Managing the impact of invasive species: the value of knowing the density–impact curve

Yokomizo, Hiroyuki; Possingham, Hugh P.; Thomas, Matthew B.; Buckley, Yvonne M.

doi:10.1890/08-0442.1

Cited by 185 publications

(219 citation statements)

References 35 publications

(32 reference statements)

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“…managing for a level of invader cover that is least costly to maintain) since economic and biodiversity objectives are essentially concordant. In relation to invasive species population density and economic impact, Yokomizo et al (2009) have argued that the optimal management effort will minimise the sum of both management and impact Goodall and Naudé (1998). Maintenance control, as defined by the authors, is that undertaken at 0-5% infestation cover.…”

Section: Management Strategy Options-eradication Extirpation and Maimentioning

confidence: 99%

Managing for biodiversity: impact and action thresholds for invasive plants in natural ecosystems

Panetta¹,

Gooden²

2017

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Some studies examining the impacts of invasive plant species in native plant communities have demonstrated non-linear damage functions, whereby community components, such as species richness, are seemingly unaffected by the presence of an invader until it has attained relatively high levels of abundance, whereupon there is a marked decrease with further increases in abundance. Given chronic limitations in the resources available for managing invasive species, it has been argued that the most damaging invaders would be controlled most efficiently by maintaining their abundances below such threshold levels. Because many impact studies do not involve sampling over a wide range of invader abundances it is not possible to estimate the prevalence of threshold relationships. Furthermore, studies that have employed appropriate sampling methods have shown that different life forms exhibit different threshold responses, indicating that maintenance management for biodiversity values should be designed to protect the most sensitive species or groups of species. Since control costs increase with invader abundance, economic and ecological considerations are aligned when invaders are sustainably maintained at relatively low abundances. Adopting such an approach should also minimise negative impacts where damage functions are linear.

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Section: Management Strategy Options-eradication Extirpation and Maimentioning

confidence: 99%

Managing for biodiversity: impact and action thresholds for invasive plants in natural ecosystems

Panetta¹,

Gooden²

2017

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“…Of the principal determinants of IAS impact (i.e., per capita effect, abundance, and range size; Parker et al 1999, Yokomizo et al 2009, Thomsen et al 2011, per capita effect has heretofore been much more difficult to assess and has largely been quantified using correlations such as native abundances pre-and post-invasion (Parker et al 1999). Our meta-analysis considers consumptive impacts of IAS influenced by both their per capita effects and abundances, as measured from correlative, per capita, and per biomass studies.…”

Section: Temperature As a Mediator Of Impactmentioning

confidence: 99%

“…While FR provides an efficient tool for relative predictions of per capita effect, a more complete measurement of impact would include the abundance of the IAS (Parker et al 1999, Yokomizo et al 2009, Thomsen et al 2011. A meta-analysis on inland water and marine systems revealed that higher abundances of IAS lead to increased ecological impacts across taxonomic groups and feeding strategies (Thomsen et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Ecological impacts of invasive alien species along temperature gradients: testing the role of environmental matching

Iacarella

Dick

Alexander

et al. 2015

Ecological Applications

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General rights Copyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights. Abstract. Invasive alien species (IAS) can cause substantive ecological impacts, and the role of temperature in mediating these impacts may become increasingly significant in a changing climate. Habitat conditions and physiological optima offer predictive information for IAS impacts in novel environments. Here, using meta-analysis and laboratory experiments, we tested the hypothesis that the impacts of IAS in the field are inversely correlated with the difference in their ambient and optimal temperatures. A meta-analysis of 29 studies of consumptive impacts of IAS in inland waters revealed that the impacts of fishes and crustaceans are higher at temperatures that more closely match their thermal growth optima. In particular, the maximum impact potential was constrained by increased differences between ambient and optimal temperatures, as indicated by the steeper slope of a quantile regression on the upper 25th percentile of impact data compared to that of a weighted linear regression on all data with measured variances. We complemented this study with an experimental analysis of the functional response (the relationship between predation rate and prey supply) of two invasive predators (freshwater mysid shrimp, Hemimysis anomala and Mysis diluviana) across relevant temperature gradients; both of these species have previously been found to exert strong community-level impacts that are corroborated by their functional responses to different prey items. The functional response experiments showed that maximum feeding rates of H. anomala and M. diluviana have distinct peaks near their respective thermal optima. Although variation in impacts may be caused by numerous abiotic or biotic habitat characteristics, both our analyses point to temperature as a key mediator of IAS impact levels in inland waters and suggest that IAS management should prioritize habitats in the invaded range that more closely match the thermal optima of targeted invaders.

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“…For instance, invasive plant growth has been found to be more suppressed by negative soil feedbacks with time since invasion (Diez et al 2010). Abundance of the invader will also change over time, though the relationship between invader abundance and impact may increase (Thomsen et al 2011) or decrease linearly (Kornis et al 2014), or have a non-linear relationship, depending on the response being measured (Yokomizo et al 2009, Jackson et al 2015. Changes in impacts over time are not well understood as most impact studies are conducted for less than a year, and 40% of studies do not report the time since invasion of their study organism (Strayer et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Negative competitive effects of invasive plants change with time since invasion

2015

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Citation: Iacarella, J. C., P. S. Mankiewicz, and A. Ricciardi. 2015. Negative competitive effects of invasive plants change with time since invasion. Ecosphere 6(7):123. http://dx.doi.org/10.1890/ES15-00147.1Abstract. Competitive impacts of invasive species may vary across invaded ranges, owing to spatiotemporal gradients in adapted traits and abundance levels. Higher levels of interspecific competition in recently invaded areas may lead invaders to be more competitive. Here, using meta-analysis and home range estimation techniques, we examine how negative competitive effects of invasive species vary across different spatio-temporal invasion contexts. We conducted a meta-analysis of 26 studies that used greenhouse microcosm and common garden pairwise experiments to measure the growth response of native plants in the presence of terrestrial plant invaders (totaling 36 species), and compared this to the time since invasion at the collection site (number of years between the estimated year of initial invasion, by spread of the invader, and the time of collection for the study). We show that negative competitive effects decline across sites that had been invaded for longer periods of time, with effects of invasive grasses declining more rapidly over time than forbs, herbs and shrubs. To our knowledge, only two studies have directly measured competitive or consumptive effects of invaders across a gradient of time since invasion; our study is the first to identify a general pattern of temporal variation of competitive effects that may be attributed to intraspecific trait differences. Management efforts may be guided by such spatio-temporal patterns of invader impact, particularly for grasses.

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Managing the impact of invasive species: the value of knowing the density–impact curve

Cited by 185 publications

References 35 publications

Managing for biodiversity: impact and action thresholds for invasive plants in natural ecosystems

Managing for biodiversity: impact and action thresholds for invasive plants in natural ecosystems

Ecological impacts of invasive alien species along temperature gradients: testing the role of environmental matching

Negative competitive effects of invasive plants change with time since invasion

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