Do Environmental and Host Variables Influence the Parasite Community of Leptodactylus fuscus (Anura: Leptodactylidae) in the Amazon Region?

Abstract Parasites are an important part of biodiversity, and knowledge of species and their relationship with their hosts helps in monitoring an ecosystem over time. The aim of this study was to investigate the fauna of metazoan parasites in Hemiodus unimaculatus from the Jari River, in the eastern Amazon region, northern Brazil. Of the fish examined, 96.7% were parasitized by one or more species, and a total of 336 parasites such as Dactylogyridae gen. sp.1, Dactylogyridae gen. sp.2, Dactylogyridae gen. sp.3, Dactylogyridae gen. sp.4, Gyrodactilydae gen. sp., Urocleidoides sp.1, Urocleidoides sp.2, Urocleidoides sp.3, metacercariae of Digenea gen. sp., Procamallanus (Spirocamallanus) inopinatus, Contracaecum sp., Neoechinorhynchus sp. and Acarina gen. sp. The parasite community showed low Brillouin diversity (0.58 ± 0.29), low evenness (0.44 ± 0.21) and low species richness (7.40 ± 3.83). There was a predominance of ectoparasites, mainly monogeneans and digeneans. The parasites showed an aggregate dispersion, except for P. (S.) inopinatus, which had a random dispersion. The size of the hosts had no effect on diversity, species richness and abundance of parasites, but other factors structured the parasite community. This is the first study on the parasite community and infracommunities in H. unimaculatus.

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Socioeconomic and health profile of workers in industries of the Amazon region

Panorama brasileiro de tungstênio (w) entre os anos de 2008 e 2014 ◽

10.32749/nucleodoconhecimento.com.br/health/employees-industries-amazonica ◽

2016 ◽

Vol 10 (11) ◽

pp. 73-86

Author(s):

Rodrigo Canto Moreira ◽

Carla Viana Dendasck ◽

Ciane Martins de Oliveira ◽

Cláudio Alberto Gellis de Mattos Dias ◽

Amanda Alves Fecury ◽

...

Keyword(s):

Amazon Region ◽

Health Profile

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MODEC2017, International Workshop on the Natural Products and Agro-Industrial Processes in Ecuadorian Amazon region

10.3390/mol2net-02-13001 ◽

2016 ◽

Author(s):

Amaury Pérez Martínez ◽

Oscar Miguel Rivera-Borroto ◽

Gerardo M. Casañola-Martín ◽

Karel Dieguez Santana

Keyword(s):

Natural Products ◽

International Workshop ◽

Amazon Region ◽

Industrial Processes ◽

Ecuadorian Amazon

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Faculty Opinions recommendation of Endemic eastern equine encephalitis in the Amazon region of Peru.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.1066838.519781 ◽

2007 ◽

Author(s):

Edward Hayes

Keyword(s):

Amazon Region ◽

Eastern Equine Encephalitis

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Faculty Opinions recommendation of Species interactions in a parasite community drive infection risk in a wildlife population.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.7412956.7693054 ◽

2010 ◽

Author(s):

Nigel Yoccoz

Keyword(s):

Species Interactions ◽

Parasite Community ◽

Infection Risk ◽

Wildlife Population

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The Amazon Region; A Vision of Sovereignty

10.21236/ada346259 ◽

1998 ◽

Author(s):

Eduardo J. Barbosa

Keyword(s):

Amazon Region

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Late-Holocene palaeoenvironmental reconstruction from a lake in the Amazon Rainforest-Tropical Savanna (Cerrado) boundary in Brazil using a multi-proxy approach

The Holocene ◽

10.1177/09596836211019091 ◽

2021 ◽

pp. 095968362110190

Author(s):

Kury Milena Souza ◽

Moreira Luciane Silva ◽

Cordeiro Renato Campello ◽

Sifeddine Abdelfettah ◽

Turcq Bruno ◽

...

Keyword(s):

Late Holocene ◽

Amazon Region ◽

Amazon Rainforest ◽

Oxbow Lake ◽

Tropical Savanna ◽

Sedimentary Process ◽

Climatic Fluctuations ◽

Climate Conditions ◽

Depositional Processes ◽

Lake Formation

As an ecotone, the region between the Amazon Rainforest and Tropical Savanna (Cerrado) biomes is, by definition, more susceptible to climate change. Therefore, understanding palaeoenvironmental dynamics is essential to address the future responses of such transition areas to climatic fluctuations. In this context, we present a new sediment record for the Late-Holocene retrieved from Barro-Preto, currently an oxbow lake located in an ecotone at the southern Brazilian Amazon border. Our multi-proxy data include carbon and nitrogen isotopes, as well as bulk TOC, chlorophyll derivatives, grain-size and microcharcoal analyses, all anchored on a radiocarbon-dated chronology. The sedimentary process recorded at the Barro-Preto Lake responded to both local and regional climate dynamics. It was influenced by river excursions associated to local responses to precipitation changes by the activation of the palaeochannel connecting the main-stem river and the Barro-Preto lake. This activation was evidenced by the presence of different colour lithology laminations accompanied by coarser sediments and also by climate conditions known to influence the Amazon region. Depositional processes linked to lake dynamics and different oxbow lake cycle stages were also important to explain the changes verified in the Barro-Preto record, endorsing the use of this lake formation for palaeoclimatic reconstructions. The record indicated a rising humidity trend, reflected by a progressive increase in lacustrine productivity, in accordance to other studies carried out in the Amazon region concerning the Late-Holocene, associated with a more southward displacement of the Intertropical Convergence Zone. Despite this rising humidity trend, dry episodic events during the Late-Holocene were evidenced by charcoal data, also coherent with regional Amazon studies, albeit exhibiting increased intensity, suggesting that the transitional nature of the environment might have influenced susceptibility to fires.

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Application of Construction and Demolition Waste in Civil Construction in the Brazilian Amazon—Case Study of the City of Rio Branco

Materials ◽

10.3390/ma14092247 ◽

2021 ◽

Vol 14 (9) ◽

pp. 2247

Author(s):

Fernando da Silva Souza ◽

José Maria Franco de Carvalho ◽

Gabriela Grotti Silveira ◽

Vitória Cordeiro Araújo ◽

Ricardo André Fiorotti Peixoto

Keyword(s):

Mechanical Strength ◽

Raw Materials ◽

Amazon Region ◽

Construction And Demolition Waste ◽

Recycled Aggregates ◽

Federal State ◽

Construction Sites ◽

Demolition Waste ◽

Conventional Concrete ◽

Initial Adhesion

The lack of usable aggregates for civil construction in Rio Branco (capital of Acre, a Federal State in the Amazon region) makes the production and use of recycled aggregates from construction and demolition waste (CDW) an alternative of great interest. In this study, a comprehensive characterization of CDW collected from 24 construction sites of six building types and three different construction phases (structures, masonry, and finishing) was carried out. The fine and coarse recycled aggregates were produced and evaluated in 10 different compositions. The aggregates’ performance was evaluated in four mixtures designed for laying and coating mortars with a total replacement of conventional aggregates and a mixture designed for a C25 concrete with 50% and 100% replacement of conventional aggregates. CDW mortars showed lower densities and greater water retention, initial adhesion, and mechanical strength than conventional mortars. CDW concretes presented lower densities and greater resistance to chloride penetration than conventional concrete, with a small mechanical strength reduction. The recycled CDW aggregates proved to be technologically feasible for safe application in mortars and concrete; for this reason, it is believed that the alternative and proposed methodology is of great interest to the Amazonian construction industry, considering the high costs of raw materials and the need for defining and consolidating a sustainable development model for the Amazon region.

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