Learn More
– This paper focuses on the statistical properties of wild-land fires and, in particular , investigates if spread dynamics relates to simple invasion model. The fractal dimension and lacunarity of three fire scars classified from satellite imagery are analysed. Results indicate that the burned clusters behave similarly to percolation clusters on boundaries(More)
Rarefaction represents a powerful method for calculating the expected number of species as a function of sampling effort. For this reason, it is widely used in community ecology and biodiversity research. The technique was introduced by Sanders (1968), based on the observation that species richness obtained from a sample of n individuals increases with n.(More)
The diversity of a species assemblage has been studied extensively for many decades in relation to its possible connection with ecosystem functioning and organization. In this view most diversity measures, such as Shannon's entropy, rely upon information theory as a basis for the quantification of diversity. Also, traditional diversity measures are computed(More)
Biological diversity would apparently seem the most intuitive and easily studied of all the ecological concepts. However, in practice biodiversity has suffered from great number of definitions that vary with the specific needs of the different researchers, thus making it extremely confusing as an ecological concept. In this paper, I shortly review the(More)
The degree to which abundances are divided equitably among community species or evenness is a basic property of any biological community. Several evenness indices have thus far been proposed in ecological literature. However, despite its vast potential applicability in ecological research, none seems to be generally preferred. Furthermore, only very few(More)
Understanding the causes and effects of species invasions is a priority in ecology and conservation biology. One of the crucial steps in evaluating the impact of invasive species is to map changes in their actual and potential distribution and relative abundance across a wide region over an appropriate time span. While direct and indirect remote sensing(More)
a r t i c l e i n f o Available online xxxx Keywords: Biodiversity Diversity metrics GRASS GIS Landscape ecology r.diversity Spectral variability The assessment of species diversity in relatively large areas has always been a challenging task for ecologists, mainly because of the intrinsic difficulty to judge the completeness of species lists and to(More)
In this study we analyzed patterns of native and exotic species richness in the urban flora of Brussels (Belgium) using a coarse-scale systematic sampling grid of 1 km 2. The observed correlation between native and exotic richness within the grid cells sampled was then compared to the results of an adequate null model assuming no species interactions. In(More)
Assessing the effects of environmental constraints on community structure often relies on methods that consider changes in species functional traits in response to environmental processes. Various indices have been proposed to measure relevant aspects of community trait composition from different viewpoints and perspectives. Among these, the(More)
a r t i c l e i n f o Environmental heterogeneity is considered to be one of the main factors associated with biodiversity given that areas with highly heterogeneous environments can host more species due to their higher number of available niches. In this view, spatial variability extracted from remotely sensed images has been used as a proxy of species(More)