University of Johannesburg

About: University of Johannesburg is a education organization based out in Johannesburg, South Africa. It is known for research contribution in the topics: Population & Context (language use). The organization has 8070 authors who have published 22749 publications receiving 329408 citations. The organization is also known as: UJ.

Search for new phenomena in events with at least three photons collected in pp collisions at √s = 8 TeV with the ATLAS detector

Abstract: Results of a search for new phenomena in events with at least three photons are reported. Data from proton-proton collisions at a centre-of-mass energy of 8 TeV, corresponding to an integrated lumi ...

Influence of tree shape and evolutionary time-scale on phylogenetic diversity metrics.

Abstract: During the last decades, describing, analysing and understanding the phylogenetic structure of species assemblages has been a central theme in both community ecology and macro-ecology. Among the wide variety of phylogenetic structure metrics, three have been predominant in the literature: Faith's phylogenetic diversity (PDFaith), which represents the sum of the branch lengths of the phylogenetic tree linking all species of a particular assemblage, the mean pairwise distance between all species in an assemblage (MPD) and the pairwise distance between the closest relatives in an assemblage (MNTD). Comparisons between studies using one or several of these metrics are difficult because there has been no comprehensive evaluation of the phylogenetic properties each metric captures. In particular it is unknown how PDFaith relates to MDP and MNTD. Consequently, it is possible that apparently opposing patterns in different studies might simply reflect differences in metric properties. Here, we aim to fill this gap by comparing these metrics using simulations and empirical data. We first used simulation experiments to test the influence of community structure and size on the mismatch between metrics whilst varying the shape and size of the phylogenetic tree of the species pool. Second we investigated the mismatch between metrics for two empirical datasets (gut microbes and global carnivoran assemblages). We show that MNTD and PDFaith provide similar information on phylogenetic structure, and respond similarly to variation in species richness and assemblage structure. However, MPD demonstrate a very different behaviour, and is highly sensitive to deep branching structure. We suggest that by combining complementary metrics that are sensitive to processes operating at different phylogenetic depths (i.e. MPD and MNTD or PDFaith) we can obtain a better understanding of assemblage structure.

Destructive creation: capital accumulation and the structural violence of tourism

Abstract: Tourism is not merely a capitalist practice but a central practice through which capitalism sustains itself. Precisely how tourism “products” become capital and the types of violence this process entails, however, has not yet been systematically theorized or investigated. Building on Noel Castree's six principles of commodification, we explore how tourism becomes capital, understood as “value in motion”, and how this process not only provokes various forms of material violence but can become a form of (structural) violence in its own right. Based on research in tourism settings in Southern Africa and Latin America and general trends in international tourism, we argue that three integrated forms of structural violence to both humans and non-human natures are especially prominent, namely the systematic production of inequalities, waste and “spaces of exception”. As a global industry crucially dependent on integrated material and discursive forms of value creation, we also show that these forms of st...