Invasive species

5 important questions on Invasive species

What is an invasive species?

An invasive species is a non-native (or alien) species to the ecosystem under consideration. Its introduction likely causes:
  • Economic harm
  • Environmental harm
  • Harm to human health

What are the characteristics of invasive species?

  • They cause damage in their native range
  • Ecological flexibility
  • High fecundity
  • High longevity

What are the 3 hypotheses on why invasive species are successful?

Their habitat has:
  1. Better environmental attributes, such as increased resources
  2. Fewer or poorer competitors
  3. Release from natural enemies, such as predators and parasites.
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What are the measures for control of invasive species?

- Eradiction (uitroeiing)
  1. High ecological benefits
  2. Is it possible?
  3. Resistance by the general public?
- Lethal control
  1. Hunting
  2. Poisoning
  3. Trapping
- Fencing
- Introduction of diseases
- Fertility control

What are the 2 main categories of the GISS and the 6 sub categories for each of them?

Environmental impacts:
  1. On plant or vegetation
  2. On animals through predation, parasitism or intoxication
  3. On species through competition
  4. On native species through transmission of diseases or parasites
  5. Through hybridization
  6. On ecosystems

Socio-economic impacts:
  1. On agricultural production
  2. On animal production
  3. On forestry production
  4. On human infrastructure
  5. On human health
  6. On human social life

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