10.5061/DRYAD.1NN35
Burge, Olivia R.
National Institute of Water and Atmospheric Research
Bodmin, Kerry A.
National Institute of Water and Atmospheric Research
Clarkson, Beverley R.
Landcare Research
Bartlam, Scott
Landcare Research
Watts, Corinne H.
Landcare Research
Tanner, Chris C.
National Institute of Water and Atmospheric Research
Data from: Glyphosate redirects wetland vegetation trajectory following
willow invasion
Dryad
dataset
2018
Ramsar
Wetland restoration
Salix cinerea
Glyphosate
Holocene
2018-03-23T00:00:00Z
2018-03-23T00:00:00Z
en
https://doi.org/10.1111/avsc.12320
850582 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Aims: Aerially applied glyphosate is an economic tool to deal with large
areas of invasive plants. However, there are few studies investigating
non-target effects or rates of reinvasion, particularly over multi-year
timeframes. The aims were to evaluate the effectiveness of aerial
application of glyphosate for control of dense stands of the invasive grey
willow Salix cinerea, and determine the vegetation trajectory over the
subsequent two years. Location: Whangamarino Wetland, Waikato, New
Zealand. Methods: A before-after control-impact (BACI) experiment was
conducted in a Ramsar-listed wetland in New Zealand. Effects on S. cinerea
cover, canopy light interception and non-target damage were monitored over
a 7.1 ha experimental area prior to, and for two years following, aerial
application of glyphosate. Vegetation classification, ordination, and
species richness analyses were undertaken to describe community-level
effects. Results: Aerial application of glyphosate to an established
willow canopy was effective in reducing cover to < 5% on average
for up to two years post-spray when assessed using 100 m2 vegetation
survey plots. Smaller 1 m2 plots were more sensitive for detecting willow
reinvasion, which was noted from one year post-spray. Collateral damage to
non-target sub-canopy species was generally minimal, except for the native
tree-fern Dicksonia squarrosa which showed marked reductions in cover and
no recovery over the study period. Species richness was higher in sprayed
plots post-spray and a shift towards a native Carex-dominated sedgeland
community was detected. Conclusions: Aerial application of glyphosate to a
dense canopy of mature willow was effective in reducing the cover and
dominance of this invasive wetland tree species. Minimal collateral damage
occurred, facilitating recovery and expansion of a native sedgeland
community. The risk of secondary invasion did not eventuate, although
exotic species richness spiked in the year following spraying. Sedgelands
are susceptible to willow reinvasion via seed so longer-term trajectories
will diverge depending on management intensity. Using currently available
tools the rehabilitation options are either repeated cycles of herbicide
application to redirect the trajectory from reinvasion back to
short-statured sedgelands, or intensive initial management to establish an
alternative, more resilient trajectory to native wetland forest.
Glyphosate redirects wetland vegetation trajectory following willow
invasionVegetation data collected to describe the effect of glyphosate in
a Salix cinerea invaded wetland. See the README file in the zip folder for
further detailsglyphosate_package_dryad.zip
New Zealand
Whangamarino wetland
Waikato