DSpace Coleção:http://repositorio.uem.br:8080/jspui/handle/1/3142024-03-29T14:41:08Z2024-03-29T14:41:08ZZonação, variabilidade e inter-relação da fauna de peixes de dois reservatórios do rio Iguaçu, Paraná, Brasil.Baumgartner, Dirceuhttp://repositorio.uem.br:8080/jspui/handle/1/51212018-09-17T19:25:32Z2010-01-01T00:00:00ZTítulo: Zonação, variabilidade e inter-relação da fauna de peixes de dois reservatórios do rio Iguaçu, Paraná, Brasil.
Autor(es): Baumgartner, Dirceu
Abstract: This study aimed to evaluate the formation of longitudinal and vertical gradients (zonation) of fish fauna and limnological variables, as well as assess the variability of abundance and interrelation of fish species from the Salto Osório (run-of-river) and Salto Santiago (water storage) reservoirs, both positioned in the central region of the Iguaçu River reservoirs cascade. For this, samples were taken monthly during the period from July 2003 to June 2005, and bimonthly from July 2005 to May 2006 for fish, and bimonthly from July 2003 to May 2006 for limnological variables. Data were obtained from three sampling stations in the longitudinal axis (herein named riverine, transitional and lacustrine zones) and two sampling stations in the vertical axis (surface and bottom). This study was divided into two chapters, the first entitled "Effect of dam operation on formation of longitudinal and vertical gradients in reservoirs of the Iguaçu River, Paraná, Brazil" aimed to evaluate if reservoirs with different operation systems presented differences in limnological and ichthyological variables according to vertical and longitudinal directions of the reservoirs. Another objective was to verify if there were increasing differences in the longitudinal direction of the reservoir, which would indicate formation of gradients. In the second chapter, entitled "Variability and inter-relation of the ichthyofauna from the Salto Osorio (run-of-river) and Salto Santiago (water storage) reservoirs, Iguaçu River, Paraná, Brazil", the variability (by the coefficient of variation) of the species abundance was estimated, which was correlated with hydrological variables to observe possible influences of these variables on the regulatory mechanisms of the assemblage. Inter-relation was assessed from the dominant eigenvalue of the error covariance matrix of first-order autoregressive models of species abundances in the reservoirs. We tried from these metrics to identify whether reservoirs with different operations types had different behaviors.2010-01-01T00:00:00ZVocalizações e atividade acústica de anuros brasileiros : conhecimento atual, novas descrições e variação temporal em múltiplas escalas.Batista, Vinicius Guerrahttp://repositorio.uem.br:8080/jspui/handle/1/51202018-09-17T19:25:32Z2018-01-01T00:00:00ZTítulo: Vocalizações e atividade acústica de anuros brasileiros : conhecimento atual, novas descrições e variação temporal em múltiplas escalas.
Autor(es): Batista, Vinicius Guerra
Abstract: Acoustic signals of anurans are important mechanisms of reproductive isolation and provide informative characters for identification and delimitation of the species, being used in studies of behavioral, ecology, conservation, taxonomy, biodiversity inventories and influence of environmental impacts on species. In this thesis, we reviewed and measured the knowledge about the advertisement calls of Brazilian anurans, contributing with this knowledge when describing new calls, and also analyzing the temporal variation of the acoustic activity of different species and communities, evaluating the influence of different environmental and social factors. We identified a large knowledge gap regarding call descriptions. Calls of Rhinella abei, Limnomedusa macroglossa e Boana jaguariaivensis were described. Additionally, we evaluated the variation of acoustic parameters in Physalaemus centralis. In relation to the three sympatric Dendropsophus species studied (D. cruzi, D. minutus and D. rubicundulus), there was partition of the acoustic space, as well as of the calling sites. Besides, the Dendropsophus modified their acoustic parameters throughout the night, which may be associated with female preferences or to decrease energetic costs to maintain vocalization activity throughout the reproductive season. At the community level, the anurans presented a circadian pattern, with temporal niche overlap in the acoustic activity during the night, although when evaluated separately the species presented different periods of maximum vocal activity. Climatic variables act as driving factors to determine acoustic activity and the species may use different strategies to avoid overlap in the acoustic niche and facilitate coexistence.2018-01-01T00:00:00ZVariáveis relacionadas com a distribuição regional, dominância e estruturação de comunidades de peixes em riachos.Oliveira, Fagner Junior Machado dehttp://repositorio.uem.br:8080/jspui/handle/1/68052022-09-07T19:13:16Z2020-01-01T00:00:00ZTítulo: Variáveis relacionadas com a distribuição regional, dominância e estruturação de comunidades de peixes em riachos.
