Species distribution modelling

8 important questions on Species distribution modelling

What is a resource selection function?

Method to identify areas within landscapes that are occupied by population of plants or animals.
  • Species use certain habitats (resources) more often than other habitats. These habitats are probably important for survival.

What is a resource selection function?

Method to identify areas within landscapes that are occupied by population of plants or animals.
  • Species use certain habitats (resources) more often than other habitats. These habitats are probably important for survival.

How do you determine if a species is absent (0)?

  • Direct and indirect observations
  • Random points (excluding the locations where the species has been observed)
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What is the spatial bias?

You cannot sample the whole area.

What is the temporal bias?

Only few visits (during the day).

What is the Maximum Entropy Approach?

  • Presence-only data
  • Pseudo-absence data
  • Occurrence is location (X-coord, Y-coord)
  • Environmental variables from whole area

What is the input for MaxEnt?

  • Presence-only data (o)
  • (Random) background locations (pseudo-absences) (x)
  • Environmental variables from each location

What is the output from MaxEnt?

  • Relative probability of species in every location
  • Importance of environmental variables in explaining distribution

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