Navegando por Autor "Viana Junior, Arleu Barbosa"
Agora exibindo 1 - 6 de 6
Resultados por página
Opções de Ordenação
Item Do vegetal communities dominated by invasive exotic plant species affect the structure of bird communities in an Atlantic Forest area?(2020) Silva, Cleverton da; Viana Junior, Arleu Barbosa; Azevedo, Cristiano Schetini de; Fabricante, Juliano RicardoInvasive exotic plants can modify the structure of the environment, producing a cascade of effects on different animal populations, such as birds, which tend to decrease in quantity and diversity of species. The objective of this study was to evaluate how the bird assemblage responds to an invasion by exotic species of plants in an Atlantic Forest area in northeastern Brazil. Data were collected on the richness, abundance, frequency of occurrence, trophic groups, dependence on forest habitats, and conservation status of bird species in two forest areas: one with no invasive plant species and one with a predominance of invasive plant species, mainly trees. The results showed that the presence of invasive exotic vegetation influenced the bird assemblage, and in the area where the invasive exotic species were predominant, the richness and abundance of birds were significantly lower than in the area with natural vegetation. In addition, the composition of the bird assemblage was significantly different in areas where exotic plant species prevailed, with no species dependent on forest habitats or threatened with extinction. We concluded that the habitat dominated by invasive exotic plants modified the local bird assemblage. Thus, the control and management of alien plant species must be undertaken.Item Evaluation of the toxicity of the pesticide acephate and his by-product methamidophos over the behaviour of zebrafish Danio rerio (Cypriniformes, Cyprinidae).(2023) Ramos, Bruno Carlos; Sant'Anna, Eneida Maria Eskinazi; Azevedo, Cristiano Schetini de; Viana Junior, Arleu Barbosa; Sant'Anna, Eneida Maria Eskinazi; Magalhães, André Lincoln Barroso; Castro, Andrey Leonardo FagundesWorldwide, Brazil leads in the use of pesticides, and acephate is the fifth most used pesticide in the country. This component and its by-product methamidophos, may cause deleterious effects on the physiology and behaviour of various animals when in contact with water. Studies investigating the negative impacts of acephate in animals have used zebrafish larvae as a model species, but the effect on adult individuals remains unclear. Our main objective was to assess the behavioural changes in adult zebrafish (Danio rerio) exposed to acephate and methamidophos. To this end, 160 individuals of zebrafish were divided in three groups: acephate, methamidophos (exposed) and control groups (non-exposed), where subjects on the treatment groups were exposed to 7 μg/L of acephate and 7 μg/L methamidophos for 28 days. To compare the groups, behavioural assessments were carried out using scan sampling with instantaneous recordings of behaviour every 30 seconds, for ten minutes each day. Fish behaviour and fish location in the water column were compared between treatment and controls using Generalized linear Mixed Models (GLMMs). The results showed alteration in swimming patterns, an increase in aggression, an increase in abnormal behaviours and other stress-related behaviours, such as gasping for air, provoked by acephate and methamidophos. Similarly, fish in the treatment group preferred to swim near the surface of the water. These behavioural alterations caused by acephate and methamidophos may have serious consequences to wild fish communities, such as an increased risk of predation and may contribute to the extinction of local populations. These findings highlight the usefulness of behaviour as a tool to assess environmental impact caused by pesticides.Item A global review of animal translocation programs.(2020) Resende, Paloma Silva; Viana Junior, Arleu Barbosa; Young, Robert John; Azevedo, Cristiano Schetini deA global review of animal translocation programs. We performed a bibliometric analysis to investigate the efficiency of release techniques (soft and hard–release), to analyse the characteristics and outcomes of the translocation programs, to identify knowledge gaps, and to provide recommendations. Animal conservation studies involving animal release to the wild increased significantly over the 31 years studied and were more frequently performed with terrestrial mammals than with other taxonomic groups. Most of the studies were performed by researchers from developed countries. Translocations occurred mostly in temperate regions, with almost no translocations occurring in the tropics. Almost 60% of the studies did not provide information regarding the success or failure of the translocation programs. The most commonly used technique was hard release. Wild–caught specimens were preferred for translocations. Translocation programs were less common for groups like amphibians, fishes, and invertebrates. If criteria for suitable translocation are met, this management tool should also be conducted for tropical threatened species, led by native researchers. Furthermore, criteria for successful translocation should be clearly identified in order to improve future conservation actions.Item Indoor and outdoor management for cats : inferences about the welfare and cat-caretaker relationship.