Ivan Jimenez

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Emerson and Kolm show that the proportion of species endemic to an island is positively related to its species richness and, assuming that endemism indexes speciation rate, they infer that greater species diversity accelerates diversification. Here we demonstrate that the same correlation between species richness and percentage endemism can arise even if(More)
5 The availability of huge amounts of multimedia documents requires a careful design and an efficient implementation of multimedia retrieval systems Storage, retrieval and browsing of not only textual, but also image, audio and video files MPEG-7 standard for describing multimedia documents using machine-consumable metadata descriptors Multimedia retrieval(More)
Species are commonly delimited on the basis of gaps in patterns of morphological variation, but there seems to be little recent work on methods to objectively assess such gaps. Here, we introduce a statistical approach that uses measurements of continuous morphological characters and geographic variation in those characters to (i) measure the strength of(More)
SUMMARY IntroductIon. In addition to different functional and structural deficits, cerebrovascular disease causes several types of restrictions in social participation. objectIve. The aim of this study was to describe the clinical, social and occupational characteristics as well as the self-perception in patients with cerebrovascular disease (stroke)(More)
Extinction risk has not been evaluated for 96% of all described plant species. Given that the Global Strategy for Plant Conservation proposes preliminary conservation assessments of all described plant species by 2010, herbarium specimens (i.e., primary occurrence data) are increasingly being used to infer threat components from estimates of geographic(More)
Multimedia information retrieval is vital for, among many other fields, design and engineering processes. Studies show that members of product development teams spend more and more time for information gathering and have less and less time for the creative aspects of their work. Here the combination of the still emerging Semantic Web [1] technologies and(More)
On-demand public transport satisfies many of the needs that traditional public transport, with fixed predetermined routes and schedules, cannot fulfill. Both schemas are able to work together, as it is discussed in this paper, being on-demand services a good alternative in the areas and time intervals where low demand makes fixed routes unsustainable. This(More)