Invasive species: “back-seat drivers” of ecosystem change?
- 1.9k Downloads
Invasive species are often assumed to be the cause (drivers) of declines in native species and alterations of native ecosystems. However, an alternative model suggests that many invasive plants are better described as passengers of altered disturbance regimes or other changes in ecosystem properties. Some species do seem to be easily categorized as passengers or drivers, but others may be better described as “back-seat drivers”. Back-seat drivers require or benefit from disruptions of ecosystem processes or properties that lead to declines of native species but also contribute to changes in ecosystem properties and further declines of native species. Among these possibilities, drivers are a direct cause of the decline of native species through the introduction of novel traits or functions to an ecosystem, whereas back-seat drivers interact with ecosystem change to cause native species declines. Passengers are better considered as a symptom of an underlying problem, rather than the cause of native species declines. Driver, back-seat driver and passenger models suggest different associations between invasive species, ecosystem change and native species declines, and these models provide a framework for predicting and understanding the response of native species to invasive species management.
KeywordsBiodiversity Ecosystem change Exotic species Extinction Competition Disturbance
Heather Reynolds, Luke Flory, Rebecca Penny, and Stephen Friesen provided helpful comments that greatly improved this manuscript. Thank you to the Ecosystems and Global Change class at Indiana University for a thought-provoking discussion that inspired this review and to Jonathan Andicoechea for coining and sharing the term “back-seat drivers”.
- Anderson RC, Anderson MR, Bauer JT, Slater M, Herold JM, Baumhardt VA (2010) Effect of removal of garlic mustard (Alliaria petiolata Brassicaceae) on Arbuscular Mycorrhizal Fungi inoculum potential in forest soils. Open Ecol J 3:41–47Google Scholar
- Chapin FSI, Lubchenco J, Reynolds HL (1995) Biodiversity effects on patterns and processes of communities and ecosystems. In: Heywood VH (ed) Global biodiversity assessment. Cambridge University Press, Cambridge, pp 289–301Google Scholar
- Chapin FSI, Reynolds HL, D’Antonio CM, Eckhart VM (1996) The functional role of species in terrestrial ecosystems. In: Walker B, Stephen W (eds) Global change in terrestrial ecosystems. Cambridge University Press, Cambridge, pp 403–428Google Scholar
- Farnsworth EJ (2004) Patterns of plant invasions at sites with rare plant species throughout New England. Rhodora 106:97–117Google Scholar
- Lankau R (2010) Gradients in invader allelochemistry determine native plant growth and restoration strategies. Ecological Society of America Annual Meeting, PittsburghGoogle Scholar
- Viswanathan D, Aarssen LW (2000) Why biennials are so few: habitat availability and the species pool. Ecoscience 7:461–465Google Scholar