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Table 3 Data we plan to extract from studies and indication of which data will be used in study validity assessment

From: Management of UK priority invasive alien plants: a systematic review protocol

Variable

Description

Used in study validity assessment

Country

Country/countries where study was carried out

No

Latitude

Latitude of site(s) used in study

No

Longitude

Longitude of site(s) used in study

No

Start date

Date on which management intervention was first implemented (If only month is specified the date will only record the month and year)

No

End date

Date on which implementation of management intervention ceased/was carried out for the final time (If only month is specified the date will only record the month and year)

No

Invasive plant species

Accepted Latin binomial name for focal invasive species

No

Ecosystem type

Ecosystem type in which study was undertaken - following the IUCN habitat classification scheme (https://www.iucnredlist.org/resources/habitat-classification-scheme)

No

Management intervention

Name of management intervention - based on management intervention classification scheme (see Additional file 2 for more details of this)

No

Frequency of management intervention

Number of times year−1 that a management intervention was carried out

No

Intensity of management intervention

The intensity at which a management intervention was carried out (e.g. Grazed with 4 sheep ha−1 year−1)

No

Area over which intervention was applied

Area in ha over which a management intervention was applied

No

Controlled/not controlled

A study which compares outcomes in a location where a management intervention has been used with an area where no management intervention was used

Yes

Before-and-after

A study which compares outcomes between a time when no management intervention was used and a time when the management intervention was used at a later time point

Yes

Experimental/correlative study

Is the study experimental or correlative? (see text for definition of these terms).

Yes

Randomization

Randomized/not randomized

Yes

Pairing

Paired/unpaired (for correlative studies)

Yes

Blocking

Blocked/unblocked (for manipulative studies)

Yes

Size of sampling unit

Size in m2 of sampling unit (e.g. plot) used to collect data

No

Homogeneity of plot sizes used

Homogenous/not homogenous

Yes

Number of replicates

Number of replicate sample units in each comparative group

No

Distance between replicate plots

Distance in km between different plots used to investigate the same treatment

No

Distance between treatments

Distance in km between plots used to investigate different treatments

No

Greenhouse/field study

Was the study carried out in a greenhouse or in the field?

No

Duration of study

Number of years after management intervention for which results were monitored

No

Confounding factors

Were there any severely confounding factors? (yes, partially, no, unclear)

Yes

Outcomes

For a full list of outcomes that we will consider see our outcome classification scheme in Additional file 3

 
  1. In cases where there is not enough information in articles to extract information for a variable this will be left blank