scholarly journals Gold mineralization in the Guiana Shield, Guiana and Suriname, South America: a field trip to the 14th biennial Society for Geology Applied to Mineral Deposits (SGA) meeting

2018 ◽  
Author(s):  
M Bardoux ◽  
M Moroney ◽  
F Robert
Keyword(s):  
South America ◽  
Gold Mineralization ◽  
Field Trip ◽  
Mineral Deposits ◽  
Guiana Shield

scholarly journals Human Q Fever on the Guiana Shield and Brazil: Recent Findings and Remaining Questions

2021 ◽  
Author(s):  
Loïc Epelboin ◽  
Carole Eldin ◽  
Pauline Thill ◽  
Vincent Pommier de Santi ◽  
Philippe Abboud ◽  
...  
Keyword(s):  
South America ◽  
Geographical Distribution ◽  
Coxiella Burnetii ◽  
French Guiana ◽  
Q Fever ◽  
Guiana Shield ◽  
Animal Reservoir ◽  
The World ◽  
Unique Strain ◽  
Amazonian Region

Abstract Purpose of Review In this review, we report on the state of knowledge about human Q fever in Brazil and on the Guiana Shield, an Amazonian region located in northeastern South America. There is a contrast between French Guiana, where the incidence of this disease is the highest in the world, and other countries where this disease is practically non-existent. Recent Findings Recent findings are essentially in French Guiana where a unique strain MST17 has been identified; it is probably more virulent than those usually found with a particularly marked pulmonary tropism, a mysterious animal reservoir, a geographical distribution that raises questions. Summary Q fever is a bacterial zoonosis due to Coxiella burnetii that has been reported worldwide. On the Guiana Shield, a region mostly covered by Amazonian forest, which encompasses the Venezuelan State of Bolivar, Guyana, Suriname, French Guiana, and the Brazilian State of Amapá, the situation is very heterogeneous. While French Guiana is the region reporting the highest incidence of this disease in the world, with a single infecting clone (MST 117) and a unique epidemiological cycle, it has hardly ever been reported in other countries in the region. This absence of cases raises many questions and is probably due to massive under-diagnosis. Studies should estimate comprehensively the true burden of this disease in the region.

scholarly journals The hidden anatomy of paranasal sinuses reveals biogeographically distinct morphotypes in the nine-banded armadillo (Dasypus novemcinctus)

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3593 ◽  
Author(s):  
Guillaume Billet ◽  
Lionel Hautier ◽  
Benoit de Thoisy ◽  
Frédéric Delsuc
Keyword(s):  
South America ◽  
Paranasal Sinuses ◽  
Morphological Diversity ◽  
Distinct Species ◽  
Molecular Data ◽  
Morphological Data ◽  
Diagnostic Feature ◽  
Guiana Shield ◽  
Diagnostic Features ◽  
Continental Scale

BackgroundWith their Pan-American distribution, long-nosed armadillos (genusDasypus) constitute an understudied model for Neotropical biogeography. This genus currently comprises seven recognized species, the nine-banded armadillo (D. novemcinctus) having the widest distribution ranging from Northern Argentina to the South-Eastern US. With their broad diversity of habitats, nine-banded armadillos provide a useful model to explore the effects of climatic and biogeographic events on morphological diversity at a continental scale.MethodsBased on a sample of 136 skulls ofDasypusspp. belonging to six species, including 112 specimens identified asD. novemcinctus, we studied the diversity and pattern of variation of paranasal cavities, which were reconstructed virtually using µCT-scanning or observed through bone transparency.ResultsOur qualitative analyses of paranasal sinuses and recesses successfully retrieved a taxonomic differentiation between the traditional speciesD. kappleri,D. pilosusandD. novemcinctusbut failed to recover diagnostic features between the disputed and morphologically similarD. septemcinctusandD. hybridus. Most interestingly, the high variation detected in our large sample ofD. novemcinctusshowed a clear geographical patterning, with the recognition of three well-separated morphotypes: one ranging from North and Central America and parts of northern South America west of the Andes, one distributed across the Amazonian Basin and central South America, and one restricted to the Guiana Shield.DiscussionThe question as to whether these paranasal morphotypes may represent previously unrecognized species is to be evaluated through a thorough revision of theDasypusspecies complex integrating molecular and morphological data. Remarkably, our recognition of a distinct morphotype in the Guiana Shield area is congruent with the recent discovery of a divergent mitogenomic lineage in French Guiana. The inflation of the second medialmost pair of caudal frontal sinuses constitutes an unexpected morphological diagnostic feature for this potentially distinct species. Our results demonstrate the benefits of studying overlooked internal morphological structures in supposedly cryptic species revealed by molecular data. It also illustrates the under-exploited potential of the highly variable paranasal sinuses of armadillos for systematic studies.

