Morphometric analysis of the hydrographic sub-basin of the Piauitinga River, SE

As bacias hidrográficas apresentam um papel de fundamental importância para a manutenção da vida dos seres vivos, devendo assim, serem estudadas e preservadas. O estudo objetivou realizar um estudo morfométrico da bacia hidrográfica do rio Piauitinga, afluente de maior vazão do rio Piauí e de grande importância pelo fornecimento de água do município de Estância-SE. Preconizando este objetivo, foi utilizado Sistema de Informações Geográficas, tendo como base de dados arquivos disponibilizados pela Secretaria de Recursos Hídricos de Sergipe, a qual possui como dados topográficos curvas de nível com equidistâncias de 10m. Suas características geométricas foram descritas através da sua área, perímetro, comprimento axial, coeficiente de compacidade, fator de forma, índice de circularidade e razão de elongação. A sub-bacia tende a apresentar um tempo de concentração de médio para alto e uma forma mais alongada do que circular, o que faz reduzir a probabilidade de enchentes. Por meio da hierarquização dos seus cursos d’água, foi possível compreender que o rio principal da sub-bacia do rio Piauitinga possui ordem quarta. O modelo numérico do terreno mostrou que a bacia apresenta significativa variação de altitude (entre 20 e 190 m), com 40,14% da área apresentando declividade entre 8 e 20%. O coeficiente de compacidade apresenta o valor afastado da unidade e seu fator de forma possui um baixo valor, evidenciado pela baixa densidade de drenagem.The present work aimed to carry out a morphometric study of the hydrographic basin of the Piauitinga River, a tributary with the highest flow of the Piauí River and of great importance for the supply of water in the municipality of Estância-SE. In favor of this objective, a Geographic Information System was used, having as database the files made available by the Sergipe Water Resources Secretariat, which has topographic data as contour lines with 10m equidistances. Its geometric characteristics were described through its area, perimeter, axial length, compactness coefficient, form factor, circularity index and elongation ratio. This sub-basin tends to have a medium to high concentration time and is more elongated than circular, which reduces the likelihood of flooding. Through the hierarchy of its water courses, it was possible to understand that the main river of the Piauitinga River sub-basin has a fourth order. The numerical model of the terrain showed that the basin presents a significant variation in altitude (between 20 and 190 m), with 40.14% of the area presenting a slope between 8 and 20%. The compactness coefficient shows the value away from the unit and its form factor has a low value, evidenced by the low drainage density

Brazilian Flora 2020: Leveraging the power of a collaborative scientific network

International audienceThe shortage of reliable primary taxonomic data limits the description of biological taxa and the understanding of biodiversity patterns and processes, complicating biogeographical, ecological, and evolutionary studies. This deficit creates a significant taxonomic impediment to biodiversity research and conservation planning. The taxonomic impediment and the biodiversity crisis are widely recognized, highlighting the urgent need for reliable taxonomic data. Over the past decade, numerous countries worldwide have devoted considerable effort to Target 1 of the Global Strategy for Plant Conservation (GSPC), which called for the preparation of a working list of all known plant species by 2010 and an online world Flora by 2020. Brazil is a megadiverse country, home to more of the world's known plant species than any other country. Despite that, Flora Brasiliensis, concluded in 1906, was the last comprehensive treatment of the Brazilian flora. The lack of accurate estimates of the number of species of algae, fungi, and plants occurring in Brazil contributes to the prevailing taxonomic impediment and delays progress towards the GSPC targets. Over the past 12 years, a legion of taxonomists motivated to meet Target 1 of the GSPC, worked together to gather and integrate knowledge on the algal, plant, and fungal diversity of Brazil. Overall, a team of about 980 taxonomists joined efforts in a highly collaborative project that used cybertaxonomy to prepare an updated Flora of Brazil, showing the power of scientific collaboration to reach ambitious goals. This paper presents an overview of the Brazilian Flora 2020 and provides taxonomic and spatial updates on the algae, fungi, and plants found in one of the world's most biodiverse countries. We further identify collection gaps and summarize future goals that extend beyond 2020. Our results show that Brazil is home to 46,975 native species of algae, fungi, and plants, of which 19,669 are endemic to the country. The data compiled to date suggests that the Atlantic Rainforest might be the most diverse Brazilian domain for all plant groups except gymnosperms, which are most diverse in the Amazon. However, scientific knowledge of Brazilian diversity is still unequally distributed, with the Atlantic Rainforest and the Cerrado being the most intensively sampled and studied biomes in the country. In times of “scientific reductionism”, with botanical and mycological sciences suffering pervasive depreciation in recent decades, the first online Flora of Brazil 2020 significantly enhanced the quality and quantity of taxonomic data available for algae, fungi, and plants from Brazil. This project also made all the information freely available online, providing a firm foundation for future research and for the management, conservation, and sustainable use of the Brazilian funga and flora