Programa de Pós-graduação em Ecologia e Evolução
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Navegando Programa de Pós-graduação em Ecologia e Evolução por Por Orientador "ANGELINI, Ronaldo"
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Item Análise da comunidade de peixes e da teia trófica de um trecho do rio corrente - go(Universidade Federal de Goiás, 2006-07-18) ALOÍSIO, Gustavo Ribeiro; ANGELINI, Ronaldo; http://lattes.cnpq.br/6739463859587165In this work, fishes of Corrente river, affluent of Paranaíba River (Paraná basin, Brazil), were studied. Five surveys in the period of June of 2003 had been carried out until June of 2005. The sampling was executed in 8 points distributed in the stream, riverbed and lagoon. In each point had been used a set of gillnets with different mesh size (between 12 and 60mm opposite knots). The nets were inspected in the morning and the end of the day. The results had shown that 8 species were captured and the most abundant specie is Astyanax altiparanae; Shannon-Wienner index demonstrated diversity low; Morisita index indicated that there are high similarity between river, stream and lagoons; all species reproduce in the rainy season with exception of the Brycon nattereri; it is demonstrated the existence of piscivores species, herbivores, insectivores and detritus feeders.Item Estrutura e interações tróficas em três lagoas marginais no Pantanal Sul(Universidade Federal de Goiás, 2010-03-25) MORAIS, Ronny José de; ANGELINI, Ronaldo; http://lattes.cnpq.br/6739463859587165In this study trophic interactions and flows of energy/matter of three lagoons in the Pantanal (MS) submitted to the annual flood pulse - Baia da Onça, Braço Morto Acima and Braço Morto Abaixo - were analyzed with models of mass balance constructed using the Ecopath software. Thus, the objectives were: (i) to describe the mechanisms that control the dynamics of trophic webs, (ii) to identify the major groups that act as keystone, (iii) to identify information gaps for these environments, (iv) to quantify the ecotrophic community and assess the degree of development of the ecosystem. In addition to several fish compartments in other groups were inserted to compose the models, such as phytoplankton, macrophytes, zooplankton, aquatic insects, terrestrial insects, birds, reptiles and mammals. The data from fish compartments were collected in 1988-1990 and the other compartments were taken from literature. To identify the groups that act as keystone an index that is based on the trophic impact matrix of each model was used. The results indicate that in the three models, biomass and number of species concentrated between trophic levels 2 and 3, suggesting that within these levels there is greater stability, allowing the coexistence of species. In the three models, the most effective contribution of the energy flow is observed from the detritus compartment to the trophic level II, highlighting the role of detritivores in the systems. The trophic impact matrix obtained for the three models confirms the participation of detritus and some compartments found in lower trophic levels (aquatic insects and zooplankton) over most of the groups in the models, suggesting a bottom up control system. However, the presence of top predators and their strong relationships with other groups suggest the presence of top-down effect. This is verified by analysis of the index of keystone, which in the three models is greater for detritus, Hoplias malabaricus, Serrasalmus spp, birds and mammals. So, there are in the three lagoons a matched control (bottom-up and top-down) with the acting of primary producers and higher trophic levels. The analysis of some ecosystem attributes, such as PP/R, Ascendency, Overhead and Ratio Schödinger show that the three systems are mature and have high resilience. This study is considered an initial step in the synthesis of ecological interactions about the Pantanal lagoons (MS) for that there are no studies with this approach to this ecosystem.Item Concordância espacial da assembléia de peixes de uma planície de inundação(Universidade Federal de Goiás, 2010-03-26) PEREIRA, Camila Leite; ANGELINI, Ronaldo; http://lattes.cnpq.br/6739463859587165The synchrony concept can be defined like the degree that different biologics systems show similar temporal evolution. Synchronies fluctuations in species are attributed to influence of ambient factors or individuals dispersion (distance of ambient). Thus, the objective this study was measured the ichthyofauna similarity among six environment of Parana River floodplain in responses to these different mechanisms. The biotic (ichthyofauna abundance) and abiotic (limnology gradients) dates was provided by NUPELIA. The statistical analyses supported in multivariate analyses applied in abundance matrices of fish species, limnology variables and connectivity distance among habitats. In such case the ichthyofauna dynamic varied asynchronous over time and space on the periods of 1987 to 19988 and 2006 to 2008. The period of greatest assemblage significant synchronies corresponded to intermediary period. The main reason of this synchrony was explain by the fluviometric quota, since the dynamic of this variable affected similarly the species abundance among locations. Altogether this study confirmed the theoretical support of Niche as a mechanism of assemblage synchrony in stable ecosystems. The neutral process wasn t a good model to explain the assemblage similarity between locations.