Threat abatement plan for competition and land degradation by rabbits



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Managing the threat


Rabbits are widely established and abundant in Australia and, with any current or foreseeable techniques, are not able to be eradicated. Given the current resources and techniques available, the focus of management is generally on abating their impacts rather than eradication. However, eradication may be achievable in isolated areas such as small reserves, exclosures, and offshore islands.

Sustained control of rabbits is feasible and has been achieved in some large areas using well planned and timely integrated control measures, particularly after rabbits have been reduced by drought or disease (Cooke 1993; Cooke 2012a). Integrated control measures must seek to: use a range of control techniques (e.g. poisoning and warren destruction); target a range of pest species (e.g. rabbit control activities should also focus on the reduction in foxes, feral cats and weeds); and seek to control rabbits across neighbouring land tenures.

In order to effectively manage rabbits and maximise control efforts, control efforts should be:


  • targeted to protect sites where rabbits pose the greatest threat to biodiversity

  • undertaken in a strategic manner to take advantage of the environmental conditions and other complementary activities, and

  • monitored to ensure that objectives are met, and allow management options to be adapted to changing circumstances.

There are a range of control measures available for the management of rabbits. These include poison baiting, biological control agents, warren ripping and fumigation, fencing, harbour removal, and shooting. None of these techniques should be relied upon in isolation.

Research is continuing into improved control measures including biocontrol technology, particularly through three projects run by the Invasive Animals Cooperative Research Centre (Invasive Animals CRC) — the RHD Boost, RHD Accelerator and Bioprospecting projects (Cox et al. 2013). Further information on control measures and the Invasive Animals CRC projects can be found in the supporting Background document (Department of the Environment and Energy 2016a).


Objectives and actions


The goal of this TAP is to minimise the impact of rabbit competition and land degradation on biodiversity in Australia and its territories by:

  • protecting affected threatened species and ecological communities, and

  • preventing further species and ecological communities from becoming threatened.

To achieve this goal, the plan has four main objectives:

  1. Strategically manage rabbits at the landscape scale and suppress rabbit populations to densities below threshold levels in identified priority areas




  1. Improve knowledge and understanding of the impact of rabbits and their interactions with other species and ecological processes




  1. Improve the effectiveness of rabbit control programs, and




  1. Increase engagement of, and awareness by, the community of the environmental impacts of rabbits and the need for integrated control.

Each objective is accompanied by a set of actions, which, when implemented, will help to achieve the goal of the plan. Performance indicators have been established for each objective. Progress will be assessed by determining the extent to which the performance indicators have been met.

The sections below provide background on each objective, followed by a table listing the actions required to meet the objective. Nineteen actions have been developed to meet the four objectives.

Priorities for each action are categorised as ‘very high’, ‘high’ or ‘medium’. Also, each action has been assigned a timeframe within which the outcome could be achieved once the action has commenced. Timeframes are categorised as short term (i.e. within three years), medium term (i.e. within three to five years) or long term (i.e. five years or beyond).

Objective 1 – Strategically manage rabbits at the landscape scale and suppress rabbit populations to densities below threshold levels in identified priority areas


As the eradication of rabbits from all of mainland Australia and Tasmania is not feasible, attention needs to be directed to the management and control of populations to reduce their impact on biodiversity. However, in order to efficiently and effectively manage rabbits, control programs need to be strategically designed and implemented. This includes the consideration of a number of different factors which can influence the success or failure, the effort required, and costs of control programs. The factors may include (among others):

  • identification of threatened species and habitats for which rabbit control activities can provide the most benefit

  • wider, community-based coordination of actions, including on-ground control on private properties, public land and in urban areas to provide control across wider areas to slow re-invasion. Noting that, for the purposes of this threat abatement plan, a greater focus should be on sites of higher conservation value

  • incorporation of economic decision-model analyses to maximise cost-benefit outcomes of control programs

  • identification of other land management activities such as pest animal control and weed management programs for integrated control and to reduce unintended consequences, and

  • environmental site conditions including topography, land type, vegetation and climatic conditions; and their potential influence on control activities.

Control programs also need to take into account the number of rabbits per hectare. Several studies have found that if there are more than 0.5 rabbits per hectare, native species can be severely impacted (Mutze et al. 2008; Bird et al. 2012; Cooke 2012a). For example, when rabbit numbers are greater than 0.5 rabbits per hectare, the recruitment and regeneration of plants are inhibited, causing many of these species to become locally extinct (Mutze et al. 2008; Bird et al. 2012; Cooke 2012a).

The identification and consideration of threatened species and habitats is another critical consideration to ensure the survival of the species in that area. Removal of invasive species such as rabbits has been found to have significant benefits for native species such as reversing local population declines (Mutze et al. 2008; Bird et al. 2012; Pedler et al. 2016). Management actions for invasive species should therefore focus on removing these threats, as well as other threats to the threatened species or ecosystems, to enable the persistence of threatened native species and to support well-functioning ecosystems. Species identified (as at 2016) as being impacted by rabbits are outlined in Appendix A.

In addition to the above factors, prioritisation of control for pest species such as rabbits has been found to be more useful at regional scales e.g. catchment or national resource management levels. Planning at this level enables a more holistic approach to rabbit management across regions, particularly in dividing and allocating resources (Murray et al. 2014). Regional areas are also likely to share the same or similar threatened species and ecological communities.