Autor(es): Oliveira, Fagner Junior Machado de
Abstract: Different ecological processes (e.g., rescue effect, environmental filtering, limiting similarity and dispersal) shape the structure of ecological communities. These processes, which are related to the theories of metapopulation and metacommunities, guided this study. For this purpose, data from fish communities in streams in the Upper Araguaia river basin (Mato Grosso and the Goiás States, Brazil) were used. It was observed that the regional distribution of fish species was modelled according to niche attributes (position and breadth), body size, trophic position, and swimming capacity. The results indicated that average abundance, niche position and niche amplitude predict the regional distribution of the species. Taken together, these results suggest the importance of metapopulation dynamics and niche-based processes explaining the regional distribution of species in the studied system. At another time, it was tested whether the abundance of subordinate species (i.e., any species that are not dominant in a local community) was correlated with the functional distance between dominant and subordinate species. In the results, a negative relationship between these quantities and that the subordinate species had larger body sizes compared to the dominant species in the local communities. These results also suggest that species filtering is more important than the interspecific competition to explain the patterns of species abundance distribution. In this study, was analyzed the relative importance of local environmental, landscape and spatial variables in structuring fish communities in streams of “veredas” (small wetlands in the Cerrado). The local environmental variables, after controlling the effect of space, were clearly more important than those obtained at the landscape scale. In view of the observations, it is concluded that the use of landscape data, in studies seeking environmental correlates of local community structure, should not occur at the expense of obtaining local variables (mainly those related to the habitat structure). The results of the three investigations in this study shown the predominant role of local environmental filters in the structuring of the fish communities analyzed. Species with high niche amplitude tend to have wide regional distributions and small-bodied ones tend to be locally dominant.2020-01-01T00:00:00ZVariáveis ambientais predizem a estrutura da comunidade parasitária de Moenkhausia forestii em ambientes semi-lóticos em uma planície Neotropical.Oda, Fabrício Hiroiukihttp://repositorio.uem.br:8080/jspui/handle/1/51192018-09-17T19:25:32Z2014-01-01T00:00:00ZTítulo: Variáveis ambientais predizem a estrutura da comunidade parasitária de Moenkhausia forestii em ambientes semi-lóticos em uma planície Neotropical.
Autor(es): Oda, Fabrício Hiroiuki
Abstract: The biology and ecology of small fishes are poorly studied in Brazil. Aspects such as the small size and low commercial value are probably two factors that decrease the interest in studying these organisms. However, small size fishes have an important ecological role in the aquatic ecosystems, because they are food source for many animal groups. Natural events and human activities in aquatic environments such as construction of dams, alter the hydrological regime of water bodies, which affect the biological condition of the fish, influencing directly and indirectly the parasite community. By presenting an intimate relationship with their hosts and the surrounding environment, the parasites are excellent models for the study of different organizational patterns at different scales. Host characteristics, such as diet, body size, vagility, and reproductive behavior, which can be affected by variations in the characteristics of aquatic environments, also influence the structure of parasite communities. In addition, in the life cycle of the parasites, the small size fish can act as intermediaries and/or parathenic hosts because they serve as food for fish and other species of various groups of animals, which are considered definitive hosts. The upper Paraná River floodplain presents a wide variety of environments including lotic, lentic and semilotic water bodies, swamps, and other types of habitat completely covered by aquatic vegetation. This diversity of environments associated with the presence of macrophytes support high abundances of individuals and species of fish, including sedentary species of small size. Shoals of these species are commonly found in lentic and semi-lotic environments associated with macrophyte, which may result in differences in exposure to parasites. The study of parasites of small size fishes will enable the understanding of the mechanisms that affect parasite-host interaction as well as the environmental factors that drive the structuring of their parasitic communities. From these informations two studies on the parasitic fauna of the red eye tetra Moenkhausia forestii collected in semilotic environments from upper Paraná River floodplain were developed: (i) the effect of abiotic variables on the parasite community structure of a small size fish in a Neotropical floodplain, and (ii) organization of parasitic infracommunities of a small size fish from Upper Paraná River floodplain, Brazil.2014-01-01T00:00:00Z