Modelagem e Simulaçao do Escoamento e Dispersão Sazonais de Agentes Passivos no Rio Araguari AP: Cenários para o AHE Ferreira Gomes-I-Amapá/Brasil

Cunha, Alan Cavalcanti da; Cunha, Helenilza Ferreira Albuquerque; Pinheiro, Luis Aramis dos Reis

doi:10.21168/rbrh.v18n1.p67-85

Cited by 16 publications

(11 citation statements)

References 5 publications

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“…In the Amazon region, seasonality influenced by precipitation is characterized by two cycles, the rainy and dry season (Souza & Cunha, 2010;Cunha et al, 2013). These seasonal dynamics greatly influence in ichthyofauna community structures (Galacatos et al, 2004) and can also influence infracommunities of parasites in fish populations.…”

Section: Introductionmentioning

confidence: 99%

First study on infestation of Excorallana berbicensis (Isopoda: Corallanidae) on six fishes in a reservoir in Brazilian Amazon during dry and rainy seasons

Gentil-Vasconcelos

Tavares‐Dias²

2017

Lat. Am. J. Aquat. Res.

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We analyzed the infestation levels of Excorallana berbicensis on Acestrorhynchus falcirostris, Ageneiosus ucayalensis, Geophagus proximus, Hemiodus unimaculatus, Psectrogaster falcata and Serrasalmus gibbus in a reservoir in the Araguari River basin, northern Brazil, during the dry and rainy seasons. For P. falcata, the infestation levels due to E. berbicensis were greater during the rainy season. For all the species studied, the peak parasite prevalence was in the month of highest rainfall levels and there were two peaks of parasite abundance: one in the month with highest rainfall level and the other in the month of transition from the rainy season to the dry season. In these hosts, around 70% of the E. berbicensis specimens were collected during the rainy season. The body conditions of the hosts also did not suffer any seasonal influence. Despite the differences in seasonal rainfall levels, there was no fluctuation in transparency, turbidity, pH, electric conductivity, temperature and dissolved oxygen levels in the water, due to the stability of these parameters during the seasonal cycle investigated in this artificial Amazon ecosystem. This was the first report on the seasonality of infestation by E. berbicensis associated with fish.

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Section: Introductionmentioning

confidence: 99%

First study on infestation of Excorallana berbicensis (Isopoda: Corallanidae) on six fishes in a reservoir in Brazilian Amazon during dry and rainy seasons

Gentil-Vasconcelos

Tavares‐Dias²

2017

Lat. Am. J. Aquat. Res.

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“…The increase in species richness seen during the dry season in the present study might be related to the physical characteristics of that season, such as greater solar radiation, higher temperatures and less precipitation, all of which favor the growth of algae (Kivrak 2006;Marques et al 2012). In addition, water velocity tends to decrease during the dry season (Nogueira 2000;Zeng et al 2006;Cunha et al 2013). The occurrence of a larger number of taxa during the dry season has also been reported for other Brazilian rivers, such as the Urubuí (Aprile & Mera 2007), Paraibuna and Pomba (Soares et al 2007).…”

Section: Discussionmentioning

confidence: 59%

“…Therefore, the studied stretch of river can be considered mostly turbulent because of its high water velocity, which tends to naturally decrease toward the dam. In the CNHP reservoir, however, the speed is not uniform as in totally lentic environments, because its water retention time is only two to five days, and its characteristics therefore resemble those of a river more than those of a lake (Bárbara et al 2010;Cunha et al 2013).…”

Section: Discussionmentioning

confidence: 99%

Phytoplankton of two rivers in the eastern Amazon: characterization of biodiversity and new occurrences

Cunha

et al. 2013

Acta Bot. Bras.