(2023) Oliveira, Igor de Abreu; Viana Junior, Arleu Barbosa; Azevedo, Cristiano Schetini deThe population of owned domestic cats is growing worldwide and research that contributes to a better understanding of the effects of management type (indoor x outdoor) on cats’ health and care practices is necessary. Care practices related to each management type may interfere with the cat-caretaker relationship, ultimately influencing cat welfare. Therefore, the main objective of this study was to identify the influence of management types on cat health and relationship with caretakers. A total of 114 owners from 2 Brazilian municipalities responded to an online questionnaire. Categorical principal component analysis, Fisher’s exact tests and X²-tests were used to investigate factors. Half of the respondents (50.88%) answered that they use indoor management. This type of management was associated with a greater variety and frequency of care practices (such as fur combing, claw cutting and toy offering), facilitating a more positive cat-caretaker relationship. Outdoor management (49.12%) was associated a low frequency and variety of care practices, not allowing such a positive cat-caretaker relationship. We conclude that caretakers who practice indoor management are more likely to have a positive relationship with their cats than those who practice outdoor management.Item Padrões de atividades dos mamíferos do entorno da Floresta Estadual do Uaimií, com ênfase nos catetos Dicotyles tajacu (Linnaeus, 1758) (Cetartiodactyla, Tayassuidae).(2022) Santos, Débora Bohrer dos; Azevedo, Cristiano Schetini de; Viana Junior, Arleu Barbosa; Pires, Maria Rita Silvério; Azevedo, Cristiano Schetini de; Araujo, Ana Carolina Srbek de; Braga, Caryne Aparecida de CarvalhoMamíferos podem alterar o padrão de atividade em resposta a diferentes fatores como forma de garantir a sobrevivência. O conhecimento desses padrões permite compreender as interações interespecíficas da comunidade e pode subsidiar a proposição de medidas de conservação da biodiversidade local. Este estudo teve como objetivo registrar espécies da mastofauna de médio e grande porte na APA das Andorinhas, particularmente no entorno da FLOE Uaimií, no município de Ouro Preto, MG, avaliar o padrão de atividade desses mamíferos em relação à sazonalidade climática, bem como caracterizar a sobreposição de atividade entre os catetos, Dycotiles tajacu, e seus predadores entre o período seco e chuvoso. Para tanto, foram utilizadas oito armadilhas fotográficas durante treze meses. Foram registradas 17 espécies, dentre elas Mazama gouazoubira, Sylvilagus brasiliensis e Puma concolor, que se encontram ameaçadas. As espécies que tiveram maior número registros foram: Eira barbara (172 registros), Sylvilagus brasiliensis(161), Cuniculus paca (137), D. tajacu (132) e Cerdocyon thous (71). Leopardus pardalis e P. concolor juntos somaram 56 registros indepentes. Foram observadas variações no padrão de atividade da maioria das espécies entre as estações climáticas, sendo maior no período mais frio e seco. O cateto D. tajacu não apresentou alteração significativa na ativadade em função da sazonalidade climática. Sua atividade teve baixa sobreposição com P. concolor e alta sobreposição com a atividade de Canis lupus familiaris e Homo sapiens. Esses resultados podem estar relacionados com a baixa pressão de caça exercida na região e também ao comportamento agressivo dos catetos, bem como à alteração do período de forrageio destes como forma de escapar de seus predadores. Além de entender as interações interespecíficas entre os catetos e seus principais predadores, os resultados também contribuíram com o inventário de espécies da região mostrando que as Unidades de Conservação estudadas abrigam diversas espécies de mamíferos, ressaltando a importância dessas UCs para a conservação das espécies.Item The infuence of population‑control methods and seasonality on the activity pattern of wild boars (Sus scrofa) in high‑altitude forests.(2020) Morais, Tatiania de Assis; Rosa, Clarissa Alves da; Viana Junior, Arleu Barbosa; Santos, Antônio Pedro; Passamani, Marcelo; Azevedo, Cristiano Schetini deThe wild boar (Sus scrofa) is a problematic invasive species which has colonized the threatened Brazilian Atlantic Forest. Our objective was to evaluate if population control and seasonality afect the circadian rhythm of wild boar activity. Wild boar activity was monitored by camera-traps for 1 year without population-control methods and 1 year with populationcontrol methods implemented in the area. Before population control was implemented, wild boar activity was uniform across 24 h, with animals being active at any given time (cathemeral). After the population control, wild boars concentrated their activities on the daylight period. Also, wild boars were more active during the wet season, possibly infuenced by the presence of seeds of Araucaria angustifolia trees. Based on these results, control measures should be conducted during the wet season and diferent management strategies, such as the use of rifes with telescopic sights and silencers, should be tested.