Can an integrated management approach provide a basis for long‐term prevention of weed dominance in Australian pasture systems?

Huwer, R. K.; Briese, D. T.; Dowling, P. M.; Kemp, David; Lonsdale, W. M.; Michalk, D. L.; Neave, M. J.; Sheppard, Andy; Woodburn, T. L.

doi:10.1111/j.1365-3180.2005.00452.x

Cited by 22 publications

(20 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We found that the interactions between floral herbivory and two parameters that can be influenced by local weed management practices (survival to flowering and successful seed germination) predict population stasis across a wide range of parameter values, and probably explain the limited population growth and invasiveness of C. vulgare in Nebraska. This finding is consistent with the suggestion that multiple, interacting factors are generally needed for effective weed control (Shea, Thrall & Burdon 2000;Grigulis et al 2001;Huwer et al 2005).…”

Section: O N C L U S I O Nsupporting

confidence: 91%

See 1 more Smart Citation

Monte Carlo analysis of parameter uncertainty in matrix models for the weed Cirsium vulgare

Tenhumberg

Louda²,

Eckberg³

et al. 2007

Journal of Applied Ecology

View full text Add to dashboard Cite

Summary 1.Parameter uncertainty challenges the use of matrix models because it violates key assumptions underlying elasticity analyses. We have developed a matrix model to compare Monte Carlo methods with elasticity analyses for estimation of the relative importance of factors in the asymptotic population growth rate, λ , of Cirsium vulgare (spear thistle) in Nebraska, USA. 2. We calculated λ for a base model using 11 parameter estimates available for Nebraska populations plus eight extracted from the literature, causing parameter uncertainty. We then calculated λ for 10 000 alternative models using Monte Carlo parameter estimation; parameters were drawn from the full range of each parameter in the literature and partial rank correlation analysis (PRCC) was used to order the parameters by the magnitude of their effect on λ . 3. Monte Carlo analysis found that insect floral herbivory, affecting the regeneration transition, was the most important parameter affecting λ , whereas elasticity analyses suggested that the transition from small to medium size was the most significant. Statistical comparison, using PRCC vs. lower level elasticity (LLE), showed that the Monte Carlo analysis provided a more accurate assessment. 4. As λ > 1 in 99% of the model runs even with significant floral herbivory, we added two parameters influenced by weed management (probability of large thistles dying without producing seed and proportion of seeds that failed to germinate). Simulations that included reductions in these parameters, along with floral herbivory, led to λ < 1 in 17% of the runs, suggesting these three factors interact to produce the low densities observed for this invasive thistle in our study area. 5. Synthesis and applications. This study demonstrates the utility of the Monte Carlo approach for modelling weed dynamics with parameter uncertainty and multiple, potentially interacting, parameters. Invasive population growth by C. vulgare could be limited by a combination of weed management practices and the biotic resistance imposed by native floral herbivores.

show abstract

Section: O N C L U S I O Nsupporting

confidence: 91%

“…This finding is consistent with the suggestion that multiple, interacting factors are generally needed for effective weed control (Shea, Thrall & Burdon 2000; Grigulis et al . 2001; Huwer et al . 2005).…”

Section: Resultsmentioning

confidence: 99%

Monte Carlo analysis of parameter uncertainty in matrix models for the weed Cirsium vulgare

Tenhumberg

Louda²,

Eckberg³

et al. 2007

Journal of Applied Ecology

View full text Add to dashboard Cite

show abstract

“…Fertilisers have been used to increase the palatability of Eragrostis curvula, and in combination with grazing management provided good control (Firn et al 2010). A treatment combination of herbicides and grazing has been effective for the control of Echium plantaginuem (Huwer et al 2005) and Carduus nutans (Shea et al 2006). Herbicides alter the morphology of E. plantaginuem making the rosettes more erect and available to grazing stock (Piggin 1979).…”

Section: Control Strategiesmentioning

confidence: 99%

Using strategically applied grazing to manage invasive alien plants in novel grasslands

