Read more about the article How many invasive species can our ecosystems tolerate?
Mice are the most widely distributed vertebrate in the world due to historical shipping and trade patterns. The image shows a mouse hitchhiking on marine ropes (photo: James Russell). This is but one example of the many species that are introduced accidentally as a result of tourism. More work is needed to fully understand the role of different pathways in introducing non-native species and to find ways of managing these pathways to reduce the associated risks.

How many invasive species can our ecosystems tolerate?

An increase of 20 to 30 percent in the number of invasive alien species will lead to dramatic biodiversity loss worldwide. This is one conclusion of a study by an international team of researchers led by C·I·B associate Franz Essl that was published in the journal Global Change Biology.

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Read more about the article Invasive plants are more phytochemically diverse than native counterparts
Triffid weed (Chromolaena odorata) - one of the invasive alien plants that pose severe ecological threats in the Kruger National Park, South Africa. (Photo credit: Llewellyn Foxcroft)

Invasive plants are more phytochemically diverse than native counterparts

When comparing three invasive alien plants (IAP) in South Africa to their native counterparts in the United States, a clear increase in phytochemical diversity in the invaded region was found, highlighting the role of secondary metabolites in plant invasions.

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Read more about the article Controlling famine weed under elevated CO2: a troubling future ahead?
Famine weed (Parthenium hysterophorus) stands to benefit in terms of both growth and reproduction under elevated CO2 levels. These increases in growth are likely to make the weed less susceptible to herbicides, particularly glyphosate, in the future (Graphic by Blair Cowie).

Controlling famine weed under elevated CO2: a troubling future ahead?

A paper published in the journal Pest Management Science showed that herbicide is likely to become less effective in controlling the invasive famine weed (Parthenium hysterophorus) in the future as CO2 levels rise.

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Read more about the article Invasive alien species in protected areas: a threat that should not be overlooked
Famine weed (Parthenium hysterophorus) is an aggressive invader in the Kruger National Park, South Africa. (Photo credit: Thembeka Thwala)

Invasive alien species in protected areas: a threat that should not be overlooked

In this commentary, a group of researchers, including C∙I∙B researchers and former C∙I∙B students, argue that when protected areas containing invasive alien species (IAS) are subjected to protected area downgrading, downsizing, and degazettement (PADDD), there is a higher chance that IAS will cause environmental and socioeconomic effects.

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Read more about the article Sour fig changes invertebrate diversity in the invasive range, C·I·B study shows
Carpobrotus edulis, native to South Africa, is invasive in the coastal areas of the Iberian Peninsula (Galicia, Spain). (Photo credit: Jonatan Rodríguez)

Sour fig changes invertebrate diversity in the invasive range, C·I·B study shows

The invasive plant sour fig (Carpobrotus edulis: also known as Hottentot-fig, ice plant, highway ice plant, or pigface) can have a clear impact reducing the abundance of native invertebrates, with substantial effects on herbivores.

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