The results showed that the richness of alien species is still increasing in Italy, while native species are decreasing. In The spread of exotic fishes in the Italian rivers and their effect on native fish fauna during the last three decades the authors analysed 30-years of data recording (1985–2014) of fishes in Italy (BioFresh Project) with the aim to investigate the effects of introduced alien fish species on native species.
Throughout, we have tried to provide new insights into such an important, and yet still under-studied area of research and scientific practice. Yet, the management of the most invasive alien species is still challenging or an unsolved problem all over the world.įor precisely these reasons, at Biodiversity journal, we felt it was high time we curated a themed issue, sharing examples from around the globe, on Invasive Alien Species and Biodiversity: Impacts and Management. mainly over the last century) to really understand the response of the native species assemblages and ecosystems. Numerous IAS can colonize, with different strengths, ecosystems in different bioregions of the world whilst on the other hand, biological invasions are a continuous phenomenon and so far only observed for too short a period (i.e. Citation2014).Įven though environmental issues caused by IAS are recognized worldwide, knowledge on their current and future impacts on native biodiversity is still largely unknown (Downey and Richardson Citation2016 Essl et al. Economic damages due to IAS should include costs related to the direct damage caused by the species as well as those to be ascribed to their prevention, control and management (Marbuah et al. Besides biodiversity loss, the most recent literature on IAS has pointed out that these species have negative impacts on agriculture, ecosystem services and human well-being (including human health), ultimately causing serious economic problems (Pejchar and Mooney Citation2009 McGeoch et al. ( Citation2016), IAS are the second most frequent threat connected with species’ extinction events since 1500. Particularly, according to Bellard et al.
#Alien invasion 2021 drivers
Today, biological invasions are considered among the main drivers causing biodiversity loss and species extinctions in the major plant and animal taxa across the world (IUCN Citation2017 Dueñas et al. interspecific hybridization) to the ecosystem and landscape level (Largiadèr Citation2008 Kumschick et al. Over the last 30 years, numerous studies have demonstrated the negative effect of IAS on native biodiversity from the genetic (e.g. Indeed, the number of new recordings of invasive alien species (IAS) have incessantly increased worldwide during the last 200 years, but more than a third of all first introductions were recorded between 19 (Seebens et al. A combination of colonial rule, rapid economic development and increasing global trade exchanges across continents and borders have had a key role in human-mediated movement of propagules and species and have led to the subsequent establishment of non-native species in new regions outside their natural range (Turbelin et al. The ‘father’ of invasion biology, Charles Elton, defined biological invasions as ‘ecological explosions’ meaning ‘the enormous increase in number of some organism’ in newly invaded ranges (Elton Citation1958). It was however only after the 1950s that scientists became aware that biological invasions can have a deleterious effect on habitats and ecosystems (Elton Citation1958 Macdonald and Jarman Citation1984 Davis Citation2009). These were defined as ‘species outside of their bioregion which can possibly threaten native ones (De Candolle Citation1855 Darwin Citation1859 Pyšek et al. As far back as the 18th century, many naturalists including Augustin Pyramus De Candolle and Charles Darwin, observed the phenomenon of non-native species.
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