Seasonal life-history models for the integrated management of the invasive weed nodding thistle Carduus nutans in Australia

Katriona Shea, Andy Sheppard, Tim Woodburn

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

1. It is widely accepted that combining several control options into integrated pest management strategies is the most effective way to provide long-term suppression of pest populations. However, full factorial field trials of all single and integrated control options for a pest species would be prohibitively expensive and time consuming. Methods to allow triage of the huge array of management options would be of great value in streamlining the decision-making process. 2. We present a seasonally structured, individual-based model, specifically designed to compare and rank detailed management strategies for a noxious pasture weed. The model structure is determined in part by the demographic data available, and in part by the management options under consideration. The case study is for nodding thistle Carduus nutans in Australia. Eight years of demographic data, for more than 8000 mapped plants, were used to parameterize the model, which is age-, size- and density-dependent and incorporates individual variation. Management options for this plant include three biocontrol agents, as well as conventional herbicide and grazing management strategies, which can be used alone or in a variety of combinations. Data on management impacts were drawn from multiple studies. 3. The model predicts that the root-crown weevil Trichosirocalus mortadelo will more effectively suppress weed populations than either of the two flowerhead-feeding insect agents Urophora solstitialis and Rhinocyllus conicus. Crash grazing (up to four times the regular grazing pressure) in any single season, or when most effectively applied across spring and summer, is less effective than T. mortadelo, while combinations of crash grazing and biocontrol agents strongly decrease weed population persistence. However, lethal herbicide is the best single strategy, while spring spray-grazing (a combination of non-lethal herbicide and grazing) is the best integrated weed management strategy. 4. Synthesis and applications. The model is structured by, and serves to integrate, available information on demography and management from multiple sources. The subset of strategies that performed well forms the focus for fewer, more thorough, field trials. The decision-making approach illustrated here is also applicable to any species and any array of management options.

Original languageEnglish (US)
Pages (from-to)517-526
Number of pages10
JournalJournal of Applied Ecology
Volume43
Issue number3
DOIs
StatePublished - Jun 1 2006

Fingerprint

weed
life history
grazing
herbicide
biocontrol agent
decision making
grazing management
pest species
individual-based model
integrated pest management
integrated management
grazing pressure
individual variation
demography
spray
pasture
persistence
insect
summer

All Science Journal Classification (ASJC) codes

  • Ecology

Cite this

@article{453c853e349243b5b5d84c74161edf32,
title = "Seasonal life-history models for the integrated management of the invasive weed nodding thistle Carduus nutans in Australia",
abstract = "1. It is widely accepted that combining several control options into integrated pest management strategies is the most effective way to provide long-term suppression of pest populations. However, full factorial field trials of all single and integrated control options for a pest species would be prohibitively expensive and time consuming. Methods to allow triage of the huge array of management options would be of great value in streamlining the decision-making process. 2. We present a seasonally structured, individual-based model, specifically designed to compare and rank detailed management strategies for a noxious pasture weed. The model structure is determined in part by the demographic data available, and in part by the management options under consideration. The case study is for nodding thistle Carduus nutans in Australia. Eight years of demographic data, for more than 8000 mapped plants, were used to parameterize the model, which is age-, size- and density-dependent and incorporates individual variation. Management options for this plant include three biocontrol agents, as well as conventional herbicide and grazing management strategies, which can be used alone or in a variety of combinations. Data on management impacts were drawn from multiple studies. 3. The model predicts that the root-crown weevil Trichosirocalus mortadelo will more effectively suppress weed populations than either of the two flowerhead-feeding insect agents Urophora solstitialis and Rhinocyllus conicus. Crash grazing (up to four times the regular grazing pressure) in any single season, or when most effectively applied across spring and summer, is less effective than T. mortadelo, while combinations of crash grazing and biocontrol agents strongly decrease weed population persistence. However, lethal herbicide is the best single strategy, while spring spray-grazing (a combination of non-lethal herbicide and grazing) is the best integrated weed management strategy. 4. Synthesis and applications. The model is structured by, and serves to integrate, available information on demography and management from multiple sources. The subset of strategies that performed well forms the focus for fewer, more thorough, field trials. The decision-making approach illustrated here is also applicable to any species and any array of management options.",
author = "Katriona Shea and Andy Sheppard and Tim Woodburn",
year = "2006",
month = "6",
day = "1",
doi = "10.1111/j.1365-2664.2006.01160.x",
language = "English (US)",
volume = "43",
pages = "517--526",
journal = "Journal of Applied Ecology",
issn = "0021-8901",
publisher = "Wiley-Blackwell",
number = "3",

}

Seasonal life-history models for the integrated management of the invasive weed nodding thistle Carduus nutans in Australia. / Shea, Katriona; Sheppard, Andy; Woodburn, Tim.

