Abstract:Este trabalho discute as diferenciações existentes ao longo da plataforma continental brasileira, bem como sua gênese e evolução. Foi realizada uma pesquisa bibliográfica afim de evidenciar as particularidades da mesma, especialmente do setor pernambucano, reconhecido como último elo de ligação entre os continentes americano e africano. A morfologia e as características sedimentológicas da área em estudo são altamente influenciadas por diferentes condições climáticas, hidrológicas e aporte sedimentar continent… Show more
“…In this area, there is an extensive region of rhodolith reefs (about 56,000 km) whose dimensions have recently been estimated [ 44 , 45 ] and which harbour several endemic species [ 45 ]. The area is part of the Northern Brazil Large Marine Ecosystem (NBLME) and is highly influenced by the flow of the Amazon and Tocantins rivers, creating a highly dynamic and productive environment [ 46 – 50 ].…”
Red snapper fishing (Lutjanus purpureus) is an important fishing activity for the Brazilian economy due to its export. The scarcity of up-to-date information on this system’s ecology, economy, and social characteristics contributes to inefficient management. We analyze whether the commercial snapper fishery on the Amazon continental shelf is socioecologically sustainable. For this, an assessment tool was used that can be applied to fishing systems with little data, the Fisheries Performance Indicators (FPI). The results showed that the critical points of this activity are mainly related to the Ecological indicator (2.3) and the Economic indicator (2.8). The best indicator was the Community (3.8). The problems that put at risk the permanence of the activity and its maintenance are: (i) fishing for juveniles; (ii) illegal vessels; (iii) lack of collaboration of the fishing sector with science, and (iv) unreliability of data supplied. All the points mentioned make the snapper fishery on the north coast of Brazil socio-ecologically unsustainable in the long term.
“…In this area, there is an extensive region of rhodolith reefs (about 56,000 km) whose dimensions have recently been estimated [ 44 , 45 ] and which harbour several endemic species [ 45 ]. The area is part of the Northern Brazil Large Marine Ecosystem (NBLME) and is highly influenced by the flow of the Amazon and Tocantins rivers, creating a highly dynamic and productive environment [ 46 – 50 ].…”
Red snapper fishing (Lutjanus purpureus) is an important fishing activity for the Brazilian economy due to its export. The scarcity of up-to-date information on this system’s ecology, economy, and social characteristics contributes to inefficient management. We analyze whether the commercial snapper fishery on the Amazon continental shelf is socioecologically sustainable. For this, an assessment tool was used that can be applied to fishing systems with little data, the Fisheries Performance Indicators (FPI). The results showed that the critical points of this activity are mainly related to the Ecological indicator (2.3) and the Economic indicator (2.8). The best indicator was the Community (3.8). The problems that put at risk the permanence of the activity and its maintenance are: (i) fishing for juveniles; (ii) illegal vessels; (iii) lack of collaboration of the fishing sector with science, and (iv) unreliability of data supplied. All the points mentioned make the snapper fishery on the north coast of Brazil socio-ecologically unsustainable in the long term.
“…Tais estruturas são definidas como um material rochoso alongado e estreito, formado por areias de praia cimentadas por carbonatos. Nestas áreas ocorre o abrasamento, acumulando montantes de algas arribadas diariamente (GOES;FERREIRA, 2017).…”
As macroalgas são seres importantes em seus habitats, pois possuem grande relevância ecológica, uma vez que, nos ecossistemas aquáticos, são fonte de nutrientes e os principais organismos fotossintetizantes. A Praia do Pacheco em Caucaia, município da região metropolitana de Fortaleza-CE, compõe a planície litorânea do nordeste brasileiro. Nesta região, é comum que as macroalgas que se desprenderam de seu substrato se acumulem durante a maré baixa, denominadas de algas arribadas. Esse trabalho objetivou identificar a comunidade de algas arribadas da Praia do Pacheco, avaliando seu potencial nutricional para a formulação de fertilizante para plantas. Nessa perspectiva, foram realizadas duas coletas manuais durante a maré baixa. Uma em abril de 2017 e a outra em outubro de 2018. As amostras foram identificadas e, posteriormente, três das espécies de maior incidência foram analisadas em termos de macro e micronutrientes. Foram encontrados dezoito táxons, sendo: quatorze algas vermelhas, duas algas verdes e duas algas pardas. As espécies encontradas em maior quantidade foram a Hypnea pseudomusciformis, Gracilaria cearensis e Ulva fasciata. Quando analisadas, observou-se que possuem altos níveis de nutrientes com potencial para fins agrícolas. A região estudada apresentou-se como um ambiente rico em macroalgas e em biomassa que devem ser utilizada de forma consciente para garantir sua sustentabilidade.
“…In this area, the continental shelf is 34 km wide to a maximum depth of 60 m (Camargo et al, 2015). The characteristics of the Pernambuco continental shelf are a reflection of the low continental sedimentary contribution, of the predominant tropical climate (Goes and Ferreira, 2017) and tectonism (Vital et al, 2005). Its shallow depth is related to the inefficiency of the marine processes in recent geological periods (Manso et al, 2004).…”
Geomorphological research offers a valuable first step to understand the complexity of seafloor patterns that are likely to support particular fauna, thereby providing value for future targeted studies on benthic communities and habitats. The objective of this study is to perform a geomorphological classification of a tropical continental shelf, located in the north of the State of Pernambuco, Brazil, using Benthic Terrain Modeler (BTM), as a first step to characterize benthic habitats. The classification of the seabed is based on the bathymetry, broad-scale and fine-scale BPI (Benthic Positioning Index), seafloor slope, and a decision table containing definitions and thresholds appropriate to the data input. The relationships between morphology and the deposition of surface sediments were also investigated. Results from the BTM analysis revealed eight types of benthic structures: Flat Plains, Depressions, Gentle Slopes, Steep Slopes, Flat Ridge Tops, Rock Outcrop Highs, Local Pinnacles in Depressions and Local Pinnacles on Broad Flats. The results from this study may therefore assist in selecting priority areas to investigate, supporting better marine spatial planning in the region, and, in the future, collaborating to determine biodiversity patterns in Brazilian waters.
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