Effects of herbivory and competition on an introduced plant in decline

Erneberg, Marianne

doi:10.1007/s004420050719

Cited by 32 publications

(27 citation statements)

References 13 publications

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“…A common view in invasion ecology is that communities with higher species richness are more resistant to the establishment and spread of invasive species (the diversityinvasibility relationship, Elton 1958). This idea received support (Case 1990;Erneberg 1999;Kennedy et al 2002) mainly from plant ecologists (Levine et al 2004), while much less is known about ecosystem resistance to invasive pest insects (Wilsey and Polley 2002). A few recent studies suggest that tree diversity in native communities may reduce the establishment and spread of invasive pests (Rigot et al 2014;Guyot et al 2015), but identifying the underlying mechanisms remains a major challenge (Nunez-Mir et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Plant neighbour identity and invasive pathogen infection affect associational resistance to an invasive gall wasp

et al. 2017

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Theory predicts that mixed forests are more resistant to native pests than pure forests (i.e. associational resistance) because of reduced host accessibility and increased top-down control by natural enemies. Yet, whether the same mechanisms also apply to invasive pests remains to be verified. We tested the hypothesis of associational resistance against the invasive Asian chestnut gall wasp (ACGW, Dryocosmus kuriphilus) by comparing ACGW infestation rates on chestnuts (Castanea sativa) in stands varying in species composition (chestnut alone or associated with oaks, pines or ashes). We investigated the effects of reduced chestnut density and frequency in mixed stands, as well as the effect of biotic interactions between ACGW, its parasitoids and the chestnut blight disease (caused by Cryphonectria parasitica). ACGW infestation rates were significantly lower in chestnut-oak and chestnut-ash mixtures than in pure chestnut stands and chestnut-pine mixtures. Infestation rate decreased with decreasing chestnut relative proportion. The composition of native parasitoid communities emerged from galls significantly differed between pure and mixed chestnut stands, but not the species richness or abundance of parasitoids. The abundance of the introduced parasitoid Torymus sinensis was not correlated with ACGW infestation rates and was independent of stand composition. Blight symptoms modified ACGW infestation rates with taller trees being preferred when they were asymptomatic but avoided when they presented blight disease damage. Our results suggest that conservation biological control based on tree species mixtures could contribute to reducing the damage of invasive forest pests.Excepting for the first and last authors, the order of authors is alphabetical.

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Section: Introductionmentioning

confidence: 99%

Plant neighbour identity and invasive pathogen infection affect associational resistance to an invasive gall wasp

et al. 2017

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“…Reallocation of resources to growth or reproduction after herbivory can be advantageous for species colonizing new areas (Blundell & Peart, 2001;Erneberg, 1999;Rogers & Siemann, 2004;Sun et al, 2009). However, establishing the connection between response to herbivory and invasive potential is extremely difficult.…”

Section: Resultsmentioning

confidence: 99%

Variability in Compensatory Ability and Relative Invasive Potential in Ornamental Cleomes

Raboteaux¹,

Anderson²

2014

IJB

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Tolerance to herbivory is an important trait influencing invasive potential of exotic plant species. However, though many invasive plant species have been introduced as ornamentals, tolerance to herbivory has not been evaluated among cultivars of ornamental crops to assess relative invasive potential. A greenhouse study was performed to compare tolerance to simulated herbivory in five Cleome cultivars (Sparkler White, Sparkler Rose, Queen White, Queen Rose and Solo). The herbivory treatments simulated deer, rabbit and invertebrate herbivore damage by clipping the main stem, removing leaves, or punching out leaf pieces, respectively. Data were collected for flowering time, vegetative and reproductive biomass, ratio of reproductive: vegetative biomass (reproductive effort), number of flowering and vegetative shoots, ratio of number of flowering: total shoots (reproductive allocation), and number of ovules/flower. Cultivars showed different norms of tolerance ranging from under compensation to overcompensation with differences among cultivars within series. The response differed among patterns of simulated herbivory with stem clipping having the most dramatic and negative effect on plant growth and reproduction relative to whole leaf and partial leaf defoliation. The response also varied depending on cultivar and trait. For example, compensation in vegetative, but not reproductive, biomass, was observed across most cultivars after clipping. Significant interactions of herbivory treatment x cultivar were detected for total shoot number and the ratio of flowering: total shoots in the stem clipping experiment, indicating shifts in relative cultivar ranks. The implication of variation in tolerance to herbivory is discussed in relation to ornamental crop development and invasive species risk assessment.

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“…Our finding that effects of aboveground parts of neighbor plants and insect folivory acted independently in reducing growth of tall thistle rosettes adds to a short but growing list of field experiments in natural or agroecosystems that demonstrate that independent effects of neighbor plants and insect folivory on host plant growth may be more common than either synergistic or antagonistic interactions (independent effects on growth: Rees and Brown 1992, McEvoy et al 1993, Erneberg 1999, Newingham and Callaway 2006; synergistic effects on growth: Nötzold et al 1998, Agrawal 2004; antagonistic effects on growth: Haag et al 2004). In spite of the independence of their effects on plant growth, we did find evidence that the presence of neighbor plants magnified the impact of insect folivory on the transition rate of rosettes to reproductive life-stages.…”

Section: Combined Effects Of Neighbor Plants and Insect Folivorymentioning

confidence: 99%

Combined effects of folivory and neighbor plants on Cirsium altissimum (tall thistle) rosette performance

Russell

Spencer

2009

Plant Ecol

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Predicting how herbivory and neighbor plant interactions combine to affect host plants is critical to explaining variation in herbivores' impact on plant population dynamics. In a field experiment, we asked whether the combined effects of neighbor plants and folivores upon performance of tall thistle (Cirsium altissimum), a monocarpic perennial, can be predicted as the product of their individual effects (i.e. effects of neighbor plants and folivores act independently in suppressing tall thistle performance). Alternately, the combined effects of neighbor plants and folivores might be greater, indicating a synergistic interaction, or less, indicating an antagonistic interaction, than the product of their individual effects. Our experiment involved a neighbor plant clipping treatment and a folivory reduction treatment in a factorial design with manipulations applied to naturally-occurring tall thistle rosettes in restored tallgrass prairie.

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Effects of herbivory and competition on an introduced plant in decline

Cited by 32 publications

References 13 publications

Plant neighbour identity and invasive pathogen infection affect associational resistance to an invasive gall wasp

Plant neighbour identity and invasive pathogen infection affect associational resistance to an invasive gall wasp

Variability in Compensatory Ability and Relative Invasive Potential in Ornamental Cleomes

Combined effects of folivory and neighbor plants on Cirsium altissimum (tall thistle) rosette performance

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