4 research outputs found
A expansĂŁo urbana da cidade do Salvador e os seus mananciais: estabelecendo paralelos
O sĂtio escolhido para implantação da cidade de Salvador se caracteriza por ser um reservatĂłrio natural de águas, sempre renovadas pelo clima Ăşmido e pelo elevado Ăndice pluviomĂ©trico. A população de Salvador que no inicio do sĂ©culo XX nĂŁo chegava a 300 mil habitantes, no final ultrapassava dois milhões. Por outro lado, ao tempo em que a área urbana se amplia, a cidade segue em busca de atender Ă s demandas de água da sua população, porĂ©m deixando para trás problemas ambientais de grande monta. Utilizando-se de fontes secundarias, este estudo descreve, a partir de recortes temporais, como ocorreu o abastecimento d’água nesta cidade. Sua expansĂŁo fĂsica e populacional deu-se associada ao desenvolvimento econĂ´mico, entretanto, as polĂticas de abastecimento hĂdrico nĂŁo corresponderam Ă s necessidades da sua população ao longo dos sĂ©culos, impactando assim de forma negativa na sua qualidade ambiental, confirmando um processo de urbanização perverso, marcado pela exclusĂŁo social.The site chosen for the implantation of the city of Salvador characterizes for being a natural water reservoir, always renewed by the humid climate and the elevated pluviometer index. Salvador’s population that, in the beginning of 20th century didn’t reach 300 thousand habitants, in the end would pass 2 millions. On the other hand, while the urban area grows, the city seeks to supply the water demands of its population, although leaving behind large scale environmental problems. Utilizing second sources this study describes, from time periods, how the water supply occurred in this city. The physical and population expansion were given to economic development, however the water supply politics didn’t correspond the needs of its population out the centuries impacting in a negative way on its environment quality, and witch means we satiate a perverse process of urbanization, marked by social exclusion
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