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Now showing items 21-30 of 47
The balance of trade in alien species between South Africa and the rest of Africa
(AOSIS, 2017)
Background: Alien organisms are not only introduced from one biogeographical region to
another but also spread within regions. As South Africa shares land borders with six countries, multiple opportunities exist for the ...
Invasion trajectory of alien trees: the role of introduction pathway and planting history
(John Wiley & Sons Ltd., 2014)
Global change is driving a massive rearrangement of the world’s biota. Trajectories of distributional shifts are shaped by species traits, the recipient environment and driving forces with many of the driving forces directly ...
Evaluating habitat connectivity methodologies: a case study with endangered African wild dogs in South Africa
(Springer, 2016)
Context In fragmented landscapes, connectivity between subpopulations is vital for species’ persistence. Various techniques are used to assess the degree of connectivity between habitat patches, yet their performance is ...
Annual monitoring reveals rapid upward movement of exotic plants in a montane ecosystem
(Springer, 2015)
There is increasing evidence that invasive
species are threating montane ecosystems globally. However, trends in species distribution are difficult to observe directly due to a lack of data with suitable
spatio-temporal ...
An assessment of the information content of South African alien species databases
(AOSIS Publishing, 2015)
National alien species databases indicate the state of a country’s biodiversity and provide useful data for research on invasion biology and the management of invasions. In South Africa there are several different published ...
Forestry trial data can be used to evaluate climate-based species distribution models in predicting tree invasions
(Pensoft Publishers, 2014)
Climate is frequently used to predict the outcome of species introductions based on the results from species distribution models (SDMs). However, despite the widespread use of SDMs for pre- and post-border risk assessments, ...
Alien plant species that invade high elevations are generalists: support for the directional ecological filtering hypothesis
(International Association for Vegetation Science, 2017)
Questions: The richness of invasive alien plant species tends to decrease with
increasing elevation. This pattern may be due to alien plant species requiring
traits allowing survival at high elevations (the Abiotic ...
An assessment of rehabilitation success in an African grassland using ants as bioindicators
(AOSIS, 2016)
Many studies that evaluate rehabilitation make use of invertebrate bioindicators. Invertebrates, especially ants, make useful indicators as they are sensitive to environmental change. We compared ant assemblages in ...
The potential range of Ailanthus altissima (tree of heaven) in South Africa: the roles of climate, land use and disturbance
(Springer, 2017)
Invasive trees are a major problem in South Africa. Many species are well established
whereas others are still in the early stages of invasion. The management of invasive species is most cost effective at the early stages ...
Termite mounds differ in their importance for herbivores across savanna types, seasons and spatial scales
(Nordic Society Oikos, 2016)
Herbivores do not forage uniformly across landscapes, but select for patches of higher nutrition and lower predation risk. Macrotermes mounds contain higher concentrations of soil nutrients and support grasses of higher ...