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Module 4

Module 4. Fighting back!. Learning Outcomes. At the end of this module you should be able to: identify and understand IAS management goals state some examples of successful eradications understand that IAS can be successfully eradicated or controlled. Fighting Back!.

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Module 4

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  1. Module 4 Fighting back!

  2. Learning Outcomes • At the end of this module you should be able to: • identify and understand IAS management goals • state some examples of successful eradications • understand that IAS can be successfully eradicated or controlled

  3. Fighting Back! • The worldwide problem of IAS is serious BUT the outlook is not all doom and gloom! • Around the world people are fighting back against unwanted invaders

  4. Red Imported Fire Ant What are the goals of IAS management? • There are four options: • Prevention • Early detection & rapid response • Eradication • Control / Mitigation

  5. Why manage IAS? • Must have specific goals, such as: • protecting an endangered species • conserving biodiversity • protecting human health

  6. Campbell Island teal Ship loading rat bait Eradication • Campbell Island • an 11,000 hectare sub-Antarctic island infested with 200,000 rats • eradication necessary to protect rare native wildlife • completed using 120 tonnes of rat bait dropped by helicopter • the largest island eradication of rodents

  7. Increasing size of New Zealand islands from which rats have been eradicated Eradication • Eradication of IAS on large islands is now possible due to: • better techniques • improved technology • years of experience

  8. After Before Control • Lake Wilson, Hawaii • invaded by the aquatic weed Salvinia molesta • multi-agency task force set up to address the problem • used herbicide and mechanical removal to clear 38,000 m³ of weed from lake • requires monthly maintenance to prevent regrowth

  9. metal barrier on trunk Mitigation • Possum browsing • threatens rare native New Zealand mistletoe plants • individual trees are ‘tinned’ to prevent possums from climbing them

  10. The way forward • Eradication is now an achievable goal in many situations • Often more than one species can be eradicated at a time • Getting institutional buy-in is important

  11. Summary • Apathy is not an option! • Techniques & resources for eradication are constantly improving • There are numerous success stories from around the world • Eradication is hard work but the results are worth it!

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