10.5061/DRYAD.P48K7
Meffin, Ross
Lincoln University
Duncan, Richard P.
University of Canberra
Hulme, Philip E.
Lincoln University
Data from: Testing weed risk assessment paradigms: intraspecific
differences in performance and naturalisation risk outweigh interspecific
differences in alien Brassica
Dryad
dataset
2018
biosecurity
Brassica rapa
Brassica oleracea
cultivar
WRA
GMO
Brassica napus
Breeding
2018-07-24T00:00:00Z
2018-07-24T00:00:00Z
en
https://doi.org/10.1111/1365-2664.12993
1254757 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
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.
Seed sowing experimentData recording counts from seed sowing experiment of
25 Brassica species in Canterbury NZ. Also includes biotic and abiotic
covariate data.common garden.xlsxburied_germSeed survival data, after
burial for 1 year. Wholed = dead seed, wholea = alive seedclimateClimatic
data for each plot in the seed sowing experiment. Mean: winter
precipitation, summer precipitation, January temp, July temp and annual
temperature.common garden 2Second 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)germinationviability data for seed used
in seed sowing experimentsseed_weightSeed weight data for seeds used in
sowing experimentsspeciesSpecies, subspecies and variety of the 25 taxa
used in the seed sowing experiments. Species ID field links to other data
sets in this package.
New Zealand
Canterbury