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Climate Extremes along the Mining Chain over the eastern amazon: Projections to 2050

Atmospheric and Climate Sciences 2021年第1期11卷 125-147页

作者： Claudia Priscila Wanzeler da Costa Douglas da Silva Ferreira Nikolas Jorge Carneiro Instituto Tecnológico Vale Belem Brazil

The mineral industry is of great importance for the economy and for the development of Brazil. However, climate change further accentuates the impacts caused by extreme weather and climate events on the logistics and operation processes of the mineral production chain (from the mine to the port). In order to reduce these effects, it is essential to have information about the future climate that will help this economic sector to carry out better long-term planning of its activities. However, the current scientific literature still lacks studies with this approach applied to the mineral industry. Therefore, the purpose of this study was to evaluate the future seasonal patterns of climate extremes in eastern amazonia, exploring their impacts on the mineral production chain in the near future (2019-2050). To categorize the dry and rainy climate extremes, the Standard Precipitation Index (SPI) was calculated for the precipitation data series of Climate Prediction Center (CPC) observations and the PRECIS regional modeling system, considering the IPCC RCP4.5. The 1981-2005 period was defined as the present climate and used to assess the performance of the modeling system in reproducing the extremes. The analyses were based on the relative frequency of the categories of dry and rainy extremes. The performance evaluation of PRECIS showed that it had better accuracy in representing seasonal extremes of drought than extremes of rain. Along the mineral chain in eastern amazonia, its accuracy was better over the port region, except for the dry extremes experienced from June to August (JJA), and from December to February (DJF) and March to May (MAM) for rainy extremes. The analysis of the frequency of occurrence of these events for the future indicates a greater probability of rain extremes along the mineral chain compared to another category of extremes. In addition, JJA will be the most suitable period to optimize operational processes in eastern amazonia, as extremes are less

关键词： PRECIS Climate Extremes eastern amazon Mining SPI

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First Record in Brazil of Epistylis sp. (Ciliophora) Adhered to Argulus sp. (Argulidae), a Parasite of Hoplias aimara (Eritrhinidae)

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Natural Resources 2016年第6期7卷 331-336页

作者： Lincoln Lima Corrêa Marcos Sidney Brito Oliveira Luiza Prestes Marcos Tavares-Dias Universidade Federal do Oeste do Pará (UFOPA) Instituto de Ciências e Tecnologia das águas (ICTA) Santarém Brasil Programa de Pós-Graduaç ã o em Recursos Aquáticos Continentais Amazô nicos (PPGRACAM) Universidade Federal do Oeste do Pará (UFOPA) Instituto de Ciências e Tecnologia das águas (ICTA) Santarém Brasil Programa de Pós-Graduaç ã o em Ecologia Aquática e Pesca (PPGEAP) Universidade Federal do Pará (UFPA) Belém Brasil Embrapa Amapá Rodovia Juscelino Kubitschek Macapá Brasil

This paper records the first occurrence of Epistylis sp. on the body surface of Argulus sp. parasitizing Hoplias aimara from the upper Araguari River, in the eastern amazon region, in the north of Brazil. Of the 16 specimens of H. aimara examined, 93.7% had their pelvic, caudal and pectoral fins and tegument infested by Argulus sp. (n = 73), which in turn were infested by Epistylis sp. The specimens of Epistylis sp. from the body surface of Argulus sp. were analyzed using Scanning Electron Microscopy (SEM). The present study also identified a widening of the geographic distribution of these two species of ectoparasites to the eastern amazon region of Brazil.

关键词： Parasite Ecology Opportunistic Parasite Rio Araguari eastern amazon

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