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Review of the management of feral animals and their impact on ...

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River. Buffalo invading <str<strong>on</strong>g>the</str<strong>on</strong>g> Victoria River Basin should also be eradicated before<br />

<str<strong>on</strong>g>the</str<strong>on</strong>g>ir numbers grow.<br />

Banteng numbers in Garig Gunak Barlu Nati<strong>on</strong>al Park <strong>on</strong> Coburg Peninsula have<br />

reached unsustainable numbers <str<strong>on</strong>g>and</str<strong>on</strong>g> a cull should be undertaken as a high priority<br />

(Secti<strong>on</strong> 7.1.4), especially in <str<strong>on</strong>g>the</str<strong>on</strong>g> wake <str<strong>on</strong>g>of</str<strong>on</strong>g> Cycl<strong>on</strong>e Ingrid which caused massive<br />

habitat damage.<br />

D<strong>on</strong>keys are very damaging <str<strong>on</strong>g>and</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g>ir numbers have been c<strong>on</strong>trolled in <str<strong>on</strong>g>the</str<strong>on</strong>g> past. High<br />

numbers remain occur <strong>on</strong> Jawoyn Aboriginal l<str<strong>on</strong>g>and</str<strong>on</strong>g>s, especially in <str<strong>on</strong>g>the</str<strong>on</strong>g> Beswick L<str<strong>on</strong>g>and</str<strong>on</strong>g><br />

Trust area (397 000 ha.) <str<strong>on</strong>g>and</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> Eva Valley L<str<strong>on</strong>g>and</str<strong>on</strong>g> Trust area (=Manyalluk, 174,000<br />

ha.). D<strong>on</strong>key numbers are also high in <str<strong>on</strong>g>the</str<strong>on</strong>g> Victoria River Basin, where <str<strong>on</strong>g>the</str<strong>on</strong>g>y are<br />

identified as <str<strong>on</strong>g>the</str<strong>on</strong>g> ‘major envir<strong>on</strong>mental issue’. Fur<str<strong>on</strong>g>the</str<strong>on</strong>g>r investment is needed to c<strong>on</strong>trol<br />

d<strong>on</strong>key numbers in <str<strong>on</strong>g>the</str<strong>on</strong>g>se areas.<br />

A widespread cull <str<strong>on</strong>g>of</str<strong>on</strong>g> camels is necessary in arid areas <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> state (Secti<strong>on</strong>s 3.7.12<br />

<str<strong>on</strong>g>and</str<strong>on</strong>g> 7.1.2). They are multiplying out <str<strong>on</strong>g>of</str<strong>on</strong>g> c<strong>on</strong>trol, <str<strong>on</strong>g>and</str<strong>on</strong>g> fouling <str<strong>on</strong>g>and</str<strong>on</strong>g> depleting outback<br />

water supplies <str<strong>on</strong>g>and</str<strong>on</strong>g> altering vegetati<strong>on</strong> structure. The Nor<str<strong>on</strong>g>the</str<strong>on</strong>g>rn Territory populati<strong>on</strong><br />

more than doubled between 1993 <str<strong>on</strong>g>and</str<strong>on</strong>g> 2001 <str<strong>on</strong>g>and</str<strong>on</strong>g>, if not c<strong>on</strong>trolled, will double again in<br />

about eight years (Edwards et al. 2003).<br />

Dingoes <str<strong>on</strong>g>and</str<strong>on</strong>g> dogs probably need c<strong>on</strong>trolling al<strong>on</strong>g <str<strong>on</strong>g>the</str<strong>on</strong>g> Nor<str<strong>on</strong>g>the</str<strong>on</strong>g>rn Territory coast east <str<strong>on</strong>g>of</str<strong>on</strong>g><br />

Darwin (R. Chatto pers. comm.). Ray Chatto <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> Nor<str<strong>on</strong>g>the</str<strong>on</strong>g>rn Territory Parks <str<strong>on</strong>g>and</str<strong>on</strong>g><br />

Wildlife Commissi<strong>on</strong> is preparing a report <strong>on</strong> this matter which may recommend dog<br />

c<strong>on</strong>trol at particularly important sites, nearly all <str<strong>on</strong>g>of</str<strong>on</strong>g> which occur <strong>on</strong> Indigenous l<str<strong>on</strong>g>and</str<strong>on</strong>g>s.<br />

More funding should be provided to Aboriginal communities to achieve better pest<br />

c<strong>on</strong>trol <strong>on</strong> <str<strong>on</strong>g>the</str<strong>on</strong>g>ir l<str<strong>on</strong>g>and</str<strong>on</strong>g>s, as outlined in detail in Secti<strong>on</strong> 7.2.1. The priority areas are in<br />

