Slipper Limpet

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Slipper Limpet

• Alien from North America

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General information
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Observations
on slipper limpets in the intertidal (1,2) and
subtidal (3,4) zone
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Observations
percentage
number of individuals per stack ( of size class)
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Model
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Probability of death
Probability
Time (years)
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Probability of birth
Probability
Concentration
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Reference density
This parameter shows how good conditions for
slipper limpet population growth are. We have no
idea how to evaluate this parameter, but we can
run our model with different values of reference
density and check wether it will be qualitative
changing.
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Model results

• For large values of the reference density
• Spectrum has a limit (in mathematical meaning).
  Population dies but it is not a linear process.

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Model results

• For small values of the reference density
• We have a movement of the spectrum maximum with
  the model time steps.

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Conclusions

• If we have a situation when low-number clusters
  prevail it means that the population is in early
  colonization phase or is in decline.
• If we see the spectrum maximum shift to the
  higher-number clusters it means that the
  conditions are persistently good for population.
• Theoretically, it is possible to determine by
  spectrum evolution whether conditions are good
  for slipper limpets or not.

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Thank you for your attention