Doutorado em Biologia Animal

URI Permanente para esta coleção

http://repositorio.ufes.br/handle/10/17508

Nível: Doutorado
Ano de início: 2009
Conceito atual na CAPES: 4
Ato normativo: Homologado pelo CNE (Portaria MEC Nº 609, de 14/03/2019). Publicação no DOU 18 de março de 2019, seç. 1 - Parecer CNE/CES nº 487/2018, Processo no 23001.000335/2018-51).
Periodicidade de seleção: Anual
Url do curso: https://cienciasbiologicas.ufes.br/pt-br/pos-graduacao/PPGBAN/detalhes-do-curso?id=56

Navegar

Navegando Doutorado em Biologia Animal por Autor "Andrades, Ryan Carlos de"

Agora exibindo 1 - 2 de 2
  • Nenhuma Miniatura disponível
    Item
    Efeitos ecológicos da contaminação com rejeitos de minério no estuário do Rio Doce: uma abordagem utilizando múltiplas linhas de evidência
    (Universidade Federal do Espírito Santo, 2021-09-16) Gabriel, Fabrício Ângelo; Bernardino, Angelo Fraga; https://orcid.org/0000000218384597; http://lattes.cnpq.br/7955326454008127; https://orcid.org/0000-0002-6367-6740; http://lattes.cnpq.br/4141277873952734; Netto, Sergio Antonio; https://orcid.org/0000-0003-2486-640X; http://lattes.cnpq.br/2448717095256037; Andrades, Ryan Carlos de; https://orcid.org/0000-0003-2418-1072; http://lattes.cnpq.br/6620206675151003; Santos, Matilde Maria Moreira dos; https://orcid.org/0000-0001-7067-5028; http://lattes.cnpq.br/9649636182414081; Maciel, Pablo Muniz; https://orcid.org/0000-0001-5310-3781; http://lattes.cnpq.br/1622289785240013
    The Rio Doce estuary was strongly impacted by the plume of tailings and sediment from the Fundão dam collapse in Minas Gerais state, Brazil. The tailings spill and its arrival in the estuary caused catastrophic ecological and socio-economic consequences. Short-term impacts revealed an immediate reduction in biodiversity and prolonged biological effects of chronic contamination by metals and metalloids. This thesis presents an assessment of the contamination and its long-term effects (2017 to 2020, two to four years after the disaster) after the plume arrival in the estuarine environment, using multiple lines of evidence to reveal potential ecological impacts and risks to the aquatic biota. The present approach includes physicochemical analyzes of sediments, determination of bioaccumulation of chemical elements in aquatic fauna, biosynthesis of oxidative stress biomarkers in fish, and effects on structure and composition of estuarine benthic assemblages. Therefore, the thesis chapters progressively reveal the contamination and the ecological and biological effects of elements associated with mine tailings in the estuarine ecosystem. The first chapter highlights the high contamination of the estuary by potentially toxic elements and the associated ecological risks, evidencing the fragility of the estuarine ecosystem in face of acute and chronic impacts caused by the mine tailings spill. The second chapter consists of a long-term analysis of the presence of metals in sediments and an integrated assessment of contaminants, revealing their seasonal variability and the persistence of possible adverse biological effects on the estuarine fauna. The third chapter makes use of proteomics and metallomics analysis to investigate the exposure of the ichthyofauna to contaminants, suggesting that many species are chronically impacted and bioaccumulate metals and metalloids. The fourth chapter focuses on the study of impacts on benthic assemblages after the initial impact (acute) of the arrival of mine tailings. For this purpose, pre-impact ecological data were combined with long-term data (4 years post-disaster). Although there is an explicit decline in the metals concentrations in estuarine sediment, there has been a stabilization of levels above the reference value for the estuary, probably reflecting a slow recovery of benthic assemblages and continued loss of biodiversity. Finally, the fifth chapter makes an integrative and conclusive synthesis with the multiple lines of evidence used to contribute to the estuarine environmental management after the mine tailings spill in the Rio Doce, as well as to stimulate future studies. The results reported here suggest lasting effects on the ecological system, in which the estuarine biota will continue under chronic disturbance associated with the presence of tailings and metals.
  • Nenhuma Miniatura disponível
    Item
    Nicho e endemismo em ambientes entremarés recifais: uma abordagem utilizando isótopos estáveis
    (Universidade Federal do Espírito Santo, 2018-03-29) Andrades, Ryan Carlos de; Giarrizzo, Tommaso; Joyeux, Jean-Christophe; Hostim-Silva, Maurício; Bernardino, Angelo Fraga; Pichler, Helen
    Although the concept of ecological niche can vary according, its essence lies in understanding the fit of organisms living under specific abiotic and biotic conditions. This thesis examined the coexistence of marine organisms using stable isotopes from an Eltonian niche view, though many aspects also cover Grinnellian and Hutchinsonian perspectives. The surveys were conducted in six oceanic and coastal intertidal environments of the Brazilian Province: Rocas Atoll, Fernando de Noronha and Trindade Island and Salinópolis (Pará state), Jericoacoara (Ceará state) and Anchieta (Espírito Santo state) representing three oceanic and three coastal sites, respectively. The chapters hereafter reveal the importance and ecological functioning of intertidal habitats from a niche and endemism perspective. The first chapter is an introductory chapter, whereas the second highlights the high fish endemism rates found worldwide in oceanic islands intertidal environments, drawing attention to the fragility of this ecosystem. Chapter three is a fish community structure study, which reveals the dominance of intertidal communities by small-sized and resident species. Also, endemic species were abundant in the islands and key to structuring communities. The fourth chapter evidenced through modeling spatial data and stable isotopes analysis (G13C and G15N) that food chains in islands are longer and more complex than in coastal sites and that cryptobenthic species are the most vulnerable species to intra and interspecific competition pressures. Chapter five focused on the potential impacts of an invasive species on island intertidal reef communities. Invader density data and stable isotopes signatures in coastal sites were used to simulate the impact on the islands. We verified that mostly intertidal species are vulnerable to a hypothetical invasion, however endemic species vulnerability is especially worrisome due to low competition resistance and small life territory. The sixth chapter reports on the unexpected death by desiccation of resident and non-resident intertidal fishes, highlighting the harsh conditions that these species experience. Chapter seven presents a set of length-weight and length-length relationships for Brazilian island fishes, including endemics. Summarizing, the niche performed by intertidal species revealed, for the first time, island communities to have high trophic diversity and rich resources at the base of the food chain and endemic species fragility in face of imminent biological invasions and sea-level rise.