Programa de Pós-graduação em Ecologia e Evolução
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Navegando Programa de Pós-graduação em Ecologia e Evolução por Por Orientador "Bortolini, Jascieli Carla"
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Item Impacto das cinzas de queimadas no ambiente aquático e na comunidade fitoplanctônica(Universidade Federal de Goiás, 2023-07-28) Jesus, Gabriel Sampaio de; Nabout, João Carlos; http://lattes.cnpq.br/3335844675689429; Bortolini, Jascieli Carla; http://lattes.cnpq.br/5475113165248615; Bortolini, Jascieli Carla; Carneiro, Fernanda Melo; Carvalho, Priscilla deAmong the main threats to biodiversity are anthropic fires, a joint event, especially during the dry period. However, studies on the indirect effects of fires on aquatic ecosystems are scarce. In this study, we investigated how water quality and phytoplankton community structure might be affected by ash from fires in the Brazilian Cerrado. We used a microcosm experiment to simulate the aquatic environment with different scenarios of ash concentrations, and we evaluated over time the abiotic conditions, composition, richness, and phytoplankton density. We detected an increase in total phosphorus ammoniacal nitrogen concentrations after ash insertion. Regarding the phytoplankton community, we identified changes in composition as a function of time, and we did not recognize changes in richness and density in response to treatment. Our results indicate that ash from fires in the terrestrial environment can affect water quality and the species composition of aquatic communities. However, we suggest longer-duration experiments to evaluate the phytoplankton community's delayed responses.Item Estrutura da diversidade beta e determinantes de riqueza da metacomunidade fitoplanctônica em reservatórios(Universidade Federal de Goiás, 2020-07-31) Moura, Weder Bernardes de; Bortolini, Jascieli Carla; http://lattes.cnpq.br/5475113165248615; Carvalho, Priscilla de; Rodrigues, Luzia Cleide; Bortolini, Jascieli CarlaInformation about species richness, integrating sampled data in local extensions and the dynamics of regional diversity, are essential for understanding the mechanisms that maintain diversity in biological communities, especially in aquatic environments, which have extensive connectivity. We use a phytoplankton community’s database applying the concept of beta diversity partitioned into two mechanisms, turnover and nestedness, and metacommunity, associated with data from environmental and spatial variables sampled at different periods in two subtropical cascading reservoirs, in Iguaçu River basin, Paraná, Brazil. We tested whether there is a predominance of turnover or nestedness in the beta diversity structure, and whether environmental heterogeneity, spatial and / or temporal variation better predict the taxonomic richness of this community. Our results indicated a temporal and spatial variation of the environmental conditions in the reservoirs. Species turnover was predominant in beta diversity structuring, while environmental heterogeneity and temporal variation had a major influence on phytoplankton. Thus, studies that consider the perspective of species selection and environmental variability are of interest, and should be considered both for the conservation of aquatic biodiversity and for the maintenance of ecosystem services.