Landscape and climate changes in southeastern Amazonia from Quaternary records of upland lakes

JTF Guimarães, PK Sahoo, PWM e Souza-Filho… - Atmosphere, 2023 - mdpi.com
The upland lakes (ULs) in Carajás, southeastern Amazonia, have been extensively studied
with respect to their high-resolution structural geology, geomorphology, stratigraphy …

Biogeochemical processes in canga ecosystems: Armoring of iron ore against erosion and importance in iron duricrust restoration in Brazil

EJ Gagen, A Levett, A Paz, M Gastauer, CF Caldeira… - Ore Geology …, 2019 - Elsevier
Supergene enriched iron ore deposits in Brazil are typically blanketed by goethite-cemented
breccias that form a protective duricrust known as canga. Moderately hard, well …

The role of protected and deforested areas in the hydrological processes of Itacaiúnas River Basin, eastern Amazonia

PRM Pontes, RBL Cavalcante, PK Sahoo… - Journal of environmental …, 2019 - Elsevier
To protect indigenous land and avoid the spread of deforestation in the Amazon, state and
federal Brazilian agencies recognized several protected areas since the 1990s. However …

Conservation implications of genetic structure in the narrowest endemic quillwort from the Eastern Amazon

J Dalapicolla, R Alves, R Jaffe… - Ecology and …, 2021 - Wiley Online Library
The quillwort Isoëtes cangae is a critically endangered species occurring in a single lake in
Serra dos Carajás, Eastern Amazon. Low genetic diversity and small effective population …

Comparative study on seasonal variations in physico-chemical characteristics of four soda lakes of Ethiopia (Arenguade, Beseka, Chitu and Shala)

H Melese, HJ Debella - Heliyon, 2023 - cell.com
Soda lakes are productive natural ecosystems with substantial economic and non-economic
values. Currently, they are facing considerable environmental threats that can lead to further …

Hydroclimate and vegetation changes in southeastern Amazonia over the past∼ 25,000 years

LS Reis, I Bouloubassi, M Mendez-Millan… - Quaternary Science …, 2022 - Elsevier
Stable isotope analysis of plant waxes (δ 13 C wax and δD wax) along with detailed pollen
data provide a new perspective on vegetation and precipitation variability in Serra Sul de …

Microbial weathering signatures in lateritic ferruginous duricrusts

A Levett, PM Vasconcelos, EJ Gagen, L Rintoul… - Earth and Planetary …, 2020 - Elsevier
Iron-rich duricrusts (canga) that blanket iron ore deposits in tropical regions in Brazil have a
complex formation and evolution. The direct role of microorganisms in the biogeochemical …

Mercury in multimedia system of Itacaiúnas Basin, Brazilian Amazon: An integrated approach to understand its distribution, origin, and ecological risk

PK Sahoo, R Dall'Agnol, GN Salomão… - Environmental …, 2023 - Elsevier
This study presents the first integrated study on total Hg (THg) level in surface soil (SS),
bottom soil (BS), stream sediments (SD), lake sediments (LS), stream water (SW), and lake …

Bacterioplankton communities in dissolved organic carbon-rich amazonian black water

FÉ Sylvain, S Bouslama, A Holland… - Microbiology …, 2023 - Am Soc Microbiol
ABSTRACT The Amazon River basin sustains dramatic hydrochemical gradients defined by
three water types: white, clear, and black waters. In black water, important loads of …

Biogeochemical cycling of iron: Implications for biocementation and slope stabilisation

A Levett, EJ Gagen, PM Vasconcelos, Y Zhao… - Science of the total …, 2020 - Elsevier
Microbial biofilms growing in iron-rich seeps surrounding Lake Violão, Carajás, Brazil serve
as a superb natural system to study the role of iron cycling in producing secondary iron …