian Abizaid, Tristan Grupp

“…In this paper we assess forest disturbance and the dynamics of secondary forests around 275 communities along a 725 km transect on the Napo and Amazon Rivers in the Peruvian Amazon. We used high-resolution satellite imagery to define the ‘working area’ around each community, based on the spatial distribution of forest/field patches and the visible boundary between old-growth and secondary forests. …”
Get full text

Alexander von Humboldt’s Search for the Casiquiare Canal: by Jörn Seemann

“…Humboldt’s search for the connections between the watersheds of the Orinoco and the Amazon rivers and the resulting maps and drawings are used as an example to point out his cartographic impulse in his quest to understand and explain the physical world. …”
Get full text

Characteristics and Diurnal Cycle of GPM Rainfall Estimates over the Central Amazon Region by Rômulo Oliveira, Viviana Maggioni, Daniel Vila, Carlos Morales

“…This overestimation is particularly evident over the Negro, Solimões and Amazon rivers due to the poorly-calibrated algorithm over water surfaces. …”
Get full text

Distribuição de mercúrio total em sedimentos da plataforma continental Amazônica: Brasil Distribution of total mercury in sediments from Amazon continental shelf: Brazil by Gilmar W. Siqueira, Fabio M. Aprile

“…The results are inside of the background interval determined to not contaminated or not polluted Amazon Rivers, which the interval ranges from 0.05 to 0.28 mg kg-1. …”
Get full text

Análisis of major cations in bottom sediments from oil impacted Rivers, in the Ecuadorian Amazon by Cristina Gabriela Pérez Naranjo, Laurence Maurice, Valeria de Lourdes Ochoa-Herrera, Fausto López, David A. Egas, Christelle Lagane, Philippe Besson

“…In the sediment samples of the Northern Ecuadorian Amazon rivers, 43% Na, 93% Fe, 70% Mg, 62% Mn and 94% K are associated with the fine fraction. …”
Get full text

Avaliação da concentração de mercúrio em sedimentos e material particulado no rio Acre, estado do Acre, Brasil Mercury concentration assessment in botton sediments and suspended so... by Artur Fernando Silva Mascarenhas, Edilson da Silva Brabo, Alexandre Pessoa da Silva, Kleber de Freitas Fayal, Iracina Maura de Jesus, Elisabeth C. de Oliveira Santos

“…The mercury levels in the analyzed materials was below of standard levels for the non-polluted Amazon rivers. However complementary studies should be developed to elucidate the origin and the processes of mercury biodisponibility.…”
Get full text