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The impact of pest species over time
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A unique environment• Our unique plants & animals were isolated for
millions of years, evolving in the absence of people and mammalian predators.
• We have almost no native mammals (only some bats); our larger animal life is dominated by birds (over 300 species), lizards, frogs, wētā and land snails. Many of these have unusual characteristics.
Source: http://www.teara.govt.nz/
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How many?!!
• 25,000 plant species, 54 mammal species, and about 2,000 invertebrate species have been introduced here since human settlement[1].
[1] Source: Environment 2007 Report, Section 3 Biodiversity http://www.mfe.govt.nz/publications/ser/enz07-dec07/chapter-12.pdf
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Aotearoa-New Zealand
• “one of the world’s weediest countries” [1]
[1] Source: Landcare Research (2009); http://www.landcareresearch.co.nz/research/obi.asp?Proj_Collab_ID=14
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A problem!!
Do you know which is pampas grass & which is toetoe?
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The good & the bad• Animals –
some useful for agriculture BUT what if they go wild!?
• Plants – some useful for agriculture but others ….. impact on our native biodiversity
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Stoats & other mustelids
• DOC records, “(f)orty-four birds have become extinct since human colonisation brought pests, such as stoats, to New Zealand” [1].
[1] Source: Department of Conservation – Threats & Impacts: http://www.doc.govt.nz/publications/conservation/threats-and-impacts/biosecurity/devastating-immigrants/
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Distribution of selected pest animal and weed species (indicator 2.5).
• Source: Measuring New Zealand’s Progress Using a Sustainable Development Approach: 2008 Topic 2: Biodiversity from Stats NZ http://www.statistics.govt.nz/Publications/NationalAccounts/sustainable-development/biodiversity.aspx
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Views of appropriate management for introduced wildlife animals
Source: Fraser, A (2006) Public attitudes to pest control -A literature review
DOC research report http://www.doc.govt.nz/upload/documents/science-and-technical/drds227.pdf
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Perception of introduced wildlife as pest or resource
Source: Fraser, A (2006) Public attitudes to pest control -A literature review
DOC research report http://www.doc.govt.nz/upload/documents/science-and-technical/drds227.pdf
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To rid our country of these pest species we need to spend large
amounts of money
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imagine ….
All the humans have disappeared …. but all those pest species we
introduced still exist. Discuss what could be the plus, minus,
interesting factors of such a scenario for:• the environment of Canterbury?• the native plants & animals?• agricultural plants & animals?