In: Journal of Applied Ecology, Vol. 43, No. 3, 01.06.2006, p. 517-526.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Seasonal life-history models for the integrated management of the invasive weed nodding thistle Carduus nutans in Australia

AU - Shea, Katriona

AU - Sheppard, Andy

AU - Woodburn, Tim

PY - 2006/6/1

Y1 - 2006/6/1

N2 - 1. It is widely accepted that combining several control options into integrated pest management strategies is the most effective way to provide long-term suppression of pest populations. However, full factorial field trials of all single and integrated control options for a pest species would be prohibitively expensive and time consuming. Methods to allow triage of the huge array of management options would be of great value in streamlining the decision-making process. 2. We present a seasonally structured, individual-based model, specifically designed to compare and rank detailed management strategies for a noxious pasture weed. The model structure is determined in part by the demographic data available, and in part by the management options under consideration. The case study is for nodding thistle Carduus nutans in Australia. Eight years of demographic data, for more than 8000 mapped plants, were used to parameterize the model, which is age-, size- and density-dependent and incorporates individual variation. Management options for this plant include three biocontrol agents, as well as conventional herbicide and grazing management strategies, which can be used alone or in a variety of combinations. Data on management impacts were drawn from multiple studies. 3. The model predicts that the root-crown weevil Trichosirocalus mortadelo will more effectively suppress weed populations than either of the two flowerhead-feeding insect agents Urophora solstitialis and Rhinocyllus conicus. Crash grazing (up to four times the regular grazing pressure) in any single season, or when most effectively applied across spring and summer, is less effective than T. mortadelo, while combinations of crash grazing and biocontrol agents strongly decrease weed population persistence. However, lethal herbicide is the best single strategy, while spring spray-grazing (a combination of non-lethal herbicide and grazing) is the best integrated weed management strategy. 4. Synthesis and applications. The model is structured by, and serves to integrate, available information on demography and management from multiple sources. The subset of strategies that performed well forms the focus for fewer, more thorough, field trials. The decision-making approach illustrated here is also applicable to any species and any array of management options.

AB - 1. It is widely accepted that combining several control options into integrated pest management strategies is the most effective way to provide long-term suppression of pest populations. However, full factorial field trials of all single and integrated control options for a pest species would be prohibitively expensive and time consuming. Methods to allow triage of the huge array of management options would be of great value in streamlining the decision-making process. 2. We present a seasonally structured, individual-based model, specifically designed to compare and rank detailed management strategies for a noxious pasture weed. The model structure is determined in part by the demographic data available, and in part by the management options under consideration. The case study is for nodding thistle Carduus nutans in Australia. Eight years of demographic data, for more than 8000 mapped plants, were used to parameterize the model, which is age-, size- and density-dependent and incorporates individual variation. Management options for this plant include three biocontrol agents, as well as conventional herbicide and grazing management strategies, which can be used alone or in a variety of combinations. Data on management impacts were drawn from multiple studies. 3. The model predicts that the root-crown weevil Trichosirocalus mortadelo will more effectively suppress weed populations than either of the two flowerhead-feeding insect agents Urophora solstitialis and Rhinocyllus conicus. Crash grazing (up to four times the regular grazing pressure) in any single season, or when most effectively applied across spring and summer, is less effective than T. mortadelo, while combinations of crash grazing and biocontrol agents strongly decrease weed population persistence. However, lethal herbicide is the best single strategy, while spring spray-grazing (a combination of non-lethal herbicide and grazing) is the best integrated weed management strategy. 4. Synthesis and applications. The model is structured by, and serves to integrate, available information on demography and management from multiple sources. The subset of strategies that performed well forms the focus for fewer, more thorough, field trials. The decision-making approach illustrated here is also applicable to any species and any array of management options.

UR - http://www.scopus.com/inward/record.url?scp=33646550174&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33646550174&partnerID=8YFLogxK

U2 - 10.1111/j.1365-2664.2006.01160.x

DO - 10.1111/j.1365-2664.2006.01160.x

M3 - Article

VL - 43

SP - 517

EP - 526

JO - Journal of Applied Ecology

JF - Journal of Applied Ecology

SN - 0021-8901

IS - 3

ER -