Landscape modification

6 important questions on Landscape modification

In which type of landscapes are extinction cascades most likely to occur?

Landscapes with:
  • low native vegetation cover
  • low landscape connectivity
  • degraded native vegetation and intensive land use in modified areas, especially if keystone species or entire functional groups of species are lost.

What is landscape modification?

Modifying native vegetation.

What are the 2 main models to view pattern-oriented view?

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How do island biogeography work?

Continuous turnover of species.
  • the more species present, the less potential immigrants remaining
  • dispersal ability: species not yet present on the island are probably bad dispersers
  • the more species present, the larger the chance of a random extincition effect
  • competition: the more species present, the more engeative competitive interactions (competitive exclusion)

What is spatial grain?

The size of the spatial units relative to the total area.

What are the edge metrics?

  • Edge depth
  • Nr of nearby edges
  • Edge / Core ratio

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