Invasive species can also be native…

Valéry, Loïc; Fritz, Hervé; Lefeuvre, Jean‐Claude; Simberloff, Daniel

doi:10.1016/j.tree.2009.07.003

Cited by 121 publications

(80 citation statements)

References 11 publications

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“…This tension between a shared definition and a much broader understanding of key notions is also more generally apparent in the biological invasion literature. Indeed, many of the difficulties in operationalizing definitions of non-native and invasive species that we uncovered in this study can be found scattered throughout the literature (Garrott et al 1993, Shrader-Frechette 2001, Brown and Sax 2004, Sagoff 2005, Warren 2007, Davis 2009, Valéry et al 2009, Rotherham and Lambert 2011, Young and Larson 2011, Webber and Scott 2012.…”

Section: Diverging Understandings Of Basic Conceptsmentioning

confidence: 99%

“…Furthermore, the positive values of non-native species for conservation are increasingly discussed in the literature (Ewel and Putz 2004, Kueffer and Daehler 2009, Kueffer et al 2010, Goodenough 2011, Schlaepfer et al 2011, triggering critical responses (e.g., Vitule et al 2012, Richardson andRicciardi 2013). Then again, native species are sometimes considered to be invasive (Valéry et al 2009, Carey et al 2012 in disagreement with standard definitions ). These conflicting perspectives on invasive organisms and their effects on ecosystems can impede conservation action.…”

Section: Introductionmentioning

confidence: 99%

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Understanding misunderstandings in invasion science: why experts don’t agree on common concepts and risk assessments

Humair¹,

Edwards²,

Siegrist³

et al. 2014

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Understanding the diverging opinions of academic experts, stakeholders and the public is important for effective conservation management. This is especially so when a consensus is needed for action to minimize future risks but the knowledge upon which to base this action is uncertain or missing. How to manage non-native, invasive species (NIS) is an interesting case in point: the issue has long been controversial among stakeholders, but publicly visible, major disagreement among experts is recent.To characterize the multitude of experts' understanding and valuation of non-native, NIS we performed structured qualitative interviews with 26 academic experts, 13 of whom were invasion biologists and 13 landscape experts. Within both groups, thinking varied widely, not only about basic concepts (e.g., non-native, invasive) but also about their valuation of effects of NIS. The divergent opinions among experts, regarding both the overall severity of the problem in Europe and its importance for ecosystem services, contrasted strongly with the apparent consensus that emerges from scientific synthesis articles and policy documents. We postulate that the observed heterogeneity of expert judgments is related to three major factors: (1) diverging conceptual understandings, (2) lack of empirical information and high scientific uncertainties due to complexities and contingencies of invasion processes, and (3) missing deliberation of values. Based on theory from science studies, we interpret the notion of an NIS as a boundary object, i.e., concepts that have a similar but not identical meaning to different groups of experts and stakeholders. This interpretative flexibility of a concept can facilitate interaction across diverse groups but bears the risk of introducing misunderstandings. An alternative to seeking consensus on exact definitions and risk assessments would be for invasive species experts to acknowledge uncertainties and engage transparently with stakeholders and the public in deliberations about conflicting opinions, taking the role of honest brokers of policy alternatives rather than of issue advocates. NeoBiotaFranziska Humair et al. / NeoBiota 20: 1-30 (2014) 2

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Section: Diverging Understandings Of Basic Conceptsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Understanding misunderstandings in invasion science: why experts don’t agree on common concepts and risk assessments

Humair¹,

Edwards²,

Siegrist³

et al. 2014

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“…Some species introduced by human beings are indeed destructive, for instance, zebra mussels (Dreissena polymorpha) in the Great Lakes, while in other places they can increase biodiversity (the honeysuckle, for instance, favors native bird species in Pennsylvania; Davis et al 2011). It is also possible for native species to have similar devastating effects (Valéry et al 2009). Because it is impossible to return to past ecosystems that have been increasingly transformed by a plethora of irreversible drivers of change (climate change, nitrogen eutrophication, increased urbanization, and other land-use changes), there has been an increased push to acknowledge 'novel ecosystems' (Chapin and Starfield 1997), which are composed of new combinations of species under new abiotic conditions.…”

Section: Introductionmentioning

confidence: 99%

Nuisance species: beyond the ecological perspective

Lepetz

Prévot‐Julliard

2014

Ecol Process

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Introduction: 'Nuisance species' (or 'invasive' species) are often proposed to be the second most important concern in the context of the current biodiversity crisis. Despite increasing evidence that exotic species do not always become invasive, this perception is still common in the scientific community. This suggests that other issues are at stake in the concept of nuisance species rather than just the problems they raise, grounded mostly in ecological or economic arguments.

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“…Esselink et al, 2000). Although Elymus athericus is a native species, usually growing in the upper parts of salt marshes, we hereby use the adjective native invasive, as the strong dominance of a single species can be assimilated to an invasion in this case (Valéry et al, 2009a). In the Mont Saint-Michel bay, this plant covers now 35% of the whole marsh (to be compared with 3% in 1984) with a current progression of 105 ha/year (A. Radureau and L. Valéry, unpublished data, 2007).…”

Section: Introductionmentioning

confidence: 99%

Comparison of reproductive traits between two salt-marsh wolf spiders (Araneae, Lycosidae) under different habitat suitability conditions

et al. 2011

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Salt-marsh invasions by the grass Elymus athericus (Poaceae) recently transformed usual areas dominated by Atriplex portulacoides (Chenopodiaceae) into homogeneous meadows. Two wolf spider species, Pardosa purbeckensis and Arctosa fulvolineata, show contrasting densities and habitat preferences in salt marshes (respectively dominant and co-dominant ground-living spiders) and oppositely respond to the grass invasion. This allowed us to test whether invasive species that alter habitat structure affect reproduction in addition to previously recorded changes in density. Reproductive traits (female mass, cocoon mass, number and volume of eggs, hatched cocoon as a proxy of reproduction date) were studied in both invaded and natural salt marshes during 2007 and 2008 in the Mont St-Michel Bay (France). In both species, reproductive outputs (cocoon mass) were higher in optimal habitats and volume of eggs was found to be independent from female mass, whereas the latter significantly influenced the number of eggs. In A. fulvolineata, lower reproductive outputs due to less numerous although larger eggs were found in suboptimal habitats whereas the opposite pattern was found in optimal habitats, showing the existence of plastic phenotypic trade-offs in habitats of different qualities. In P. purbeckensis, despite differences in population size among habitats, no reproductive trade-off was found. This study thus shows that two sympatric species belonging to the same family can differ in reproductive strategies and phenotypic plasticity under changes in habitat suitability.

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Invasive species can also be native…

Cited by 121 publications

References 11 publications

Understanding misunderstandings in invasion science: why experts don’t agree on common concepts and risk assessments

Understanding misunderstandings in invasion science: why experts don’t agree on common concepts and risk assessments

Nuisance species: beyond the ecological perspective

Comparison of reproductive traits between two salt-marsh wolf spiders (Araneae, Lycosidae) under different habitat suitability conditions

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