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During the various hydrological periods in 2011, we studied the phytoplankton along an 87-km stretch of the Araguari and Falsino rivers, which are located in the eastern Brazilian Amazon, in the state of Amapá, Brazil, the most ecologically preserved state in the country. In the study area, the aquatic ecosystem is under pressure from human activities such as, mining, hydroelectric power generation and urbanization, which contrast with the surrounding areas that are designated for biodiversity conservation. The aim of this study was to characterize the composition, frequency and richness of algae species and also to identify spatial-temporal patterns of taxa distribution. During the study period, we identified 185 taxa (136 species in 49 genera). The division Chlorophyta (class: Zygnematophyceae) presented the greatest number of taxa, whereas the division Rhodophyta accounted for only 1% of the taxa recorded. Most of the species identified (69%) were classified as sporadic in occurrence. The few taxa that were classified as common belonged mainly to the group Bacillariophyta. Species richness was greatest richness in the lentic stretches (in a reservoir) and in November (during the dry season). Of the 185 taxa identified, 174 are new records for the state of Amapá.

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“…Segundo PBMC (2012) já estão disponíveis estudos sobre os possíveis efeitos de alterações climáticas nos recursos hídricos do Brasil. Dentre as bacias hidrográficas mais importantes do país, segundo seus atributos hidrológicos e ecológicos, encontra-se a do Amazonas, que drena regiões que podem sofrer diferentes impactos relacionados às alterações de temperatura e precipitação (volume e frequência de chuvas), com efeitos distintos na disponibilidade de água para uso humano (Tucci, 1998;Oliveira et al, 2010) e manutenção de processos ecológicos (Neves et al, 2011;Cunha et al, 2013;Ward et al, 2013).…”

Section: Introductionunclassified

Evento extremo de chuva-vazão na bacia hidrográfica do rio Araguari, Amapá, Brasil

Cunha

Vilhena

Santos

et al. 2014

Rev. bras. meteorol.

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O objetivo da investigação foi analisar vazões extremas ocorridas entre 9 e 14 de abril de 2011 na bacia do Rio Araguari-AP. A metodologia consistiu de três etapas principais: 1) re-análise da precipitação estimada pelo Modelo BRAMS (Brazilian in Development Regional Atmospheric Model System),utilizando como suporte a sinótica do mesmo período; 2) análise de vazão nas seções de monitoramento hidrológico em Porto Platon, Capivara e Serra do Navio (ADCP-Accustic Doppler Profiller Current); 3) análise estatística da série histórica de vazões máximas em Porto Platon utilizando distribuição de Gumbel. Observou-se que o modelo BRAMS capturou parcialmente o padrão do sistema de precipitação quando comparado com a análise sinótica e com os dados da literatura, mas demandando ainda otimização na representação de respostas hidrológicas extremas. Em Porto Platon foi registrada uma vazão recorde de 4036 m3/s, cujo comportamento foi analisado sob a ótica dos mecanismos disponíveis de monitoramento no Estado. Concluiu-se que tais eventos extremos são pouco detectáveis e oferecem riscos consideráveis aos usuários da bacia. A previsão de vazão, baseada na série hidrológica disponível, era de 100 anos de retorno, mas as análises revelaram que este período seria de 360 anos, indicando significativa fragilidade do sistema de previsão de eventos extremos no Estado.

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Modelagem e Simulaçao do Escoamento e Dispersão Sazonais de Agentes Passivos no Rio Araguari AP: Cenários para o AHE Ferreira Gomes-I-Amapá/Brasil

Cited by 16 publications

References 5 publications

First study on infestation of Excorallana berbicensis (Isopoda: Corallanidae) on six fishes in a reservoir in Brazilian Amazon during dry and rainy seasons

First study on infestation of Excorallana berbicensis (Isopoda: Corallanidae) on six fishes in a reservoir in Brazilian Amazon during dry and rainy seasons

Phytoplankton of two rivers in the eastern Amazon: characterization of biodiversity and new occurrences

Evento extremo de chuva-vazão na bacia hidrográfica do rio Araguari, Amapá, Brasil

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