The introduction of species has become an important problem for biodiversity and natural ecosystem conservation. The lake system of the middle Rio Doce (MG, Brazil) comprises c. 200 lakes at various conservation states, of which 50 are located within the Rio Doce State Park (PERD). Previous studies had verified several of these lakes suffered non-native fishes introductions and the presence of these species needs for the implementation of actions aiming at not only their control but also the preservation of the native species. This study discusses the effects of non-native fish species in the largest conservation unit of Atlantic Forest in Minas Gerais, southeast of Brazil, using data from 1983 to 2010 distributed as follow: data prior to 2006 were obtained from previous studies, and data from September 2006 to July 2010 were obtained in Lake Carioca at four sampling stations using gillnets, seine nets and sieve. A total of 17 fish species was collected (2006)(2007)(2008)(2009)(2010) of which five were introduced species. Among the small to medium size native species (30 to 2000 mm standard length) seven had disappeared, two are new records and one was recaptured. The non-native species Cichla kelberi (peacock bass) and Pygocentrus nattereri (red piranha) are within the most abundant captured species. Integrated with other actions, such as those preventing new introductions, a selective fishing schedule is proposed as an alternative approach to improve the conservation management actions and the local and regional biodiversity maintenance.Keywords: fish fauna, biological invasion, Rio Doce basin, conservation management, local extinction. Palavras-chave: ictiofauna, invasão biológica, bacia do Rio Doce, manejo conservacionista, extinção local. Perda de biodiversidade em uma unidade de conservação da Mata Atlântica brasileira: efeitos da introdução de espécies não nativas de peixes
The process of soil erosion begins with the removal of native vegetation, which exposes the soil surface to the impact of raindrops, whose kinetic energy causes the destruction of its structure, releasing the different constituents of the texture to be carried by the wind and by the floods. In this sense, the disorderly growth of cities brings serious problems for the urban space, mainly related to subdivisions and waterproofing, which can trigger and / or intensify erosion processes. Thus, this research aimed to characterize, from a geological perspective, three ravines located in the neighborhoods of Colina da Praia (Rav 1), Ribeira de Baixo (Rav 2) and Praia (Rav 3), in the city of Itabira (MG), identifying the factors that favor its development. The analysis of the satellite images allowed to indicate the anthropic interference in these areas, evidenced by the removal of vegetation, opening of lots and streets. As for the geological characterization, it is possible to emphasize the presence of schist rock and granitic-gneiss rock, as well as similar orientations between the direction of ravines 1 and 3 with the fracture planes obtained. Considering the granulometric analysis of soil samples of the three ravines analyzed, it is verified the predominance of soil with medium texture, which commonly has a medium erodibility index. However, the anthropic interference characterized by the removal of the vegetation cover and the opening of road, together with the geological structuring, are factors that contribute, inseparably, to the development of the erosive processes analyzed. The importance of pedological surveys for proper land use planning is emphasized, which will minimize the negative impacts of natural environments.
In neighborhoods and rural communities, precarious sanitation conditions are observed that unleash numerous negative consequences for the inhabitants residing in these localities, and the sanitary conditions are essential for the well-being, quality of life and health of population. The lack of environmental awareness of the residents in relation to the problems that surrounds them is also a concern. Thus, the aim of this study was to verify the basic sanitation services and the environmental awareness of the residents in Candidópolis community, located in rural area ofItabira / MG. For this, questionnaires were applied to 50 community residents. The results indicate that the artesian well in the community is the most widely used alternative for water supply. As for sanitation, it was noted that more than half of the sewage is dumped into waterways without any previous treatment. With respect to the solid wastes, these are collected only once a week and there is no selective waste collection in the community. It was verified few water drainage systems, but some of them are clogged or silted. In the aspect related to environmental awareness, a part of the residents is aware of the situation experienced is not the most appropriate and they believe that the implement of new technologies would bring benefits to the community in environmental, health and quality of life. In order to solve the problems related to sanitation, the involvement of municipal institutions is essential, through the use of adequate technologies for collection and treatment of sewage and waste, considering the characteristics of the region. It is also proposed to carry out environmental education projects to the community residents in order to minimize negative environmental interventions.
This article seeks to propose the notion of revolt as a category of analysis to examine the feminist movement that occurred in May 2018 in Chile. In this sense, from this notion, it will be asked how the colonial efficiency, inscribed in the hetero/racial and oppressive memory of Latin America, can be interrupted by a “feminist operation” evidencing the intersections between power, language, violence and domination. All this to try to show that this has implied the norms in the institutions and that they have been applied at the level of the discourse, the representations and their practices in differents political/cultural and institutional spheres in Chile. To this end, the voices of Chilean women activists of the revolt will be taken to address the issue: how the revolt, as a feminist action to disrupt the patriarchal order, can lift up a practice of emancipation?
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