Environmental issues

Pests and weeds

Workshops to determine the environmental assets at risk from lantana

In accordance with stage two of the Weed Impacts to Native Species (WINS) assessment process, workshops have been held in NSW and Queensland to determine the environmental assets at risk from lantana invasions. Participants at these workshops included bush regenerators, landholders, council pest and environmental officers, threatened species and biodiversity officers, volunteers, Queensland Parks and Wildlife and NSW Department of Environment, Climate Change and Water staff, botanists and ecologists.

During the workshops, participants were asked to identify and justify why they thought a particular species (plant or animal) or ecological community was affected by lantana, using the codes below.

After a round table discussion, a code was assigned for each species identified as being at risk. The codes have been modified from those presented in the WINS system to include biodiversity that may benefit from the presence of lantana (e.g. native birds utilising lantana where there is no longer a native shrub layer present). Information on species that benefit from lantana is critical so that they are not adversely affected during lantana control programs. 

NegativeNPThe native species is not present in infested areas of that species' typical vegetation community or range. This can be determined by comparing infested and uninfested sites, as well as anecdotal or observational data about declines following invasion.
DThere is clear evidence that lantana displaces the native species. For example, the native species occurs at lower than 'normal' densities in invaded sites, but are not totally outcompeted or excluded.
OCSLantana suppresses the native species by reducing individual's vigour or reproductive output.
RPRecruitment is prevented - the adult population is at 'normal' or 'near-normal' density, but few or no juveniles are present.
CARThe native species is considered at risk, but more information is needed to determine the level of risk.
PositiveAH+There is clear evidence that the weed provides an additional habitat for the native species. For example, the native species occurs at higher than 'normal' densities in invaded sites.
P+The weed promotes the native species by increasing individuals' vigour or reproductive output through such things as increased resources, providing food for animals or changes to soil characteristics.
NeutralNAnimals have switched to utilising the weed as a result of native vegetation being replaced by lantana, but there has been no change in their overall density or condition.

Twenty workshops were held across NSW and Queensland and in part resulted in the list of environmental assets at risk from lantana.

Page last updated: 26 February 2011