Navegando por Autor "Dias, Ricardo A."

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Artigo
Manegement of cats and rodents on inhabited islands: an overview and case study Fernando de Noronha, Brazil.
(Perspectives in ecology and conservation, 2018) Russell, James; Abrahão, Carlos R.c,d,; Silva, Jean C.R.e,; Dias, Ricardo A.
In this paper, an overview of introduced cat and rodent impacts on islands, and methods for their control anderadication, arepresented. FernandodeNoronha, aninhabitedoceanic islandofBrazil,isusedas a case study to illustrate the challenges of cat and rodent management on inhabited islands. Cat impacts have been recorded for 175 vertebrate species, and rat impacts for 173 plant and animal species. Eradication of cats and rodents for species conservation has been successful on small to medium- sized uninhabited or sparsely inhabited islands. However, examples of successful cat and rodent management programmes for biodiversity on inhabited islands are limited. On inhabited islands localised control of cats and rodents occurs, but historically with a focus on agriculture, human livelihoods and animal welfare, and only more recently on native species conservation. Control of cats and rodents on inhabited islands for species conservation lags behind uninhabited islands and the reasons for this are social and complex. Conser vation managers often perceive a lack of support from island residents or administrators, which may or may not actually be the case. Where support does not exist, it may relate to the provisioning of control versus eradication, the techniques proposed, or wider socioeconomic issues. This ultimately translates to conservation inaction, and the ongoing decline and extinction of island fauna. Abundance estimates for cats and density estimates for rats on Fernando de Noronha are presented, along with documented biodiversity impacts, to support recommendations for future management on Fernando de Noronha. © 2018 Associação Brasileira de Ciencia ˆ Ecologica ´ e Conservação. ˜ Published by Elsevier Editora Ltda. This is an open access article under the CC BY-NC-ND license
Artigo
Salmonella enterica in Invasive Lizard from Fernando de Noronha Archipelago:
(Microorganisms, 2017) Abrahão, Carlos R.; Moreno, Luisa Z.; Silva, Jean C. R.; Benites, Nilson R.; Matajira, Carlos E. C.; Ferreira, Fernando; Moreno, Andrea M.; Dias, Ricardo A.
Salmonella infection can pose serious health issues, especially to children, elders or immunosuppressed humans. Wild populations of reptiles can reach Salmonella prevalence of up to 100% and the direct or indirect transmission from reptiles to humans have been extensively reported. Fernando de Noronha (FN) is an inhabited oceanic archipelago in the northeast coast of Brazil, with an economy based on tourism. The tegu (Salvator merianae) is the largest lizard native to South America and was introduced to the archipelago in the early 20th century. This study determines the prevalence, serotypes, antimicrobial resistance, and molecular epidemiology of Salmonella enterica in the tegu population from FN archipelago. Results show that S. enterica is widely distributed in the FN tegu population, with 43.8% prevalence. The bacteria were isolated from 70.5% of the sampled sites and a total of 15 serotypes were detected in 98 S. enterica isolates. Strains were further classified into 31 genotypes. Recaptured animals presented distinct genotypes in each season, demonstrating a seasonal strain turnover. Most S. enterica isolates from FN tegus presented low antimicrobial resistance. This is possibly due to geographical isolation of the island population, hampering contact with strains from livestock from the continent, where antimicrobial resistance is common.