Feasibility of classical biological control of<i>Sonchus oleraceus</i>in Australia

Lesieur, Vincent; Jourdan, M.; Thomann, Thierry; Ollivier, Matthias; Tavoillot, Johannes; Morin, L.; Raghu, S.

doi:10.1080/09583157.2021.1936451

Cited by 4 publications

(10 citation statements)

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“…This example shows how the network developed here is complementary to classical procedures, making it possible to narrow down the list of candidate BCA to be tested. The same applies to Cheilosia latifrons Zetterstedt, a species collected in the classical survey (Lesieur et al, 2021). The meta-network indicated it was collected from S. asper and Picris echioides (L.), revealing its oligophagous dietary behaviour.…”

Section: First Criterion: a Restricted Ecological Host Rangementioning

confidence: 84%

“…However, contradictions were observed between the ecological host range described by network analysis and published findings or specificity test results (Lesieur et al, 2021). These discrepancies may be due to insufficient sampling for the recording of species interactions (as shown by accumulation curve on total interactions) or to the presence of cryptic host races or cryptic species that have yet to be deciphered.…”

Section: First Criterion: a Restricted Ecological Host Rangementioning

confidence: 89%

“…To discuss the contribution of the method herein proposed, we used, as a point of reference, a survey performed following classical procedures (sampling, rearing and identification of specimens exclusively collected from S. oleraceus) in the frame of this CBC programme (Lesieur et al, 2021). However, we acknowledge that this classical survey covered a longer period of sampling (2017-2020) and a much larger geographical area was prospected (10 countries through Europe and North Africa).…”

Section: Assessing the Contribution Of The Approach For The Biocontrol Programmementioning

confidence: 99%

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An innovative approach combining metabarcoding and ecological interaction networks for selecting candidate biological control agents

Ollivier

Lesieur

Tavoillot

et al. 2021

Journal of Applied Ecology

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1. Classical biological control (CBC) can be used to decrease the density of invasive species to below an acceptable ecological and economic threshold. Natural enemies specific to the invasive species are selected from its native range and released into the invaded range. This approach has drawbacks, despite the performance of specificity tests to ensure its safety, because the fundamental host range defined under controlled conditions does not represent the actual host range in natura, and these tests omit indirect interactions within community.2. We focus on Sonchus oleraceus (Asteraceae), a weed species originating from Western Palearctic that is invasive in many countries and notably in Australia. We explore how analyses of interaction network within its native range can be used to (a) inventory herbivores associated to the target plant, (b) characterize their ecological host ranges and (c) guide the selection of candidate biocontrol agents considering interactions with species from higher trophic levels. Arthropods were collected from plant community sympatric to S. oleraceus, in three bioclimatic regions, and interactions were inferred by a combination of molecular and morphological approaches.3. The networks reconstructed were structured in several trophic levels from basal species (plant community), to intermediate and top species (herbivorous arthropods and their natural enemies). The sub-network centred on S. oleraceus-related interactions contained 116 taxa and 213 interactions. We identified 47 herbivores feeding on S. oleraceus, 15 of which were specific to the target species. Some discrepancies with respect to published findings or conventional specificity tests suggested possible insufficient sampling effort for the recording of interactions or the existence of cryptic species. Among potential candidate agents, six exhibited interactions with natural enemies.4. Synthesis and applications. Adopting a network approach as prerequisite step of the classical biological control programme can provide a rapid screening of potential agents to be tested in priority. Once ecological host range defined, we suggest that priority should be given to agent used by a minimum species, and, when they

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Section: First Criterion: a Restricted Ecological Host Rangementioning

confidence: 84%

Section: First Criterion: a Restricted Ecological Host Rangementioning

confidence: 89%

Section: Assessing the Contribution Of The Approach For The Biocontrol Programmementioning

confidence: 99%

See 1 more Smart Citation

An innovative approach combining metabarcoding and ecological interaction networks for selecting candidate biological control agents

Ollivier

Lesieur

Tavoillot

et al. 2021

Journal of Applied Ecology

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show abstract

“…The Gaskin et al (2019) strategy of testing different accessions of promising candidate agents for efficacy on a range of representative genotypes of the target weed in the invaded range should be considered for S. oleraceus , provided adequately host‐specific agents for the Australian context (given the diversity of native species in the subtribe Sonchinae) can be found. However, a recent study shows that none of the prioritized candidate agents found in Europe and tested were specific enough to be pursued further for S. oleraceus biological control in Australia (Lesieur et al, 2021). Therefore, a better integration of existing weed management strategies might be needed to mitigate the impacts of this weed.…”

Section: Discussionmentioning

confidence: 99%

“…However, a recent study shows that none of the prioritized candidate agents found in Europe and tested were specific enough to be pursued further for S. oleraceus biological control in Australia (Lesieur et al, 2021). Therefore, a better integration of existing weed management strategies might be needed to mitigate the impacts of this weed.…”

Section: Challenges For Biological Controlmentioning

confidence: 99%

Population genomics reveal multiple introductions and admixture of Sonchus oleraceus in Australia

Encinas‐Viso

Morin

Raghu

et al. 2022

Diversity and Distributions

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Aim The goal of this study was to investigate the invasion history of the weed Sonchus oleraceus in Australia by comparing the population genetic structure of individuals at different locations in Australia, and in the most likely areas of origin in the native range. Location Samples were collected in Europe and Morocco, North Africa (27 locations), and Australia (17 locations). Methods We performed population genetic analyses using a large dataset comprising 2883 single nucleotide polymorphism markers from 547 plant samples and investigated the invasion history of S. oleraceus with Approximate Bayesian Computation and Random Forest classification algorithms. We compared single and multiple invasion scenarios considering admixture having occurred before and after introduction. Results Our results revealed high levels of inbreeding within sampling locations in the two ranges. Analyses also showed that S. oleraceus was possibly introduced to Australia at least twice: a first introduction around 1000 years ago before British settlement and a more recent introduction (~65 years ago) from Europe and North Africa. We also found evidence of post‐introduction admixture and a potential reintroduction of S. oleraceus from Australia back to its native range. Main conclusions We conclude that the invasion history of S. oleraceus into Australia is probably historic (i.e. prior to British settlements) and complex showing recent evidence of post‐introduction admixture. The complex invasion history of S. oleraceus in Australia poses challenges for the search of potential biological control agents.

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Decline of the invasive plant Asparagus asparagoides within the first seven years after release of biological control agents in Australia

et al. 2022

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Feasibility of classical biological control ofSonchus oleraceusin Australia

Cited by 4 publications

References 50 publications

An innovative approach combining metabarcoding and ecological interaction networks for selecting candidate biological control agents

An innovative approach combining metabarcoding and ecological interaction networks for selecting candidate biological control agents

Population genomics reveal multiple introductions and admixture of Sonchus oleraceus in Australia

Decline of the invasive plant Asparagus asparagoides within the first seven years after release of biological control agents in Australia

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