The actions under this objective therefore seek to assist land managers with information to support strategic rabbit management programs and to focus abatement on priority areas. The actions are envisaged to not only lead to better environmental outcomes such as species and ecological community protection, but to a more efficient and effective use of limited resources.

Key actions for Objective 1 include identifying priority areas for rabbit control on a regional scale, implementing and supporting regional control programs, and promoting and maintaining control programs in areas adjacent to priority areas. In particular, actions will seek to support control of rabbits to threshold levels of less than 0.5 rabbits per hectare.

Action 1.1 seeks to determine regional priority areas for rabbit control by focussing effort on areas where rabbits have the greatest impact on threatened species and/or ecological communities. This includes identifying priority islands for eradication efforts in each state. It also focuses on determining areas where the regeneration capacity of plants and the recovery of threatened species show the greatest potential. This will help obtain the greatest benefit for the amount of effort and resources put in. Aerial surveying using videos and GPS can be a cost-effective method for surveying and mapping regional areas to assist with prioritisation of management activities across a landscape. Economic decision models will also be useful to help determine how these efforts can be prioritised and the best combination of control methods (see background document for further information on economic decision models (Department of the Environment and Energy 2016a)). Control programs need to be implemented or continued in the identified priority areas.

Action 1.2 follows on from action 1.1 by ensuring that control efforts are focused on a wider and more holistic landscape-scale, rather than on small patches of land and including all land tenures such as private land and urban areas. By focusing efforts in this way, control activities can be planned in a strategic manner to take advantage of environmental conditions and other complementary activities in the area.

Action 1.3 relates to action 1.2, by using incentives for land managers to undertake more strategic and landscape-scale approaches to control programs. This should include coordination of control activities across neighbouring properties, including adjacent public and private land. It should be noted that incentives can include non-cash benefits such as training or community facilitation.

Both action 1.3 and 1.2 help to maximise effectiveness and minimise costs by avoiding a piece-meal approach to rabbit control which facilitates immigration from adjoining or adjacent land where no control has been undertaken.

Action 1.4 focuses on assessing the implementation of regional and state and territory based control programs via regular and coordinated monitoring and reporting mechanisms. Monitoring rabbit control programs is critical to assist in determining whether a management program has been successful or not and what the failure points might be. This is particularly important at the regional and state/territory level where funding and effort are put into very similar activities and under similar environmental conditions, but by a range of different groups and individuals. By making program reports readily available, this will help ensure that any future control activities are as effective as possible by allowing management programs to be adapted and avoiding duplication or the implementation of actions that are unlikely to succeed. Where possible, a common and best practice approach to rabbit monitoring should be undertaken to enable comparisons to be made between control activities. Further information on monitoring approaches for rabbits can be found in the background document (Department of the Environment and Energy 2016a).

Action 1.5 focuses on targeted eradication efforts on high priority islands identified through action 1.1. Eradications of rabbits from islands may be feasible, particularly if the risk of new arrivals can be mitigated against. The use of integrated and well-thought out management plans will be critical in such eradication programs to avoid unexpected consequences and to ensure their success.

Performance indicators


  • Regional priority areas for rabbit control are determined.

  • Rabbits maintained at or below threshold (0.5 rabbits per hectare) levels in identified priority areas.

  • Landscape scale control programs are implemented and monitored at regional levels.

  • Eradication of rabbits on islands is successful where this is attempted.



Action

Priority and timeframe

Outcome

Output

Responsibility

1.1. Prioritise areas on a regional scale (NRM, catchment level), including islands, for:

a) their conservation value

b) the potential for successful regeneration or rehabilitation of the species, and

c) the degree of threat from rabbits.

Undertake management action in these areas.

*Prioritisation should consider a range of factors (examples in the text above), including economic decision models.


High priority, short term

Key species and ecological communities are prioritised and protected from the impacts of rabbits.

Linkages made to recovery plans (where available).



List of priority areas.

Management actions undertaken with a measured reduction in the impact of rabbits on key species and ecological communities.




State governments, NRM and catchment groups.

Consultation should include local land managers and friends groups.



1.2. Continue to develop and implement cost effective and coordinated management programs across all land tenures, including urban areas.

High priority, medium term

Coordinated and targeted action by land managers.

Measurable recovery in threatened species and ecological communities.



Landscape scale management plans are adopted and implemented.

Rabbit numbers are reduced to less than 0.5 rabbits per hectare in priority areas.




State governments, NRM and catchment groups, land managers and friends groups

1.3. Create incentives for coordinated and strategic control across adjacent properties in all areas occupied by rabbits.

Medium priority, long term

Coordinated and strategic rabbit control resulting in slower reinvasion and more effective control.

Rabbit control is shared amongst adjoining land managers. Strategic control is undertaken across all adjoining land tenures.

State/territory governments and local councils

1.4. Develop regular and coordinated monitoring and reporting mechanisms at a regional and state scale to assess progress and apply adaptive management.

High priority, short, medium and long term (this will be an ongoing activity)

Land managers apply the most effective management actions to control rabbits.

Adaptive management practices are adopted and information is shared.

State governments, NRM and catchment groups, and land managers

1.5. Eradicate rabbits from identified islands

Very high priority, long term

Measurable recovery in threatened species and ecological communities on identified islands.

Rabbits are eradicated or under sustained control on high priority islands.

State/territory governments and land managers




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