Lectotypification of two Stegolepis names (Rapateaceae)

Phytotaxa ◽  
2018 ◽  
Vol 347 (1) ◽  
pp. 96
Author(s):  
RODRIGO SCHÜTZ RODRIGUES
Keyword(s):  
South America ◽  
Guiana Shield ◽  
Brazilian Amazonia ◽  
Northern South America ◽  
Floristic Studies

Stegolepis Klotzsch ex Körnicke (1872: 480) is the largest genus of Rapateaceae and comprises 33 species endemic to the Guiana Shield in northern South America (Berry 2004). Most Stegolepis names have no problems concerning their typification. However, as part of ongoing floristic studies on the Rapateaceae of the Brazilian Amazonia and adjacent Guiana Shield areas (Rodrigues & Flores 2010, 2017; Rodrigues 2017), I found that two early names of Stegolepis are in need of lectotypification.

Lithostratigraphy, geochronology and gold metallogeny in the northern Guiana Shield, South America: a review

2001 ◽  
Vol 18 (3-4) ◽  
pp. 211-236 ◽  
Author(s):  
Gabriel Voicu ◽  
Marc Bardoux ◽  
Ross Stevenson
Keyword(s):  
South America ◽  
Guiana Shield

scholarly journals Our common future? Cross-scalar scenario analysis for social–ecological sustainability of the Guiana Shield, South America

2014 ◽  
Vol 44 ◽  
pp. 126-148 ◽  
Author(s):  
Jayalaxshmi Mistry ◽  
Céline Tschirhart ◽  
Caspar Verwer ◽  
Rob Glastra ◽  
Odacy Davis ◽  
...  
Keyword(s):  
South America ◽  
Scenario Analysis ◽  
Ecological Sustainability ◽  
Guiana Shield ◽  
Social Ecological ◽  
Common Future

scholarly journals Generic additions to the Rapateaceae of Rondônia, Brazil

2017 ◽  
Vol 47 (2) ◽  
pp. 95-102
Author(s):  
Rodrigo Schütz RODRIGUES
Keyword(s):  
South America ◽  
Geographical Distribution ◽  
The State ◽  
Guiana Shield ◽  
White Sand ◽  
Brazilian State ◽  
Northern Brazil ◽  
Family Centered ◽  
Sand Ecosystems

ABSTRACT Rapateaceae is a monocot family centered in the Guiana Shield region of South America. This article reports four generic additions to the Rapateaceae of Rondônia, a state in northern Brazil. Cephalostemon gracilis (Poepp. & Endl.) R.H.Schomb., Duckea cyperaceoidea (Ducke) Maguire, Monotrema xyridoides Gleason, and Schoenocephalium cucullatum Maguire were recorded in lowland savannas and open white-sand ecosystems in the state. These findings extend significantly the known diversity of the Rapateaceae taxa occurring in Rondônia, and represent an extension of their geographical distribution to a Brazilian state with no part of its territory in the Guiana Shield.

scholarly journals The Mineral Deposits of South America

Science ◽  
1919 ◽  
Vol 49 (1274) ◽  
pp. 518-519
Author(s):  
A. Knopf
Keyword(s):  
South America ◽  
Mineral Deposits

A new abnormality record in bats: a teratological condition or skull trauma due to tooth avulsion in Noctilio leporinus?

Mammalia ◽  
2018 ◽  
Vol 82 (5) ◽  
pp. 494-499 ◽  
Author(s):  
Víctor Romero ◽  
Scott C. Pedersen
Keyword(s):  
South America ◽  
Tooth Decay ◽  
Guiana Shield ◽  
Alveolar Process ◽  
Tooth Avulsion ◽  
Periodontal Inflammation ◽  
Initial Injury ◽  
Subsequent Loss ◽  
Skull Trauma ◽  
Skeletal Deformations

Abstract Here we report on a skull of an adult male Noctilio leporinus caught in the Guiana Shield, South America. The animal was lacking the upper left molar-row and exhibited skeletal deformations in the rostral and palatal regions. This aberration could have been the result of a traumatic avulsion of the left C1. As a consequence of its position and depth of the root, the C1 avulsion could have broken much of the surrounding alveolar process during the initial injury, with subsequent loss of the remaining teeth via periodontal inflammation and tooth decay.

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