Pervasive gaps in Amazonian ecological research

Biodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear un derstanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5–7 vast areas of the tropics remain understudied.8–11 In the American tropics, Amazonia stands out as the world’s most diverse rainforest and the primary source of Neotropical biodiversity,12 but it remains among the least known forests in America and is often underrepre sented in biodiversity databases.13–15 To worsen this situation, human-induced modifications16,17 may elim inate pieces of the Amazon’s biodiversity puzzle before we can use them to understand how ecological com munities are responding. To increase generalization and applicability of biodiversity knowledge,18,19 it is thus crucial to reduce biases in ecological research, particularly in regions projected to face the most pronounced environmental changes. We integrate ecological community metadata of 7,694 sampling sites for multiple or ganism groups in a machine learning model framework to map the research probability across the Brazilian Amazonia, while identifying the region’s vulnerability to environmental change. 15%–18% of the most ne glected areas in ecological research are expected to experience severe climate or land use changes by 2050. This means that unless we take immediate action, we will not be able to establish their current status, much less monitor how it is changing and what is being lostinfo:eu-repo/semantics/publishedVersio

Pervasive gaps in Amazonian ecological research

Biodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear understanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5,6,7 vast areas of the tropics remain understudied.8,9,10,11 In the American tropics, Amazonia stands out as the world's most diverse rainforest and the primary source of Neotropical biodiversity,12 but it remains among the least known forests in America and is often underrepresented in biodiversity databases.13,14,15 To worsen this situation, human-induced modifications16,17 may eliminate pieces of the Amazon's biodiversity puzzle before we can use them to understand how ecological communities are responding. To increase generalization and applicability of biodiversity knowledge,18,19 it is thus crucial to reduce biases in ecological research, particularly in regions projected to face the most pronounced environmental changes. We integrate ecological community metadata of 7,694 sampling sites for multiple organism groups in a machine learning model framework to map the research probability across the Brazilian Amazonia, while identifying the region's vulnerability to environmental change. 15%–18% of the most neglected areas in ecological research are expected to experience severe climate or land use changes by 2050. This means that unless we take immediate action, we will not be able to establish their current status, much less monitor how it is changing and what is being lost

Pervasive gaps in Amazonian ecological research

Biodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear understanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5,6,7 vast areas of the tropics remain understudied.8,9,10,11 In the American tropics, Amazonia stands out as the world's most diverse rainforest and the primary source of Neotropical biodiversity,12 but it remains among the least known forests in America and is often underrepresented in biodiversity databases.13,14,15 To worsen this situation, human-induced modifications16,17 may eliminate pieces of the Amazon's biodiversity puzzle before we can use them to understand how ecological communities are responding. To increase generalization and applicability of biodiversity knowledge,18,19 it is thus crucial to reduce biases in ecological research, particularly in regions projected to face the most pronounced environmental changes. We integrate ecological community metadata of 7,694 sampling sites for multiple organism groups in a machine learning model framework to map the research probability across the Brazilian Amazonia, while identifying the region's vulnerability to environmental change. 15%–18% of the most neglected areas in ecological research are expected to experience severe climate or land use changes by 2050. This means that unless we take immediate action, we will not be able to establish their current status, much less monitor how it is changing and what is being lost

Crise de identidade do sujeito

O artigo visa analisar o tema da construção da identidade do sujeito, apresentando o conceito das velhas e novas identidades e das três concepções de identidade: o sujeito do iluminismo, o sujeito sociológico e o sujeito pós-moderno, observando as profundas modificações as quais o sujeito foi submetido, abandonando sua identidade fixa e sólida por identidades variáveis e temporárias. Apresenta-se um histórico da construção da identidade do sujeito na humanidade, depois, o artigo aborda a questão da nova ideia de identidade que a sociedade líquida globalizada impõe. Finalizando, apresentamos a mudança nos relacionamentos afetivos que a pós-modernidade líquida está proporcionando. Palavras-chave: identidade; modernidade; sociedade; educação; globalização; sujeito

Crise de identidade do sujeito

<p>O artigo visa analisar o tema da construção da identidade do sujeito, apresentando o conceito das velhas e novas identidades e das três concepções de identidade: o sujeito do iluminismo, o sujeito sociológico e o sujeito pós-moderno, observando as profundas modificações as quais o sujeito foi submetido, abandonando sua identidade fixa e sólida por identidades variáveis e temporárias. Apresenta-se um histórico da construção da identidade do sujeito na humanidade, depois, o artigo aborda a questão da nova ideia de identidade que a sociedade líquida globalizada impõe. Finalizando, apresentamos a mudança nos relacionamentos afetivos que a pós-modernidade líquida está proporcionando.</p> <p><strong>Palavras-chave:</strong> identidade; modernidade; sociedade; educação; globalização; sujeito.</p><br /

Heavy metal bioaccumulation of the characiform Brycon falcatus Muller & Troschel, 1844 in the Teles Pires basin, Southern Amazon

The Teles Pires River basin is located in an area of the Southern Amazon where discharge of tannery effluents and intense agricultural activity occurs. These activities increase the risk of contamination by runoff and leaching of pesticides and heavy metals. This study presents the concentration and bioaccumulation of heavy metals copper (Cu) and total chromium (Cr) in matrinxã (Brycon falcatus), a species of fish highly consumed in the region. Liver and muscle tissue was analyzed from 41 samples of B. falcatus collected during the dry season in 2013 from the Teles Pires River basin. Considering that bioaccumulation is the progressive increase in the amount of a substance in an organism or part of an organism, copper bioaccumulation in liver samples from B. falcatus was verified. Cr and Cu concentrations were higher in the liver than in the muscle tissue of fish collected in all rivers. The highest concentrations of Cr in the liver were observed in fish collected from the Teles Pires River (1.87 μg∙g-1) and the Celeste River (1.06 μg∙g-1). The highest concentrations of Cu in the liver were observed in fish collected from the Cristalino River (44.20 μg∙g-1) and the Teles Pires River (34.77 μg∙g-1). The high concentration of Cu in the livers of fish collected from the Teles Pires river basin reflects the economic activities of mining and agriculture in the surrounding areas of this basin.

<b>Effect of dietary supplement (<i>cevas</i>) on the chemical composition of wild fish <i>Brycon falcatus</i> Müller & Troschel, 1844 in the Teles Pires river basin

  In the Teles Pires River watershed, one of the most common techniques currently used by fishermen to catch fish is to provide a food supplement commonly known as “cevas”. The purpose of this study was to compare the chemical composition of fillets from Brycon falcatus that were caught in both the presence and absence of cevas. The fish were sampled monthly and captured in the following conditions: the Tapaiúna River without cevas, the Teles Pires River with one ceva/100 m, the Celeste River with one ceva/500 m, the Verde River with one ceva/1000 m and the Cristalino River (control area). Subsequent to capture, the fish were euthanized and preserved on ice to determine their water, ash, crude protein and fat contents. Fillets of fish from the control area exhibited a lower level of crude protein (17.81%) compared with that of fish from the other rivers, which did not differ amongst one other. The fillets of fish from the river with the greatest density of cevas (1/100 m) exhibited a higher fat content (3.63%) than that of fish from the control area (1.51%). Thus, the cevas changed the chemical composition of B. falcatus fillets.