Plan to Protect Environmental Assets from Lantana - Weeds Australia

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Plan to Protect Environmental Assets from Lantana 3.2.1 Effective control The ability to achieve effective lantana control at a given location was based on the feasibility of removing lantana at the site while minimising off-target impacts, particularly with respect to protecting the environmental assets at risk. The assessment range included: High: Medium: Low: 3.2.2 Impact site easily accessible, lantana infestations easily controllable, with no adverse impacts to the assets at risk. (i) site access difficult or expensive but lantana infestations easily controllable with no adverse impacts to the environmental assets at risk; or, (ii) site easily accessible but lantana infestations difficult or expensive to control, especially with respect to the environmental assets at risk. site access difficult, lantana infestations difficult or expensive to control, especially with respect to the environmental assets at risk. As the impact of lantana on the environmental assets at risk will vary from site to site, the degree of impact at each site also needed to be considered. Two different criteria were used to account for variation in impacts between native plants and animals. The level of the lantana infestation present at the site, and its proximity to the environmental assets at risk, form the basis for this attribute. At some sites, lantana may pose a threat to the species at risk in the future, so is considered a ‘potential impact’. A potential impact is where lantana currently poses a threat to species, but has no c urrent impacts, although it couldaffect those species in the future (see Downey et al. in press-b for further information on differences between threats and impacts). Native plant species at risk The assessment range for native plant species included: High: Medium: Low: lantana poses a direct impact to the plant species at risk and is growing within/over the species at risk. lantana poses a reduced impact to the species at risk or threatens the native species in that it is within close proximity to lantana (growing next to the species at risk). lantana poses only a low threat to the plant species at risk (lantana is a distance away from the species at risk so that there is no immediate threat, but could still pose a threat in the short-term). Native animal species at risk The assessment range for native animal species included: High: Medium: Low: lantana poses a direct impact to the animal species at risk (displacing animals by restricting their movements); or indirectly through lantana outcompeting native plants that provide a source of food, or by lantana negatively altering the native habitat that these animals utilise. lantana poses a reduced impact to the species at risk or threatens the native species when in close proximity to lantana (growing next to the species at risk), with lantana invading the species' habitat or altering the structure of the habitat. lantana poses only a low threat to the animal species at risk (lantana is a distance away from the species at risk so that there is no immediate threat, but could still pose a threat in the short-term). 15
Plan to Protect Environmental Assets from Lantana 3.2.3 Condition The condition of the environmental assets at risk was determined based on the population health of the individuals at each site. Again, to account for variation between plants and animals at risk, two different criteria were used. Where adult and juveniles do not co-occur within a species, the health of the individuals present was assessed. Native plant species at risk The assessment range for native plant species included: High: Medium: Low: majority of individuals within the population are healthy. There is a mix of age classes (seedlings through to adults). mixture of sick/dying and healthy individuals and/or a poor age structure (few seedlings and mostly adults). majority of individuals sick/unhealthy. There is a limited age structure (no seedlings). Native animal species at risk The assessment range for native animal species included: High: Medium: Low: 3.2.4 Site importance majority of individuals within the population are healthy. There is a mix of age classes (juveniles through to adults). mixture of individuals in poor condition through to healthy individuals. There is a poor age structure (few juveniles). majority of individuals are in poor condition. There is a limited age structure (only adults present with no offspring). The value of the site to the environmental assets’ overall survival was also considered. Factors taken into account included the size of the population (for example, few or many individuals) in relation to its natural occurrence (some species only occur in small populations). To account for climate change, whether the environmental asset occurs at a site at the edge of its range or whether the site is an important corridor for the native animals at risk were also considered. To account for the variation between plants and animals at risk, different criteria were again used. Native plant species at risk The assessment range for native plant species included: High: Medium: Low: the site has one of the largest known populations or is important for the species (for example is an outliner population or an important corridor). smaller or larger populations known elsewhere; important but not critical for the species survival. few individual plants only at the site, with larger populations elsewhere; site not important for the species survival. Native animal species at risk The assessment range for native animal species included: High: Medium: Low: the site has one of the largest known populations or is importantfor the species (for example an important corridor or breeding site). smaller or larger populations known elsewhere; habitat important but not critical for the species survival. few individuals only at the site, with larger populations elsewhere; site not important for the species survival. 16
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Plan to Protect Environmental Assets from Lantana - Weeds Australia

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