DSpace Coleção:http://repositorio.uem.br:8080/jspui/handle/1/2372024-03-28T23:09:09Z2024-03-28T23:09:09ZVocalizações de Physalaemus cuvieri (ANURA, LEIUPERIDAE) ao longo do gradiente espacial no sul do Brasil.Gambale, Priscilla Guedeshttp://repositorio.uem.br:8080/jspui/handle/1/49322018-09-17T19:06:18Z2013-01-01T00:00:00ZTítulo: Vocalizações de Physalaemus cuvieri (ANURA, LEIUPERIDAE) ao longo do gradiente espacial no sul do Brasil.
Autor(es): Gambale, Priscilla Guedes
Abstract: Studies on sexual evolution, associated with behavioral issues are bound to work in anuran bioacoustics because they are animals that use vocalizations for reproduction and social interactions in choruses. In anurans, advances in bioacoustics try to associate social contexts in which vocalizations are emitted, influences of environment in which they live, other individuals in choruses and morphological characters on vocalizations, as well as evaluate the transmission of the signal emitted over long distances. Although these works started a long time ago, there is little information for the group, mainly in the Neotropical region, an area of high diversity of amphibians. The first approach of this study assessed the social context in which vocalizations of Physalaemus cuvieri were emitted, as well as influences of abiotic, morphological characters and distance between males on acoustic parameters. We observed that advertisement calls were emitted to territorial delimitation and attract females in all males, while courtship calls were emitted in a few individuals when females were distant less than 20 cm of males. Acoustic parameters were influenced by environmental, morphological and social characteristics, generating useful information for system evolution of sexual selection and aggressive interactions. We test too influence of environmental characteristics on acoustic parameters over long distances. Results show evidence that degradation and attenuation occur in advertisement call of Physalaemus cuvieri and they are influenced by environmental, not morphological characteristics. More robust characterizations of microhabitats is necessary to obtain results more evident, due to small size of frogs. Other parameters can also be associated with the evolution of signals over long distances as physiological and phylogenetic characteristics, parasites, predators and social context. In short, results not only contributed to greater knowledge about the biology of the species, but also to generate data still little known and generate insights for future comparative studies and the evolution of communication systems in anurans.2013-01-01T00:00:00ZVariáveis limnológicas e estruturais do habitat predizem a diversidade funcional e a composição das comunidades de peixes em lagoas de planície de inundação.Rodrigues, Amanda Cantarutehttp://repositorio.uem.br:8080/jspui/handle/1/49312018-09-17T19:05:04Z2018-01-01T00:00:00ZTítulo: Variáveis limnológicas e estruturais do habitat predizem a diversidade funcional e a composição das comunidades de peixes em lagoas de planície de inundação.
Autor(es): Rodrigues, Amanda Cantarute
Abstract: It was investigated in which way the environmental variation created on floodplain lagoons explains the variation of fish assemblages. It was evaluated one taxonomic index and two functional indices of fish communities from six floodplain lakes of the upper Paraná River floodplain, investigating if their changes depend of the same set of predictors. It was predict that the taxonomic richness will be more explained by limnological variables and the functional variation by environmental structural variables. The data comprise a time scale of 14 years. It was sampled eight limnological variables and four habitat structural variables, besides the water level. Fish samples were realized using seining nets. Functional diversity was evaluated from six functional traits, from which functional dispersion and functional redundancy for each sample were calculated, besides the taxonomic richness. Regression models were built utilizing the three indices as response variables and environmental variables as predictors of the community variation. The results showed that the taxonomic richness was influenced by limnological and structural variables. Functional dispersion significantly varied only with structural variables and functional redundancy with two limnological variables. In addition, it was found a high functional redundancy at these sites, varying significantly with concentration of chlorophyll in water in a negative way. This may suggests that oligotrophic environments present more similar species, possibly acting as an environmental filter, which coincides with the current oligotrophication process in the studied environment.2018-01-01T00:00:00ZVariáveis abióticas e espécie nativa competidora relacionadas ao sucesso de uma macrófita submersa invasora em diferentes escalas espaciais.Pulzatto, Mikaela Marqueshttp://repositorio.uem.br:8080/jspui/handle/1/49302018-09-17T19:05:04Z2018-01-01T00:00:00ZTítulo: Variáveis abióticas e espécie nativa competidora relacionadas ao sucesso de uma macrófita submersa invasora em diferentes escalas espaciais.
