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15 Cards in this Set
- Front
- Back
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What are invasive species?
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They're exotics that displace natives
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What is the invasives rule of tens?
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- 10% of imported species will escape
- 10% of escaped species will establish - 10% of established species will become invasive pests |
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How do species invade?
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- may be natural of by humans
- via humans may be accidental escapees or hitchhikers - may be deliberate, for ornaments, pets, agriculture, fisheries, conservation or sport |
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What are the stages of invasion?
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-transport
-introduction -establishment -spread and displacement |
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How does disturbance aid invasion?
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Disturbance of an ecosystem increases the chance of species invasion.
fire can enhance invasion of non-native, fire tolerant species |
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How does overgrazing aid invasion?
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Import non native plant propagules into native vegetation
provide microsites for invasion |
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What factors help invasion?
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disturbance and overgrazing
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What are traits of successful invaders?
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-widespread
-abundant -dietary generalist -short generation time -tolerant of extremes |
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What happened with the cane toad in relation to invasion?
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They were introduced to Autralia to help control beetle pests on sugar cane but they did not control the beetles. They actually had a negative effect on native fauna.
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What are the population control methods?
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- corrective
- removal of individuals identified perpetrating problem - preventative - removal of problem species or lowering of density prior to potential problem |
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What is the key factor behind action of population control methods?
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Public perception
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What is lethal control?
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- Shooting or overdose tranquilizing
- Poisons - Pesticides |
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What are the qualities of the most commonly used control methods?
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- effective
- cheap - non-discriminatory |
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What is the problem with contraception?
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- slow to impact population if implemented when density close to K
- effective when population at low density - expensive |
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How is translocation as control?
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- non-lethal
- expensive and success rate varies |
