Variation in Herbivore-Mediated Indirect Effects of an Invasive Plant on a Native Plant

Russell, Francis; Louda, Svaťa M.; Rand, Tatyana A.; Kachman, Stephen D.

doi:10.1890/0012-9658(2007)88[413:vihieo]2.0.co;2

Cited by 26 publications

(30 citation statements)

References 36 publications

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“…Both these fields face the challenge of predicting potential impacts of introduced species or control agents before their arrival or release3031. Our results show that apparent competition is an important structuring force within host–parasitoid assemblages, and that predictive models could be improved by including apparent competitive effects.…”

Section: Discussionmentioning

confidence: 83%

Apparent competition drives community-wide parasitism rates and changes in host abundance across ecosystem boundaries

et al. 2016

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Species have strong indirect effects on others, and predicting these effects is a central challenge in ecology. Prey species sharing an enemy (predator or parasitoid) can be linked by apparent competition, but it is unknown whether this process is strong enough to be a community-wide structuring mechanism that could be used to predict future states of diverse food webs. Whether species abundances are spatially coupled by enemy movement across different habitats is also untested. Here, using a field experiment, we show that predicted apparent competitive effects between species, mediated via shared parasitoids, can significantly explain future parasitism rates and herbivore abundances. These predictions are successful even across edges between natural and managed forests, following experimental reduction of herbivore densities by aerial spraying of insecticide over 20 hectares. This result shows that trophic indirect effects propagate across networks and habitats in important, predictable ways, with implications for landscape planning, invasion biology and biological control.

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Section: Discussionmentioning

confidence: 83%

Apparent competition drives community-wide parasitism rates and changes in host abundance across ecosystem boundaries

et al. 2016

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“…We expected the new native host plant to receive primarily "spillover" feeding from high populations of T. horridus on individuals near exotic host plants, as reported in other cases of nontarget feeding (Blossey et al 2001, Russell et al 2007 …”

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confidence: 92%

Occurrence ofTrichosirocalus horridus(Coleoptera: Curculionidae) on NativeCirsium altissimumVersus ExoticC. vulgarein North American Tallgrass Prairie

et al. 2009

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Postrelease studies can provide data with which to evaluate expectations based on prerelease tests of biological control insects. In 2004, we observed Trichosirocalus horridus Panzer (Coleoptera: Curculionidae), the rosette weevil introduced into North America against Eurasian thistles, feeding on native tall thistle, Cirsium altissimum L. Spreng., in tallgrass prairie. In this study, we examined the rosette weevil's use of tall thistle, compared with its use of the co-occurring exotic bull thistle, C. vulgare (Savi) Tenore. For both thistle species, we quantified weevil frequency, abundance, and seasonal variation in incidence, using both timed observations at two sites over two growing seasons (2004, 2005) and dissections of thistle flowering shoots from 13 sites (2005). Based on prerelease information, we expected the Eurasian thistle to be the quantitatively preferred host plant for this Eurasian weevil. Instead, we found that both the frequency of infestation and the mean number of adult rosette weevils per plant were at least as high, and sometimes higher, on the native thistle as on the exotic thistle. Furthermore, adult weevil phenology coincided on the two host species. This study provides new quantitative evidence of nontarget feeding by another weevil released for thistle biological control; and it raises important questions for further research. We conclude that continued new releases, as well as augmentation of existing populations, of T. horridus should wait until more research is done on the impact of the nontarget occurrence now reported for this biological control insect.

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“…Over time isolated populations of many native North American thistles became infested (Turner et al, 1987;Strong, 1997;Louda et al, 1997Louda et al, , 1998Sauer and Bradley, 2008), although, for many species, use was at minor levels not expected to reduce populations (Herr, 2000). Some species, however, suffered density reductions owing to loss of seeds to R. conicus feeding (Russell and Louda, 2004;Russell et al, 2007;DePrenger-Levin et al, 2010). 3 Polyphagous tachinid, Compsilura concinnata, in Massachusetts in 1905. To combat the forest defoliator gypsy moth, Lymantria dispar (L.) (Lepidoptera: Erebidae, Lymantriinae) in Massachusetts, many par asitoids and predators were introduced in the early 1900s (Fuester et al, 2014).…”

Section: Cases Of Unsafe Biological Control Introductionsmentioning

confidence: 99%

Benefit–risk assessment of biological control in wildlands

Driesche¹,

Simberloff

2016

Integrating Biological Control Into Conservation Practice

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Variation in Herbivore-Mediated Indirect Effects of an Invasive Plant on a Native Plant

Cited by 26 publications

References 36 publications

Apparent competition drives community-wide parasitism rates and changes in host abundance across ecosystem boundaries

Apparent competition drives community-wide parasitism rates and changes in host abundance across ecosystem boundaries

Occurrence ofTrichosirocalus horridus(Coleoptera: Curculionidae) on NativeCirsium altissimumVersus ExoticC. vulgarein North American Tallgrass Prairie

Benefit–risk assessment of biological control in wildlands

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