propagule pressure

Read more about the article Water canals as invasion highways for alien fish species
The Sundays Valley water-transfer canal, which distributes water and fishes from the Orange-Fish-Sundays Inter-Basin Water Transfer Scheme to hundreds of irrigation ponds used for citrus farming.
2014 / News

Water canals as invasion highways for alien fish species

Freshwater fish invasions are a major source of environmental homogenisation around the world; unique species assemblages are increasingly being overwhelmed by large numbers of introduced species. While active human-mediated introductions contribute to this process, there are also many passive pathways of fish introductions.

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29 January 2014
Read more about the article New insights on risks associated with key stages in biological invasions
Percent of qualitative/semi-quantitative (a) and quantitative (b) risk assessments considering the different stages of the invasion process, split into models containing different numbers of TEASI components (Transport, Establishment, Abundance, Spread, Impact).
2012 / Highlighted papers

New insights on risks associated with key stages in biological invasions

The human-mediated movement of species around the world has added several layers of complexity to the management of ecosystems. Once alien species are established in a new region they are extremely difficult or impossible to eradicate, and control is expensive and often ineffective.

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8 October 2012
Read more about the article Continent-wide risk assessment for the establishment of alien species in Antarctica
A risk index, based on propagule pressure and origins, and the climatic suitability of the ice-free areas of the continent, indicated that alien species is currently most likely to establish in the Antarctic Peninsula and in western Ross Sea region. The map illustrates the relative risk of alien vascular plants establishing in Antarctica. Insets show risk index detail for the Antarctic Peninsula and the western Ross Sea.
2012 / Highlighted papers

Continent-wide risk assessment for the establishment of alien species in Antarctica

Antarctica is regarded as one of the most pristine environments on Earth. There is, however, a growing concern that the icy continent is being threatened by alien species that are accidentally being brought to the continent in the luggage of tourists and scientists.

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20 March 2012