The giant African land snail, Lissachatina fulica is considered to be one of the world's worst invader species. This snail can provoke major economic and public health problems in urban areas, in particular as a potential vector of nematodes that infect both humans and animals. In this context, the present study investigated the extent of the infestation of this exotic snail in the urban neighborhoods of the city of Rio Branco, verified the presence of endoparasites in these snails, and evaluated the knowledge of local residents with regard to the presence of this invader species. For this, daytime surveys were conducted between August 2015 and June 2016. For the analysis of endoparasites, 44 live specimens were sent to the National Reference Laboratory for Schistosomiasis-Malacology (LRNEM) of the Oswaldo Cruz Institute (FIOCRUZ). The knowledge of local residents in the infested neighborhoods was investigated using questionnaires with direct, closed questions. The exotic invader species (L. fulica) was detected in 24 of the 36 neighborhoods visited. A total of 858 L. fulica specimens were collected, of which, 329 were alive and 527 were dead. The total length of the shell ranged from 0.7 to 14.2 cm, with a mean±standard deviation of 4.8±2.21 cm. The density of snails in the areas surveyed varied from 0.34 individuals/m2 to 3.54 individuals/m2, while the mean density within the whole study area was estimated to be 0.54 individuals/m2. Mature eggs were found in only 9 (2.7%) of the 329 specimens dissected. The endoparasitological analysis revealed the presence of rhabditiform larvae in 84% of the specimens examined, as well as the nematodes Aelurostrongylus abstrusus (22.7% of the specimens) and Strongyluris sp. (2.2%). A total of 39 local residents were interviewed, and while all were conscious of the presence of the mollusk, none knew its origin or the most adequate way of dealing with it. The results of the study indicate an ample infestation of the city of Rio Branco by L. fulica, and confirmed a complete lack of intervention on the part of the local authorities for the implementation of measures foe the control and management of this pest within the urban zone of Rio Branco.
The molluscan fauna of southwestern Brazilian Amazonia is poorly known due to the lack of focused collection areas in the region since the early 20th century. The present study provides an inventory of the terrestrial gastropods from a forest fragment in the eastern Acre state, Brazil: the Humaitá Forest Reserve (“Reserva Florestal Humaitá”). Live specimens and empty shells were collected between August 2018 and January 2019. A total of 20 species were identified, distributed in 11 families. Most (13) of these species were recorded in Acre for the first time. Furthermore, we confirm the occurrence of Systrophia helicycloides (d’Orbigny, 1835) in Brazil, reiterate the synonymy of Plekocheilus pentadinus (d’Orbigny, 1835) with P. floccosus (Spix in Wagner, 1827), and synonymize Solaropsis peruviana Haas, 1951 with S. juruana Ihering, 1905.
No abstract
The Cayenne tick, Amblyomma cajennense (Fabricius, 1787) (Ixodida: Ixodidae), parasitizes a range of vertebrate hosts, including humans, accidentally. Infestation by this species has important implications for public health, given that these ticks habitually bite humans and may act as the vectors of several pathogens. Here, we present a detailed case of human parasitism by A. cajennense and provide the first record of the occurrence of the species in the state of Acre, Brazil.
Este estudo de caso de natureza qualitativa objetiva analisar depoimentos de professores de uma escola da rede pública estadual situada na zona sul do município de Porto Alegre (Rio Grande do Sul, Brasil) de modo a melhor compreender dilemas, dúvidas e percepções docentes acerca das relações de permanência e pertencimento por eles instituídas no espaço escolar. “Ser ou não ser professor?” constitui uma indagação recorrente entre os trabalhadores da educação, ressoando dela sentidos de mal-estar associados à sua desvalorização e reificação. Tal constatação tanto justifica quanto alavanca um trabalho de pesquisa que assume, como principal aporte teórico-metodológico, a análise de discurso francesa fundada pelo filósofo Michel Pêcheux e divulgada/consolidada em nosso país por estudiosos e grupos de pesquisa que reiteram um compromisso de interpretação dos dizeres do qual resulta o estabelecimento de uma relação menos ingênua com a linguagem. Uma tal filiação resultou, no caso desta investigação, na evidenciação de efeitos de sentidos de pertencimento articulados à relação positiva que os docentes mantêm com a docência e, ao mesmo tempo, de receio quando associam educação e dificuldades, docência e dificuldades. Isso denota tensão entre duas formações discursivas (FD) que estão em relação de embate uma com a outra assim como as duas posições de sujeito identificadas: o professor sente prazer com o trabalho que realiza, mas não nega que este trabalho não é fácil, dificuldades ocorrem. Nesse dito, está presente um não-dito segundo o qual o professor sente tanto prazer quanto desprazer, portanto, ele desliza de uma posição para outra, confirmando que as posições de sujeito são intercambiáveis e que ocorre dispersão do sujeito no texto.
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