Now showing items 1-10 of 11
Summary of South African Traffic Monitoring Data (1994-2006)
Mikros Traffic Monitoring (Pty) Ltd provides a traffic data collection service to various clients. Their biggest client is the South African National Roads Agency for which they operate in the order of 350 Permanent & ...
Karoo road verge study: Plot waypoints in UTM format
This zipped geodataset provides the location of the 240 plots. Additional plot-level environmental data include: - Lat/long position in decimal degrees - annual precipitation (Lynch 2003) - altitude - distance (km) ...
Insect thermal tolerance: what is the role of ontogeny, ageing and senescence?
(Cambridge Philosophical Society, 2008)
Temperature has dramatic evolutionary fitness consequences and is therefore a major factor determining the geographic distribution and abundance of ectotherms. However, the role that age might have on insect thermal tolerance ...
Adaptive rather than non-adaptive evolution of Mimulus guttatus in its invasive range
(Elsevier GmbH, 2008)
Adaptive and non-adaptive evolutionary processes are likely to play important roles in biological invasions but their relative importance has hardly ever been quantified. Moreover, although genetic differences between ...
Road verges as invasion corridors? A spatial hierarchical test in an arid ecosystem
Disturbed habitats are often swiftly colonized by alien plant species. Human inhabited areas may act as sources from which such aliens disperse, while road verges have been suggested as corridors facilitating their dispersal. ...
Karoo road verge study: Plot level sample data
File belonging to Kalwij et al 2008. This is a multivariate dataset at the plot level (n=240) whereby the Braun-Blanquet cover estimation of exotic species is listed for each plot. In addition a sheet with environmental ...
Karoo road verge study: Transect level sample data
Transect level data belonging to Kalwij et al. 2008. This dataset contains the Braun-Blanquet cover estimation of the 720 transects and their environmental data
Selection on floral traits through male fertility in a natural plant population
(Springer Science+Business Media B.V., 2008)
Most studies on selection in plants estimate female fitness components and neglect male mating success, although the latter might also be fundamental to understand adaptive evolution. Information from molecular genetic ...
Dynamics of the functional groups in the weed flora of dryland and irrigated agroecosystems in the Gangetic plains of India
(Weed Science Society of Japan, 2008)
The relative abundance of the weed functional types in dryland and irrigated rice in the Kharif (summer) crop field and dryland lentil and wheat in the irrigated Rabi (winter) crop field was studied at the agricultural ...
Taxonomic homogenization in ungulates: patterns and mechanisms at local and global scales
(Blackwell Publishing Ltd, 2008)
Aim The aim of this paper is to examine taxonomic homogenization in ungulates globally and at the local scale in South Africa. Specifically, we aim to examine the roles of distance, scale, time, extinctions vs. ...