2013

View full text Add to dashboard Cite

Introduction: Novel ecosystems that contain new combinations of invasive alien plants (IAPs) present a challenge for managers. Yet, control strategies that focus on the removal of the invasive species and/or restoring historical disturbance regimes often do not provide the best outcome for long-term control of IAPs and the promotion of more desirable plant species. Methods: This study seeks to identify the primary drivers of grassland invasion to then inform management practices toward the restoration of native ecosystems. By revisiting both published and unpublished data from experiments and case studies within mainly an Australian context for native grassland management, we show how alternative states models can help to design control strategies to manage undesirable IAPs by manipulating grazing pressure. Results: Ungulate grazing is generally considered antithetical to invasive species management because in many countries where livestock production is a relatively new disturbance to grasslands (such as in Australia and New Zealand as well as Canada and the USA), selective grazing pressure may have facilitated opportunities for IAPs to establish. We find that grazing stock can be used to manipulate species composition in favour of the desirable components in pastures, but whether grazing is rested or strategically applied depends on the management goal, sizes of populations of the IAP and more desirable species, and climatic and edaphic conditions. Conclusions: Based on our findings, we integrated these relationships to develop a testable framework for managing IAPs with strategic grazing that considers both the current state of the plant community and the desired future state-i.e. the application of the principles behind reclamation, rehabilitation, restoration or all three-over time.

show abstract

“…Integrated management that not only focuses on biocontrol agents but also integrates multiple factors will be more likely to control this invasive weed effectively in the invaded range (Shea, Thrall & Burdon 2000; Grigulis et al . 2001; Huwer et al . 2005; Shea, Sheppard & Woodburn 2006).…”

Section: Discussionmentioning

confidence: 99%

What controls the population dynamics of the invasive thistle Carduus nutans in its native range?

Jongejans

Sheppard²,

Shea

2006

Journal of Applied Ecology

View full text Add to dashboard Cite

Summary 1.The invasive thistle Carduus nutans causes major economic losses in the Americas, Australia and New Zealand. For the first time, we have modelled its population dynamics in its native range, Eurasia, where it rarely reaches problematic densities, in order to identify ways to improve management strategies for this weed in the invaded range. 2. In particular, we investigated whether specialist enemies in the thistle's native range suppress thistle populations, as predicted by the enemy-release hypothesis, and, if so, how this effect relates to other factors that may limit population growth. 3. We constructed population transition matrix models with data from three French populations. A vital rate elasticity analysis revealed that reproduction determines between 33% and 61% of the projected growth rate of the populations, and thus is a key driver of the population dynamics of this monocarpic short-lived perennial. 4. Decreases in population size were predicted by the models for all three populations ( λ < 1). Using limiting factor omission analyses, we showed that the suite of native insect herbivores causing seed losses had a larger impact than the joint effects of rosette damage by sheep and summer drought acting on seedling establishment. Removal of insect herbivores increased the native population growth rate by 166% on average; removal of sheep damage and summer drought from the model increased population growth by 51%. Specialist herbivores and drought interacted synergistically to affect reproduction. Synthesis and applications.We show that vital rate elasticity analysis provides more management information than elasticity analysis on the level of matrix elements, particularly when management options affect only certain vital rates. For example, it can be used to make predictions about the effectiveness of predispersal floral herbivores in control management. The model can also help identify ways in which biocontrol can be augmented using integrated weed management that reduces seedling establishment probabilities, for example by preventing overgrazing. This method illustrates how native range studies of invasive species can be used to generate insights into managing populations in the invaded range.Key-words : biological control, enemy release hypothesis, insect-plant interactions, invaded-native range comparison, matrix projection models, special herbivores, vital rate elasticity

show abstract

Can an integrated management approach provide a basis for long‐term prevention of weed dominance in Australian pasture systems?

Cited by 22 publications

References 20 publications

Monte Carlo analysis of parameter uncertainty in matrix models for the weed Cirsium vulgare

Monte Carlo analysis of parameter uncertainty in matrix models for the weed Cirsium vulgare

Using strategically applied grazing to manage invasive alien plants in novel grasslands

What controls the population dynamics of the invasive thistle Carduus nutans in its native range?

Contact Info

Product

Resources

About