Autor(es): Pulzatto, Mikaela Marques
Abstract: The success of invasive species depends on the overcoming of physiological and biotic filters as these species pass through the invasion stages. Abiotic variables likely have greater relative importance over invasive at large spatial scales, while biotic interactions are more important on fine scales. Anthropogenic disturbances, such as reservoirs, may facilitate the process of invasion by submerged aquatic macrophytes. In this study, we evaluated the relative importance of the abiotic factors and of a competitive native species on the performance of the invasive submerged macrophyte Hydrilla verticillata. Samplings were conducted in two spatial scales (macrophytes patch and quadrat) to evaluate how the relative importance of the abiotic factors and the competitive native vary between scales. The relative abundance (large scale) and biomass (fine scale) of hydrilla and the competing species were collected along with environmental variables in a large subtropical reservoir. Bayesian Generalized Linear Models and a selection of models using the Akaike Information Criterion were used. At large scale, the abiotic variables maximum fetch (positive correlation), turbidity and conductivity (negative correlation) were the most important to explain the hydrilla abundance, while littoral slope and competitive native species (positive correlation) presented less relative importance. At fine scale, both abiotic variables, alkalinity and total organic matter of the sediment, and competitive native species (negative correlation) were the most important. Depth, turbidity and maximum fetch exhibited less relative importance. Our results suggest that at the large scale the strength of biotic interactions decreases as the variation of environmental conditions increases, indicating greater importance of abiotic factors. At the small scale, most individuals have the potential to interact directly with each other, evidencing the importance of biotic interactions. However, in aquatic environments, biotic resistance is generally less important than environmental resistance, indicated in this study by the great importance of abiotic variables even in fine scale. Environmental heterogeneity may explain the positive correlation between native and invasive on a large scale, while the negative correlation in restricted scale suggests the effect of competition. In synthesis, we show that the abiotic factors that explain the invasion success of a submerged invasive macrophyte are basically the same in two spatial scale, but the importance of biotic interactions changed with scale. Thus, our data suggest that spatial scales must be taken into account in models to explain the success of invasive macrophytes.2018-01-01T00:00:00ZVariações populacionais e intrapopulacionais de um pimelodídeo omnívoro : efeitos da dinâmica sazonal em uma planície de inundação Neotropical.Fernandes, Alessandrahttp://repositorio.uem.br:8080/jspui/handle/1/49252018-09-17T19:03:40Z2015-01-01T00:00:00ZTítulo: Variações populacionais e intrapopulacionais de um pimelodídeo omnívoro : efeitos da dinâmica sazonal em uma planície de inundação Neotropical.
Autor(es): Fernandes, Alessandra
Abstract: Although intra-population variation in niches is a widespread phenomenon in animal populations to fish these studies remain poorly understood. It is known that for these animals the individual variation in the use of resources can result from environmental differences in food availability, promoted by space and/or seasonal differences. Based on this, we investigated the populational and within-population variations in the diet of Pimelodus maculatus, in the dry and wet seasons in the lagoons of the Pantanal, Mato Grosso, Brazil. In the dry season the diet was based mainly on scale, fish and detritus while in wet season on fruit and seed, showing a significant difference. The trophic niche breadth values were relatively low and seasonally similar. High values of variation between individuals in the diet (E) and low values of the degree of clustering (Cws) regardless of season were found. The combination of these values showed that in the population there are specialists and generalists individuals indicating one nested diet. The median individual specialization index (PSi) was statistically lower in wet season, showing that individuals were more specialists. Thus, the seasonal availability of resources appears to be the main mechanism for the diet specialization in both population and individual level.2015-01-01T00:00:00Z