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Recently, community ecologists are focusing on the relative importance of local environmental factors and proxies to dispersal limitation to explain spatial variation in community structure. Albeit less explored, temporal processes may also be important in explaining species composition variation in metacommunities occupying dynamic systems. We aimed to(More)
In this paper we present a method for applying 2D textures onto composite and articulated objects defined by implicit functions. The method generates a particle system associated with the gradient vector field of an implicit function which acquires texture coordinates at a support surface. By extending this method to composite objects, an implicit surface(More)
We present a new method for adaptive polygonization of parametric surfaces. The method combines recursive simplicial subdivision of the domain and point sampling along curves on the surface. We avoid cracks in the polygonal mesh by determining the optimal sampling rate along the edges of a cell before subdividing it. The method is suitable for surfaces with(More)
This paper describes a unified framework for the problems of modelling and processing geographical entities. We propose a general definition of geographical objects, and show that the different types of geographical data can be expressed as particular cases of this definition. Furthermore, we present a taxonomy for the various types of GIS operations,(More)
Water flow management has significantly changed the natural dynamic of floods, which are responsible for the structure and dynamic of aquatic communities in river-floodplain systems. With the aim to elaborate a conceptual framework that describes the main ecological factors associated with zooplankton community structure in the Upper Paraná River, we(More)
This paper emphasizes the participation of the whole body in the interaction process in art, which becomes essential in the development of new insights and artistic expressions. We approach the postmodernism and the post-medium condition, having in mind the remediation process between digital and analog media to rethink the possibilities of interactive art(More)
We evaluated the relative importance of bottom-up and top-down mechanisms in controlling the density of a heterotrophic nanoflagellate (HNF) community in a shallow lake (Guaraná Lake) on the Paraná River floodplain (State of Mato Grosso do Sul, Brazil). Samples were taken monthly from March 2007 through February 2008, in three strata (surface, middle and(More)