Show simple item record Meffin, Ross Duncan, Richard P. Hulme, Philip E.
dc.coverage.spatial Canterbury
dc.coverage.spatial New Zealand 2017-08-11T20:25:51Z 2017-08-11T20:25:51Z 2017-08-11
dc.identifier doi:10.5061/dryad.p48k7
dc.identifier.citation Meffin R, Duncan RP, Hulme PE (2017) Testing weed risk assessment paradigms: intraspecific differences in performance and naturalisation risk outweigh interspecific differences in alien Brassica. Journal of Applied Ecology, online in advance of print.
dc.description 1.Risk assessments of alien species are usually conducted at species level, assuming that all individuals of a given species pose similar risks. However, this may not be the case if there is substantial within-species variation that could influence invasion success. 2.We used a seed addition experiment, comprising 25 taxonomically stratified varieties of three Brassica species introduced to roadside habitats in Canterbury, New Zealand, to quantify variation in performance among species, subspecies and varieties. We aimed to assess if species was the most appropriate taxonomic level at which to evaluate invasion risk. 3.Differences among varieties within species explained approximately 30 times more of the variation in performance (number of individuals/quadrat) than differences among species. Some of the variation among varieties was attributable to differences in seed viability. 4.Nevertheless, differences among taxonomic groups explained only 7% of the total variation in performance; 28% was attributable to differences among plots, reflecting broad-scale environmental variation, while 65% was attributable to differences among quadrats nested within plots, highlighting the importance of fine-scale variation in the availability of suitable microsites. 5.Policy Implications. Our seed addition experiment quantified variation in performance of 25 taxonomically stratified Brassica taxa introduced to roadside habitats. Varieties (nested within species) differed in performance far more than did species. This suggests risk assessments carried out at species level may overlook important subspecific variation in invasion risk. This is particularly true for conventionally bred and genetically modified species, which may contain taxa posing risks different to that at which the species is assessed. Consideration should be given to subjecting unassessed subspecies and varieties of plants to risk assessments similar to those applied to species.
dc.relation.haspart doi:10.5061/dryad.p48k7/1
dc.relation.haspart doi:10.5061/dryad.p48k7/2
dc.relation.haspart doi:10.5061/dryad.p48k7/3
dc.relation.haspart doi:10.5061/dryad.p48k7/4
dc.relation.haspart doi:10.5061/dryad.p48k7/5
dc.relation.haspart doi:10.5061/dryad.p48k7/6
dc.relation.haspart doi:10.5061/dryad.p48k7/7
dc.relation.isreferencedby doi:10.1111/1365-2664.12993
dc.subject biosecurity
dc.subject breeding
dc.subject cultivar
dc.subject exotic
dc.subject GMO
dc.subject horticulture
dc.subject repeatability
dc.subject WRA
dc.title Data from: Testing weed risk assessment paradigms: intraspecific differences in performance and naturalisation risk outweigh interspecific differences in alien Brassica
dc.type Article
dwc.ScientificName Brassica napus
dwc.ScientificName Brassica rapa
dwc.ScientificName Brassica oleracea
dc.contributor.correspondingAuthor Meffin, Ross
prism.publicationName Journal of Applied Ecology

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Title Seed sowing experiment
Downloaded 2 times
Description Data recording counts from seed sowing experiment of 25 Brassica species in Canterbury NZ. Also includes biotic and abiotic covariate data.
Download common garden.xlsx (821.4 Kb)
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Title buried_germ
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Description Seed survival data, after burial for 1 year. Wholed = dead seed, wholea = alive seed
Download buried_germ.xlsx (18.00 Kb)
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Title climate
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Description Climatic data for each plot in the seed sowing experiment. Mean: winter precipitation, summer precipitation, January temp, July temp and annual temperature.
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Title common garden 2
Downloaded 2 times
Description Second seed sowing experiment (2012). Includes 2 x propagule pressure treatments (25 and 250 seeds per 25 x 25 cm plot) and 2 disturbance treatments (u = control, d= all vegetation removed from plot with mattock prior to sowing)
Download common garden 2.xlsx (362.5 Kb)
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Title germination
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Description viability data for seed used in seed sowing experiments
Download germination.xlsx (15.06 Kb)
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Title seed_weight
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Description Seed weight data for seeds used in sowing experiments
Download seed_weight.xlsx (11.28 Kb)
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Title species
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Description Species, subspecies and variety of the 25 taxa used in the seed sowing experiments. Species ID field links to other data sets in this package.
Download species.xlsx (11.82 Kb)
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