<str<strong>on</strong>g>the</str<strong>on</strong>g> nor<str<strong>on</strong>g>the</str<strong>on</strong>g>rn half <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> Nor<str<strong>on</strong>g>the</str<strong>on</strong>g>rn Territory, from <str<strong>on</strong>g>the</str<strong>on</strong>g> Victoria River Basin to <str<strong>on</strong>g>the</str<strong>on</strong>g> Top<br />

End <str<strong>on</strong>g>and</str<strong>on</strong>g> south to <str<strong>on</strong>g>the</str<strong>on</strong>g> Gulf Country, in regi<strong>on</strong>s where <str<strong>on</strong>g>the</str<strong>on</strong>g> rugged l<str<strong>on</strong>g>and</str<strong>on</strong>g>scape provides<br />

harborage for <str<strong>on</strong>g>feral</str<strong>on</strong>g> <str<strong>on</strong>g>animals</str<strong>on</strong>g> <str<strong>on</strong>g>and</str<strong>on</strong>g> limits access by <str<strong>on</strong>g>the</str<strong>on</strong>g> traditi<strong>on</strong>al owners.<br />

9.2 Gaps in <str<strong>on</strong>g>management</str<strong>on</strong>g> tools <str<strong>on</strong>g>and</str<strong>on</strong>g> priorities for investment<br />

Reducing n<strong>on</strong>-target <str<strong>on</strong>g>impact</str<strong>on</strong>g>s<br />

The majority <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>feral</str<strong>on</strong>g> <str<strong>on</strong>g>animals</str<strong>on</strong>g> in <str<strong>on</strong>g>the</str<strong>on</strong>g> rangel<str<strong>on</strong>g>and</str<strong>on</strong>g>s are c<strong>on</strong>trolled using a suite <str<strong>on</strong>g>of</str<strong>on</strong>g> similar<br />

techniques. These have been summarised in Secti<strong>on</strong> 5. However, many <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g>se<br />

c<strong>on</strong>trol techniques also have detrimental <str<strong>on</strong>g>impact</str<strong>on</strong>g>s <strong>on</strong> native wildlife <str<strong>on</strong>g>and</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g><br />

development <str<strong>on</strong>g>of</str<strong>on</strong>g> more species-specific c<strong>on</strong>trol techniques should be c<strong>on</strong>sidered a<br />

priority area for investment. It is also an area <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>feral</str<strong>on</strong>g> animal c<strong>on</strong>trol that holds great<br />

potential for improving c<strong>on</strong>trol effectiveness <str<strong>on</strong>g>and</str<strong>on</strong>g> efficiency.<br />

The geographical isolati<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> Australian c<strong>on</strong>tinent has allowed a unique range <str<strong>on</strong>g>of</str<strong>on</strong>g><br />

flora <str<strong>on</strong>g>and</str<strong>on</strong>g> fauna to develop in this country. Most <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> <str<strong>on</strong>g>feral</str<strong>on</strong>g> <str<strong>on</strong>g>animals</str<strong>on</strong>g> in <str<strong>on</strong>g>the</str<strong>on</strong>g> rangel<str<strong>on</strong>g>and</str<strong>on</strong>g>s<br />

are quite evoluti<strong>on</strong>arily distinct from native species <str<strong>on</strong>g>and</str<strong>on</strong>g> thus phylogenetic differences<br />

may provide physiological <str<strong>on</strong>g>and</str<strong>on</strong>g> behavioural differences that can be exploited. The<br />

‘Achilles heel’ approach is to look for <str<strong>on</strong>g>the</str<strong>on</strong>g>se biological differences <str<strong>on</strong>g>and</str<strong>on</strong>g> examine<br />

methods <str<strong>on</strong>g>of</str<strong>on</strong>g> exploiting <str<strong>on</strong>g>the</str<strong>on</strong>g>m to create more <str<strong>on</strong>g>feral</str<strong>on</strong>g>-animal specific c<strong>on</strong>trol techniques.<br />

The technique is most applicable to pois<strong>on</strong> baiting techniques where specific foraging<br />

behaviours or physiological tolerances to toxins can be exploited. As an example,<br />

when ground baiting with 1080 meat baits for foxes, baits are usually buried. In this<br />

instance, <str<strong>on</strong>g>the</str<strong>on</strong>g> Achilles heel <str<strong>on</strong>g>of</str<strong>on</strong>g> foxes is that <str<strong>on</strong>g>the</str<strong>on</strong>g>y will willingly dig for baits, whereas<br />

most native carnivores will <strong>on</strong>ly scavenge surface baits. This increases target<br />

specificity greatly, whilst affecting <str<strong>on</strong>g>the</str<strong>on</strong>g> effectiveness <str<strong>on</strong>g>of</str<strong>on</strong>g> ground baiting in a minimal<br />

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